HP L1940,EJ6B50 Service Manual

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Page 1

Horizontal frequencies

30-83kHz

Service

TABLE OF CONTENTS

Published by BCU Monitors Printed in Suzhou Copyright reserved Subject to modification K Oct. 15 2004

Description Page Important Safety Notice---- ------------------------------ 2 Technical Data ------------------------------------------3~4

Warning Message------------------------------------------7 Lock/unlock,Aging,Service/Factory mode------------8

Definition of pixel defects-------------------------------12

Instalation/On Screen Display------------------------5~6

Flat panel adjust--------------------------------------------9 Mechanical Instructions----------------------------10~11

Electrical instruction--------------------------------13~14 DDC Instructions-------------------------------------15~21 Failure mode of panel------------------------------------22 Safety Test Requirments--------------------------------23 ISP CABLE FOR CPU-------------------------------24~26

Description Page Repair tips ------------------------------------------------27 Color adjustment----------------------------------------28 Repair Flow chart/Trouble shooting-------------29~32 Block Diagram---------------------------------------33~34

Control Diagram & C.B.A.------------------------------43 Power Diagram & C.B.A.--------------------------44~47 Exploded View------------------------------------------- 48 Spare/recommended parts list------------------49~50 General product specification--------------------51~78 DDC DATA -------------------------------------------79~80 Different parts list----------------------------------------81

Scaler Diagram&C.B.A.---------------------------36~42

Wiring Diagram -----------------------------------------35

REFER TO BACK COVER FOR IMPORTANT SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING.

ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.

SAFETY NOTICE

SH4 HP L1940

3138 106 10428

19" LCD Colour Monitor

EJ6B50/02 EJ6B50/69 EJ6B50/76

Page 2

Important Safety Notice

HP L1940

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Proper service and repair isimportant to the safe, reliable

operation of all HPConsumer Electronics Company**

Equipment. The service procedures recommended by HP and

described in this service manual are effective methods of

performing service operations. Some ofthese service

operations require the use of tools specially designed for the

purpose. The special tools should be used when and as

recommended.

It is important to note that this manual contains various

CAUTIONS and NOTICES which should be carefully read in

order to minimize the risk of personal injury to service

personnel. The possibility exists that improper service

methods may damage the equipment. It is also important to

understand that these CAUTIONS and NOTICES ARE NOT

EXHAUSTIVE. HP could not possibly know, evaluate and

advise the service trade of all conceivable ways in which

service might be done or of the possible hazardous

consequences of each way. Consequently, HP has not

undertaken any such broad evaluation. Accordingly, a

servicer who uses a service procedure or tool which is not

recommended by HP must first satisfy himself thoroughly that

neither his safety nor the safe operation of the equipment will

be jeopardized by the service method selected.

* * Hereafter throughout this manual, HP Consumer

Electronics Company will bereferred to as HP.

Critical components having special safety characteristics are

identified with a bythe Ref. No. inthe parts list and

enclosed within a broken line*

(where several critical components are grouped in one area)

along with the safety symbol on the schematics or

exploded views.

Use of substitute replacement parts which do not have the

same specified safety characteristics may create shock, fire,

or other hazards.

Under no circumstances should the original design be

modified or altered without written permission from Philips.

Philips assumes no liability, express or implied, arising out of

any unauthorized modification of design.

Servicer assumes all liability.

* Broken Line

WARNING

Take care during handling the LCD module with backlight

unit

- Must mount the moduleusing mounting holes arranged infour

corners.

- Do not press onthe panel, edge of theframe strongly or electric

shock as this will result in damage to the screen.

- Do not scratch orpress on the panel withany sharp objects, such

as pencil or pen asthis may result in damage to the panel.

- Protect the module fromthe ESD as it maydamage the electronic

circuit (C-MOS).

- Make certain that treatment person s body are grounded through

wrist band.

- Do not leave themodule in high temperature andin areas of high

humidity for a long time.

- Avoid contact with water as it may ashort circuit within the module.

- If the surface ofpanel become dirty, please wipe it off with a soft

material. (Cleaning with a dirty or rough cloth may damage the

panel.)

FOR PRODUCTS CONTAINING LASER :

DANGER- Invisible laser radiation when open.

AVOID DIRECT EXPOSURE TO BEAM.

CAUTION- Use of controls or adjustments or

performance of procedures other than

those specified herein may result in

hazardous radiation exposure.

CAUTION- The use of optical instruments with this

product will increase eye hazard.

TO ENSURE THE CONTINUED RELIABILITY OF THIS

PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S

REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART

NUMBERS IN THE PARTS LIST SECTION OF THIS

SERVICE MANUAL.

Page 3

Technical Data

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HP L1940

Pin Assignment

Input DVI-D connector pin

LCD Panel

Type NR. :LM190E02_A5 (LPL) Numberof Pixels. : 1280 (H) x 1024 (V) Physical Size. : 404.2(H)*330.0(V)*20.0(D)mm Pixel Pitch. : 0.294 x 0.294 mm Color pixel arrangement. : RGB stripes arrangement SupportColor. : 8 bit (16.7M Colors) Display Mode. : Transmissive Mode,Normally Black Backlight. : CCFL edge light system Active area. (WxH). : 376.32(H) x 301.056(V)mm (19

diagonal)

Viewing Angle. : Vertical 176 degree, Horizontal 176 degree

(CR=10) Contrast ratio. : 500:1 Luminance. : 250 cd/m

(Typ)

Scanning frequencies H-Frequency. : 30K - 83 K Hz V-Frequency. : 56 - 76 Hz

Power input. : 90-265 V AC, 50/60 ± 2Hz Power input. : 90-265 V AC, 50/60 ± 2Hz

The inputsignalscan be applied in two different modes:

1). VESA Analog

The video input consists of red, green, and blue signals. The video

signals areanalog levels, where0Vcorr

esponds to black and 700mV is

the maximumsignalamplitude. Inputimpedance ofvideopinsis75ohm

+- 1%. The VESA VSISspecification states the video voltages shall be 700 mV +10%/-5% with

12% for the overshoot. The apability of sync

signal inputs shall include separate sync.inputimpedance: 2k2 ohms The

signals are defined as follow:

Separate sync 3.3V and5volt TTL level ,Positive/Negative

2). Intel DVI Digital Inputsignal:Four channel TMDS signals. The digital interfaceshall

be comprised of2electrical layercomponent: a TMDSinterfacefor low-

oltage differential serial encoding of the digital display data(Panel Link

compliant) and a DDC2B electrical interface. Refer to the Digital Display

Working Group(DDWG) document,

Digital Visual Interface(DVI)

Specification, Revision1.0

for the exact requirements.

Unit dimension / Weight

Set dimension(incl. pedestal) : 413(W) * 477(H) * 265(D)mm

Net weight. : 8.4 kg

Tilt and swivel base

Basic base: tilt angle : -5 ° to +35 ° ( operation)

swivel rotation:± 90°

Shipping dimension/Weight

Carton dimension. : 524(W) * 239(D) * 513(H) mm

Gross weight. : 10 Kg

Susceptibility ofdisplay to external environment

Temperature Ranges

Operating Temperature(Independent of altitude) : 5°Ct

o 35°C.

Non-Operating Temperature(Independent of altitude) : -20°Cto 60°C.

Humidity

Operating (non-condensing) : 20% to 80%

Non-Operating (38.7°Cmaximumwetbulb temperature) : 5% to 90%

Altitude

Operating 0 to 12,000 feet [3,658 m].Equivalent to 14.7 to 10.1 psia. Non-Operating0to 40,000 feet [12,192 m]. Eq

uivalent to 14.7 to 4.4 psia

Red video input

Green video input

Blue video input

GND

Cable detect

Red video GND

Green video GND

Blue video GND

DDC +3.3V OR +5V

GND

Serial data line (SDA)

H-sync

V-sync

Data clock line (SCL)

9 10

Pin No.

Assignment

Pin No. Description

1T.M.D.S data2- 2T.M.D.S data2+ 3T.M.D.S data2 shield 4Noconnect 5Noconnect 6 DDC clock 7 DDCdata 8Noconnect

9T.M.D.S data110 T.M.D.S data1+ 11 T.M.D.S data1 shield 12 Noconnect 13 Noconnect 14 +5Vpower 15 Ground (for +3.3V)-Cable detect 16 Hot plug detect 17 T.M.D.S data018 T.M.D.S data0+ 19 T.M.D.S data0 shield 20 Noconnect 21 Noconnect 22 T.M.D.S clockshield 23 T.M.D.S clock+ 24 T.M.D.S clock-

Page 4

Technical Data(Continued)

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This monitor is ENERGY STAR compliant.

this product meets the ENERGY STAR guidelines for energy

Data Storage

Efficiency

ENERGY STAR is a U.S. registered mark. AS AN ENERGY STAR

PARTNER, DELL Computer Corporation HAS DETERMINED THAT

THIS PRODUCT MEETS THE ENERGY STAR GUIDELINES FOR

ENERGY EFFICIENCY.

HP L1940

Power management

The power consumption and the status indication of the set with power management function are as follows,

STATUS H-sync V-sync Video Power LED indicator

On On On Active < 70W

Green LCD

(*Note1)

Stand-by Off On Blanked < 2W

Amber LCD

(*Note2)

Suspend On Off Blanked < 2W

Amber LCD

(*Note2)

Off Off Off Blanked < 2W

Amber LCD

(*Note2)

DC Switch off N/A N/A N / A < 1W Off (*Note 2)

Note 1: Included two active external USB devices Note 2: Measurement is required to connect PC via USB 2.0 upstream cable and be

without any external USB devices. The operating system is required to be Windows XP , and USB interface of PC shall conform to USB 2.0 compliance.

Display identification Analog DDC In accordance with VESA Display Channel Standard V1.0 and having DDC-2B capability. Digital DDC In accordance with DVI requirement (DDWG digital Visual Interface revision 1.0) use DDC-2B

and EDID 3.0 structure 2.0

Factory preset modes (15 modes)

# Resolution H-Frequency

(Hz)

Pixel rate

(MHz)

V-Frequency

(Hz)

Comment

1 640X480 31.469K 25.175 59.940 VGA

2 640X480 37.861K 31.5 72.809 VESA

3 640X480 37.5K 31.501 75 VESA

4 720X400 31.469K 28.322 70.087 VGA

5 800X600 37.879K 40 60.317 VESA

6 800X600 48.077K 50 72.188Hz VESA

7 800X600 46.875K 49.498 75Hz VESA

8 832X624 49.726K 57.284 74.551Hz MAC

9 1024X768 48.363K 65 60.004Hz VESA

10 1024X768 56.476K 75 70.069Hz VESA

11 1024X768 60.023K 78.75 75.029Hz VESA

12 1152X870 68.68K 100 75.06Hz MAC

13 1152X900 71.71K 108 76.05Hz SUN

14 1280X1024 63.98K 108 60.02Hz VESA

15 1280X1024 79.97K 135 75.02Hz VESA

Page 5

Installation

HP L1940

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Connecting to PC

When two computers are connected, you will need to set the Video Input Select on the on-screen display (OSD) menu to specify which monitor input has priority.

1. Place the monitor in a convenient, well-ventilated location Near your computer.

2. Connect the monitor signal cable into the correct video connector (VGA or DVI-D) on the back of the monitor and into the corresponding video connector on the rear panel of the computer.

Your computer must have a DVI -compatible graphics card installed for use with the DVI-D cable. When connecting the DVI-D signal cable to the DVI connector on the monitor, connect the other end of the DVI-D cable to the DVI connector on the Computer.

3. Connect one end of the power cable to the back of the monitor, and the other end to an electrical wall outlet.

Warnning:To reduce the risk of electric shock or damage to your equipment:

1. Do not disable the power cord grounding plug. The grounding plug is an important safety feature.

2. Plug the power cord into a grounded (earthed) electrical outlet that is easily accessible at all times.

3. Disconnect power from the monitor by unplugging the power cord from the electrical outlet.

Front control panel

Identifying Rear Panel Components

4 5

No. Component Function

AC power connector

Connects the AC power cord to the monitor.

USB downstream connectors

Connects optional USB devices to the monitor.

USB upstream Connects the USB cable to the host (computer

connector or another USB hub).

DVI connector

(available on

select models)

Connects the DVI-D signal cable to the monitor.

VGA connector Connects the VGA cable to the monitor.

4. Do not place anything on power cords or cables. Arrange them so that no one may accidentally step on or trip over them. Do not pull on a cord or cable. When unplugging from the electrical outlet, grasp the cord by the plug.

No. Component Function

Auto Adjust

Activates the auto adjustment feature for optimum image.

Opens the On-Screen Display (OSD) menu.

-(Minus)

If OSD is on, press to navigate backward through the OSD menu features and decrease adjustment levels.

If OSD is off, press to enable the DVI

signal input(available on select models)

+ (Plus)

If OSD is on, press to navigate forward through the OSD menu features and increase adjustment levels.

If OSD is off, press to enable the VGA signal input.

Power

Turns the monitor on or off.

Page 6

On Screen Display

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HP L1940

Advanced osd service mode configuration

Analog Mode Menu

Menu Level 1 Menu Level 2

Brightness ADJ Scale

Contrast ADJ Scale

Auto Adjustment

(

Adjusting message)

Advanced Menu

Exit

Digital Mode Menu

Menu Level 1 Menu Level 2

Brightness ADJ Scale

Contrast ADJ Scale

Advanced Menu

Exit

Analog Mode Menu

Menu Level 1 Menu Level 2 M enu Level 3 Factory Reset?

Brightness ADJ Scale Y (FP=90)

Contrast ADJ Scale Y (FD=80)

Image Control Auto Adjustment

(

Adjusting

message)

Y(noFD)

Horizontal Position ADJ Scale Y ( noFD )

Vertical Position ADJ Scale Y (no FD)

Clock ADJ Scale Y (no FD)

Clock Phase ADJ Scale Y (no FD)

Cancel

Save and Return

Color 9300 K

6500 K Y(FD)

Custom Color Custom Color

ADJ

sRGB

Cancel

Save and Return

Service Display Hours N

Reset Total Hours Confirm Reset N

Reset Backlight Hours Confirm Reset N

Copy All Settings Confirm Reset N

Recall All Settings Confirm Reset N

Display White Block N

Unlock EDID Write

Cancel N

Save and Return N

Management Power Saver On / Off

Selection

N(FD=ON)

Power On Recall On / Off

Selection

N(FD=ON)

Mode Display On / Off

Selection

N (FD=OFF)

Power-On Status

Display

On / Off

Selection

N(FD=ON)

Sleep Timer Timer Set Menu N (FD=0;OFF)

Default Video Input -Analog - VGA N(FD=DVI)

-Digital - DVI

Serial Number Display monitor

s/n

Basic Menu N(FD=Basic)

Cancel

Save and Return

OSD Control Horizontal OSD Position ADJ Scale N (FD=50)

Vertical OSD Position ADJ Scale N (FD=50)

OSD Timeout ADJ Scale N (FD=30)

Cancel

Save and Return

Information Current Settings:

Recommended Settings:

Serial Number:

Total Hours:

Backlight Hours:

Exit

Factory Reset Yes

Exit

Digital Mode Menu

Menu Level 1 Menu Level 2 Menu Level 3 Factory Reset?

Brightness ADJ Scale Y (FP=90)

Contrast ADJ Scale Y (FD= 80)

Color 9300 K

6500 K Y(FD)

Custom Color CustomC olor

ADJ

sRGB

Cancel

Save and Return

Service Display Hours

Reset Total Hours Confirm Reset N

Reset Backlight Hours Confirm Reset N

Copy All Settings Confirm Reset N

Recall All Settings Confirm Reset N

Display White Block N

Unlock EDID Write

Cancel

Save and Return

Management Power Saver On / Off

Selection

N(FD=ON)

Power On Recall On / Off

Selection

N(FD=ON)

Mode Display On / Off

Selection

N(FD=OFF)

Power-On Status

Display

On / Off

Selection

N(FD=ON)

Sleep Timer Timer Set Menu N (FD= 0;OFF)

Default Video Input -Analog - VGA N (FD = DVI)

-Digital - DVI

Serial Number Display monitor

s/n

Basic Menu N(FD=Basic)

Cancel

Save and Return

OSD Control Horizontal OSD Position ADJ Scale N (FD=50)

Vertical OSD Position ADJ Scale N (FD=50)

OSD Timeout ADJ Scale N (FD=30)

Cancel

Save and Return

Information Current Settings:

Recommended Settings:

Serial Number:

Total Hours:

Backlight Hours:

Exit

Factory Reset Yes

Exit

basic osd menu levels

Page 7

Warning Message

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HP L1940

Warning Message Table

Item Attention Signals Display Time Condition

1 Input Signal out of Range See power savertable

2 No Input Signal See power savertable

3 Going to Sleep See power savertable

4 Adjusting...... Auto key or OSD menu function

5 OSD Lock out 3secs Push menu key for 10 sec then display 3 sec WM OSD

Lock out

7 Status AC/DC on and "Power-On Status Display is on

Check Video Cable

10secs

See power savertable

Power Saver Table

Power Saver - On Power Saver - Off Note

Quit signal with

cable

1. System blank and show WM

"Going to Sleep" 3 sec then sleep.

1. System blank and show moving

WM "No Input Signal"always.

Disconnect cable 1. System blank and show WM

"Check Video Cable"60 sec.

1. System blank and show WM

"Check Video Cable" 10

2.Show WM "Going to Sleep" 3 sec

then sleep.

then repeat item 1 to 2.

sec then moving always.

Out of range - 1 1. System blank and show WM

"Check Video Cable" 20 sec then

moving about 30 sec After moving

3. If push any key in sleep mode, then repeat item 1to 2.

1. System blank and show moving

WM"In Put Signal out of Range"

always.

H<29.5 or

H>92 or

90>H>82.5 or

V<49 or V>87

or Vtotal>=120

Out of range - 2 1. Show moving WM"Input Signal

out of Range" always.

85Hz

3. If push any key in sleep mode,

WM 50 sec.

2. The backlit turn off.

1. System blank and show WM

"Check Video Cable" 20 sec then

moving about 30 sec After moving

3. If push any key in sleep mode, then repeat item 1to 2.

WM 50 sec.

2. The backlit turn off.

Page 8

Lock/Unlock,Aging, Service/Factory Mode

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HP L1940

Front control panel

To Lock/Unlock OSD function

AGING MODE No signal input ,power off -> on ,then Into the factorymode,,a full white pattern will be display on the screen as Fig.1&Fig.2 in stead of power savingmode.Inother words, thepower savingfunction will be disable inthe

factorymode.Supply one signal for leaving agingmode.

SERVICE MODE Press andhold the "Menu"

button ,power off -> on"Power"

,then

Into the service mode.Press "Menu"

button to bringup OSD

menufor confirmation asbelow:

Access FactoryMode

Factorymenu Cursor can moveongray color area

BL : Blacklevel value

SUB-BRI : Brightness value range(Min Max)

SUB-CON : Contrast value range(Min Mid Max)

SRGB-B : Brightness of sRGB(Reserved)

SRGB-C : Contrastof sRGB(Reserved)

AUTO-SUB: To do Auto color function when

push "Up"keyin white pattern

Panel Type:Ifset this to 1,2,3,4,5 then system

ll force panel type to LG(QDI), CPT orAU).

Set to other value will auto detect panel based on

panel hardware.

SCALER : Read/Write scaler register

NVRAM : Read/Write eeprom address

Auto Adjust

-(Minus)

+(Pl us)

Pow er

OSD LockThe OSD can beenabled or disabledbypressing and holding the Menubutton on the front panel for 10 seconds. If the

OSD is locked, the warningmessage "OSD Lock" displays for

ten s econds.

If t he OSD is locke d, press andhold the Menubutton for 10

econds to unlock the OSD.

If t he OSDisunlocked, press andhold th e Menubutton for 10

seconds to lock th e OSD.

1). Turn off monitor.

2). [Push "Auto Adjust " and "+(plus)"andhold them at the same time ]+[Press power "Power " button untill comes out "Windows

screen"] => then release all button,

then press "Menu" button,wait until

the OSD menuwithCharacters"F"

(right OSD menu) comeonthe

Screen of the monitor

Fig.1

Fig.2

Page 9

Flat Panel Adjust

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HP ADJUSTMENT PATTERN.EXE

VERSION: 2.00 Rev A

OPERATING SYSTEM(S): Microsoft Windows 98 Microsoft Windows Millennium Edition (ME) Microsoft Windows 2000 Microsoft Windows XP 32-bit Personal Microsoft Windows XP 32-bit Professional

DESCRIPTION: This CD contains the HP Auto-Adjustment utility, which is a

single pattern program designed to help improve the picture quality of your HP flat panel monitor.

Note: Do not use the following procedure if your flat panel monitor is using a

DVI connector option.

To use the Adjustment pattern with your flat panel monitor:

1. Execute the auto-adjust function from the OSD main menu.

2. If the result is not satisfactory, start the "Adjustment pattern.exe" program and repeat step 1.

Image quality characteristics that can be improved:

- Fuzzy or unclear focus

- Ghosting, streaking or shadowing effects

- Faint vertical bars

- Thin horizontal scrolling lines

- Centering the picture

Note: To achieve optimal picture performance, it is recommended that you always set the operating system display mode to your flat panel's native resolution. See list below for reference. 14in. and 15in. flat panels = 1024x768 17in., 18in. and 19in. flat panels = 1280x1024 20in. and 21in. flat panels = 1600x1200

HP L1940

Page 10

Mechanical Instruction

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HP L1940

Front view

Back view

Step 1. Remove the stand.

Remove the four screws as Fig.3

Fig.3

Fig.4

Fig.2

Fig.1

Step 2. Remove the Back cover as Fig.5~8.

b. Use thin "I" type screwdriver to open 4 clicks on bottom side as Fig.5

Remove the four screws on the left and right sides as Fig.4

Use thin "I" type screwdriver to open 3 clicks on right

side as Fig.6

e. Use thin "I" type screwdriver to open 3 clicks on left side as Fig.7

f. Remove the front cover as Fig.8

g. Remove the back cover as Fig.9 ,then remove the 8 screws

Fig.5

Fig.6

Fig.7

Fig.8

Step 3. Remove the Scaler and Power board.

Remove the 9 screws and disconnect the 7 cables as Fig. 10

Fig.9

Fig. 10

Page 11

Mechanical Instruction

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HP L1940

Step 4. Disconnect the control PCB,

as Fig.11

the scaler pcb and power pcb

Fig.11

Fig.12

Step 5 Remove the MAIN SHIELD ASSY as

FIG.12

In warranty, it is not allowed to disassembly the LCD panel, even the

backlight unit defect.

Out of warranty, the replacment of backlight unit is a correct way

when the defect is cused by backlight (CCFL,Lamp).

LPL panel

Page 12

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LCD Monitor Quality and Pixel Policy

The TFT monitor uses high-precision technology, manufactured according to HP standards, to guarantee

trouble-free performance. Nevertheless, the display may have cosmetic imperfections that appear as small

bright or dark spots.

This is common to all LCD displays used in products supplied by all vendors and is not specific to the HP LCD.

These imperfections are caused by one or more defective pixels or sub-pixels.

1. A pixel consists of one red, one green, and one blue sub-pixel.

2. A defective whole pixel is always turned on (a bright spot on a dark background), or it is always off (a dark spot

on a bright background). The first is the more visible of the two.3. A defective sub-pixel (dot defect) is less

2. visible than a defective whole pixeland is small and only visible on a specific background.The HP display does

not have more than:

4. bright dots.

5. dark dots.

6. total bright and dark dots.

7. No more than two adjacent (less than 2.5 mm edge-to-edge) defective pixels. To locate defective pixels, the monitor

should be viewed under normal operating conditions, in normal operating mode at a supported resolution and

refresh rate, from a distance of approximately 50 cm (16 in.).HP expects that, over time, the industry will continue to

improve its ability to produce LCDs with fewer cosmetic imperfections And HP will adjust guidelines as

improvements are made.

Definition of Pixel Defects

HP L1940

Page 13

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Electrical Instructions

PRESETVIDEORESOLUTION

HP L1940

2.3 Allowed85Hzoverscan signal modespecifiedOnce thesignal sync input ofPCis 85Hz, this monitor is able to display at least for 60 seconds.An attention signal appears and showsInput Signal Out Of Range for 60 seconds ,changecomputer display input to 1280X1024 @ 60 Hz.

(MHz)

H. Freq (KHz)

Mode Resolution V. F req

(Hz)

36.000 43.269 VESA 640 * 480 85.008

556.250 53.674 VESA 800 * 600 85.061

94.500 68.677 VESA 1024 * 768

84.997

157.5 91.146 VESA 1280 * 1024

85.024

#Resolution

H-Frequency (Hz)

Pixel

rate

(MHz)

V-Frequency (Hz)

Comment

1 640X480 31.469K 25.175 59.940 VGA

2 640X480 37.861K 31.5 72.809 VESA

3 640X480 37.5K 31.501 75 VESA

4 720X400 31.469K 28.322 70.087 VGA

5 800X600 37.879K 40 60.317 VESA

6 800X600 48.077K 50 72.188Hz VESA

7 800X600 46.875K 49.498 75Hz VESA

8 832X624 49.726K 57.284 74.551Hz MAC

9 1024X768 48.363K 65 60.004Hz VESA

10 1024X768 56.476K 75 70.069Hz VESA

11 1024X768 60.023K 78.75 75.029Hz VESA

12 1152X870 68.68K 100 75.06Hz MAC

13 1152X900 71.71K 108 76.05Hz SUN

14 1280X1024 63.98K 108 60.02Hz VESA

15 1280X1024 79.97K 135 75.02Hz VESA

2.4 Interface

2.4.1 Analog signal

Theinput signals are applied to display through D-sub cable. Length: 1.8 M +/- 50 mm (fixed) Connector type:D-submale. With DDC_2B pin assignments. White connector thumb-operatedjack screws

1. Gen eral points

1.1 During thetestandmeasuring, supply a distortion free AC mains voltagetotheapparatus via an isolated transformer with low internal resistance.

1.2 All measurements mentionedhereafter are carried out at a normal mains voltage (90 - 132 VAC for USA version,195-264VACfor EUROPEAN version, or 90 - 265 VAC for the model withfull range power supply, unless otherwise stated.)

1.3 All voltages are to be measured or appliedwith respect to ground, unless otherwise stated. Note:don‘tuseheat-sink as ground.

1.4 Thetesthas to be done on a complete set including LCD panel after 30 minutes warm-up at least in a room with temperature of25+/-5degree C.

1.5 All values mentioned in these test instruction are only

app

licable of a well aligned apparatus with correct

signal.

1.6 The letters symbols (B) and(S)placedbehind thetest

instruction denotes

(B): carried out 100% inspection at assembly line (S): carried out test by sampling

1.7 The white balance (color temperature)has to betested in subdued lighted room.

1.8 Repetitive power on / off cy

cle are allowed exceptit

shouldbeavoidedwithin 6 sec.

2. Input signal

2.1 Input Signal Input Definition

2.1.1 Video signal input Signal source:pattern generator format as Table1 and

Table2. Reference generator:QuantumData 802G

Theinput signals can beapplied in two different modes:

1). VESA Analog The video input consists of red, green, andblue

signals.The video signals are analog levels,where 0V correspondstoblack and700mVis the maximum signal amplitude. Input impedance ofvideo pins is 75 ohm +/- 1%.

2). Intel DVI Digital

Input signal:Four channel TMDS signals.The digital interface shall becomprised of2

electrical layer

component: a TMDS interface for low-voltage

differential serial encoding of the digital display data(Panel Link compliant) and a DDC2B electrical interface.Refer to the Digital DisplayWorking Group(DDWG) document,

Digital Visual

Interface(DVI)Specification,Revision 1.0

for the

exact requirements.

2.1.2 Sync signal input Thecapability of sync signal inputs shall includeseparate sync. Input impedance:2k2ohms Thesignals are defined as follow:

Separate sync:3.3Vand5volt TTL level,

Positive/Negative

Signal source:Pattern generator

format as Table1 and

Table2Reference generator:QuantumData 802G

2.2 Input signal mode for Preset 15 modes

Pixel rate

Page 14

2.4.2 Digital signal

The input signals are applied to display through DVI-D cable.

Length: 1.8 M +/-50 mm (fixed) Connector type: DVI-D male With DDC_2B pin assignments. White connector thumb-operated jack screws Panel Link T.M.D.S input.

Pin assignment:

9300°K 6500°K-sRGB

x (center)

0.283 ± 0.020 0.313 ± 0.020

y (center) 0.297 ± 0.020 0.329 ± 0.020

Use Minolta CA-110 for color coordinates and luminance check.

Luminance is > 200 Nits in the center of the screen when brightness at 100% and contrast set to 100% at custom color (R,G,B=100%).

Electrical Instructions

Pin No. Description

1 T.M.D.S data22 T.M.D.S data2+ 3 T.M.D.S data2 shield 4 No connect 5 No connect 6 DDC clock 7 DDC data 8 No connect

9 T.M.D.S data110 T.M.D.S data1+ 11 T.M.D.S data 1 shield 12 No connect 13 No connect 14 +5V power 15

Ground (for +3.3V)

-cable detect 16 Hot plug detect 17 T.M.D.S data018 T.M.D.S data0+ 19 T.M.D.S data0 shield 20 No connect 21 No connect 22 T.M.D.S clock shield 23 T.M.D.S clock+ 24 T.M.D.S clock-

Set AC input at 264V / 90 V, add

2.6A loading to 12V O/P and DC O/P voltage is 12V +/- 1.2V,

1A loading to 3.3V O/P and DC O/P voltage is 3.3V +/- 0.165V,

1.5A loading to 5V O/P and DC O/P voltage is 5V +/- 0.5V.

HP L1940

4.5 EEPROM presetting (B)

After finishing all the adjustment, set:

1. Menu = Basic

2. Color = 6500K-sRGB

3. Language = English

4. Power Saver = ON

5. Power On Recall = ON

6. Mode Display = OFF

7. Horizontal OSD Position = 50%

8. Vertical OSD Position = 50%

9. OSD Timeout = 30

10. Sleep Timer = OFF

11. OSD Transparency = 0

12. Brightness = 90%

13. Contrast = 80%

4.6 When adjustment is finished, monitor should be set to 6500K-sRGB color.

4.7 The monitor shall leave the factory with the Power switch set to the OFF position

Go to cover page

3.POWER SUPPLY

4. DISPLAY ADJUSTMENT

4.1Access to factory mode (RS232) in auto-alignment system

The communication protocol switch to RS232 .

4.2 Auto color adjustment (B)

Apply a 640*480/31.47kHz/60Hz.signal with 16-gray

level pattern, set brightness control at 90%, and contrast

control at 80%. Then, adjust the R. G. B offset, and gain

to calibrate the color smoothly and 64-gray level

distinguishable at 1280*1024/63.98kHz/60Hz.

4.3 Adjustment of WHITE-D (B)

Apply a 1280*1024 / 60Hz signal with white pattern,

set brightness control at 90%, and contrast control at 80%.

Adjust the R, G, B Sub-Gain, for the screen center, the 1931 CIE chromaticity (X, Y) co -ordinates shall be;

Page 15

DDC Instructions

Pin No. Description

1 T.M.D.S. data2-

2 T.M.D.S. data2+

3 T.M.D.S. data2 shield

4 No Connect

5 No Connect

6 DDC clock

7 DDC data

8 No Connect

9 T.M.D.S. data1-

10 T.M.D.S. data1+

11 T.M.D.S. data1 shield

12 No Connect

13 No Connect

14 +5V Power

15 Ground (for +5V) - Cable detect

16 Hot plug detect

17 T.M.D.S. data0-

18 T.M.D.S. data0+

19 T.M.D.S. data0 shield

20 No Connect

21 No Connect

22 T.M.D.S clock shield

23 T.M.D.S. clock+

24 T.M.D.S. clock-

General

DDC Data Re-programming In case the DDC data memory IC or main EEPROM which storage all factory settings were replaced due to a defect, the serial numbers have to be re-programmed "Analog DDC IC, Digital DDC IC & EEPROM". It is advised to re-soldered DDC IC and main EEPROM from the old board onto the new board if circuit board have been replaced, in this case the DDC data does not need to be re-programmed.

Additional information Additional information about DDC (Display Data Channel) may be obtained from Video Electronics Standards Association (VESA). Extended Display Identification Data(EDID) information may be also obtained from VESA.

1. An i486 (or above) personal computer or compatible.

2. Microsoft operation system Windows 95/98 . Y o Install the EDID_PORT_Tool under Win2000/XP . As Fig. 1 .

A. Cody the "UserPort.sys" to C:\WINNT\system32\drivers(win2000)

C:\WINDOWS\system32\drivers(winXP)

B. Running " io.exe" everytime, Before you start to programming

edid data .

4. A/D Alignment kits (12NC: 3138 106 10079): inclusion : a. Alignment box x1 (Fig. 2)

b. Printer cable x1

c. (D-Sub) to (D-Sub) cable x1

D. (D-Sub) to (DVI) cable x1

System and equipment requirements

ou have t

3. EDID46.EXE program

Fig. 1

Fig. 2

To Monitor

D-sub/DVI cable

DC 8~12V

To Printer port

Power indicator

Note: The alignment box has already build-in a batteries socket for

using batteries (8~12V) as power source. Pull out the socket by remove four screws at the rear of box. Please do not forget that remove batteries after programming. The energy of batteries can only drive circuits for a short period of time.

PIN No. SIGNAL

1 Red video input

2 Green video input / sync on green

3 Blue video input

4GND

5 GND - Cable detect

6RedvideoGND

7 Green video GND

8 Blue video GND

9DDC+3.3Vor+5V

10 Logic GND

11 GND

12 Serial data line (SDA)

13 H-sync / H+V

14 V-sync

15 Data clock line (SCL)

Pin assignment

A. 15-pin D-Sub Connector

B. Input DVI -D Connector pin

Fig. 3

Go to cover page

HP L1940

Page 16

DDC Instructions

Step 3: Installation of EDID46.EXE

Method 1: Start on DDC program

Start Microsoft Windows.

1. The Program"EDID46.EXE" in service manual cd-rom be copyed to C:\ .

2. Click , choose Run at start menu of Windows as shown In Fig. 5.

Fig. 5

4. Click OK button. The main menu appears (as shown in Fig. 7). This is for initialize alignment box.

Fig. 7

Fig. 6

3. At the submenu, type the letter of your computer's hard disk drive

followed by :EDID46 (for example, C:\EDID46, as shown in Fig. 6).

Note 2: During the loading, EDID46 will verify the EDID data which just

loaded from monitor before proceed any further function, once the data structure of EDID can not be recognized, the following error message will appear on the screen as below. Please confirm following steps to avoid this message.

1. The data structure of EDID was incorrect.

2. DDC IC that you are trying to load data is empty.

3. Wrong communication channel has set at configuration setup windows.

4. Cables loosed or poor contact of connection.

Fig. 8

Note 1: If the connection is improper, you will see the following error

message (as shown in Fig. 8) before entering the main menu.

Meanwhile, the (read EDID) function will be disable. At this

time, please make sure all cables are connected correctly and fixedly, and the procedure has been performed properly.

Fig. 9

Configuration and procedure

There is no Hardware DDC (DDC IC) anymore. Main EEPROM stores

all factory settings and DDC data (EDID code) which is also called Software DDC. The following section describes the connection and procedure for Software DDC application. The main EEPROM can be reprogrammed by enabling '' factory memory data write'' function on the DDC program (EDID46.EXE).

Initialize alignment box

In order to avoid that monitor entering power saving mode due

to sync will cut off by alignment box, it is necessary to initialize

alignment box before running programming software

(EDID46.EXE). Following steps show you the procedures and

connection.

Step 1: Supply 8-12V DC power source to the Alignment box by

plugging a DC power cord .

Step 2: Connecting printer cable and D-Sub cable of monitor as Fig. 4

Fig. 4

1= Power connector 2= D-SUB connector

To printer port (

TP1)

DC Power

8-12 V

Printer Port

To Monitor

To P C

----->

Go to cover page

HP L1940

Page 17

DDC Instructions

Step 3: Modify DDC data (verify EDID version, week,

year)

Click (new function) icon from the tool bar, bring up Step 1 of 9 as shown in Fig. 14 . EDID46 DDC application provides the function selection and

Step 4: Modify DDC data (Monitor Serial No.)

1. Click Next , bring up Fig. 15.

3. Click OK button to confirm your selection.

4. Click icon (Read EDID function) to read DDC EDID data from monitor. The EDID codes will display on screen as shown in Fig. 13.

Fig. 15

2. Select the DDC2Bi as the communication channel.

As shown in Fig. 12.

Fig. 12

Fig. 13

Fig. 14

Select and fill out, If necessary.

Re-programming Analog DDC IC

Step 1: After initialize alignment box, connecting all

cables and box as shown in Fig. 10.

Fig. 11

Step 2: Read DDC data from monitor

1. Click icon as shown in Fig. 11 from the tool bar to bring up the Channels "Configuration Setup" windows as shown in Fig. 11.

Fig. 10

1=Power connector 2= D-SUB connector

To printer port (

TP1)

DC Power

8-12V

Printer Port

To Monitor

To PC

----->

To PC Video port (D-sub)

Click this button

=====>

Go to cover page

HPL1940

Page 18

DDC Instructions

Fig. 21

Fig. 18

Fig. 19

7. Click Next , bring up Fig. 21.

4. Click Next , bring up Fig.18.

5. Click Next , bring up Fig.19.

6. Click Next , bring up Fig. 20. In this step, please confirm the Descriptor Data Type is

Monitor Range Limits, and all the items are same as below.

Fig. 20

2. Click Next , bring up Fig.16.

Fig. 16

Fig. 17

3. Click Next , bring up Fig.17.

Go to cover page

HP L1940

Page 19

DDC Instructions

Go to cover page

4). Click (Write EDID) icon from the tool bar to write DDC data. then the screen will be black for 5-10 seconds, when the screen recovers ,DDC data will be finished Writing.

2. Access Factory Mode

2). [Push "Auto Adjust " and" +(plus)"and hold them at the same time]+[Press power "Power " button untill comes out "Windows screen"] => then release all button, then press "Menu" button, wait until the OSD menu with Characters "F" (below OSD menu) come on the Screen of the monitor (see Fig. 24).

1). Turn off monitor.

Fig. 24

3) Push Menu to exit OSD menu.""

Fig. 22

8. Click Next , bring up Fig. 22.

- Click Finish to exit the Step window.

- Serial number can be filled up at this moment (for example, TWP318Q001).

NOTE: You must modify the Serial NO. In step 9, otherwise the Serial NO.

In OSD Couldn't be modified correctly.

Step 5: Write DDC data

1. Configuration should be as Fig. 23. And press OK.

Fig. 23

2. Click Save.

Step 7: Exit DDC program

Pull down the File menu and select Exit as shown in Fig. 26.

Step 6: Save DDC data

Sometimes, you may need to save DDC data as a text file for using in other IC chip. To save DDC data, follow the steps below:

1. Click (Save) icon (or click "file"-> "save as") from the tool bar and give a file name as shown in Fig. 25.

The file type is EDID46 file (*.ddc) which can be open in

WordPad. By using WordPad, the texts of DDC data & table (128 bytes, hex code) can be modified. If DDC TEXTS & HEX Table ar completely correct, it can be saved as .ddc flie to re-load it into DDC IC for DDC Data application.

Fig. 26

Step 8: Turn off the monitor, exit the factory mode.

Fig. 25

Factory Mode

Indicator

----------------->

HP L1940

Page 20

Go to cover page

DDC Instructions

HP L1940

Step 3: Modify DDC data (verify EDID version, week,

year)

Click (new function) icon from the tool bar, bring up

Step 1 of 9 as shown in Fig. 31 . EDID46 DDC application provides the function selection and text change (select & fill out) from Step 1 to Step 9.

Step 4: Modify DDC data (Monitor Serial No.)

1. Click Next , bring up Fig. 32.

3. Click OK button to confirm your selection.

4. Click icon (Read EDID function) to read DDC EDID data from monitor. The EDID codes will display on screen as shown in Fig. 30.

Fig. 32

2. Select the DDC2Bi as the communication channel. As shown in Fig. 29.

Fig. 29

Fig. 30

Fig. 31

Select and fill out, If necessary.

Re-programming Digital DDC IC

Step 1: After initialize alignment box, connecting all

cables and box as shown in Fig. 27.

Fig. 28

Step 2: Read DDC data from monitor

1. Click icon as shown in Fig. 11 from the tool bar to bring up the Channels "Configuration Setup" windows as shown in Fig. 28.

Fig. 27

Click this button

=====>

D-sub to DVI-D cable

1=DVI-D connector 2=D-sub connector

3=Power Plug

D-sub cable

DC Power

8 12V~

To video card

To printer port (LTP1)

Monitor Printer Port

Fig. 38

Fig. 35

Fig. 36

7. Click Next , bring up Fig. 38.

4. Click Next , bring up Fig. 35.

5. Click Next , bring up Fig. 36.

6. Click Next , bring up Fig. 37.

In this step, please confirm the Descriptor Data Type is

Monitor Range Limits, and all the items are same as below.

Fig. 37

2. Click Next , bring up Fig. 33.

Fig. 33

Fig. 34

3. Click Next , bring up Fig. 34.

Page 21

Go to cover page

DDC Instructions

HP L1940

3. Click (Write EDID) icon from the tool bar to write DDC data. Then the screen will be black for 5-10 seconds, when the screen recovers ,DDC data will be finished Writing.

Fig. 41

Fig. 39

8. Click Next , bring up Fig. 39.

- Click Finish to exit the Step window.

- Serial number can be filled up at this moment (for example, TWP318Q001).

NOTE: You must modify the Serial NO. In step 9, otherwise the Serial

NO. In OSD Couldn't be modified correctly.

Step 5: Write DDC data

1. Configuration should be as Fig. 40. And press OK.

Fig. 40

2. Click Save.

Step 7: Exit DDC program

Pull down the File menu and select Exit as shown in Fig. 44.

Fig. 44

Step 8: Turn off the monitor, exit the factory mode.

Fig. 43

3) Push Menu toexitOSDmenu.""

2. Access Factory Mode

2). [Push "Auto Adjust " and "+(plus) and hold them at the same

time]+[Press power "Power " button untill comes out "Windows screen"] => then release all button, then press "Menu" button, wait until the OSD menu with Character "F" (below OSD menu) come on the Screen of the monitor (see Fig. 41).

1). Turn off monitor.

4. Confirm Serial Number in User Mode

1) Press the "Power " button to turn off the monitor. Press the button again to turn on the monitor.

2) Press the" Menu " button to bring up the OSD main menu.

3) Press the " Minus "button to " INFORMATION", press the" Menu " button to confirm your selection.

4) Confirm the Serial Number "TWP318Q001" is updated as shown in Fig. 42.

Step 6: Save DDC data

Sometimes, you may need to save DDC data as a text file for using in other IC chip. To save DDC data, follow the steps below:

1. Click (Save) icon (or click "file"-> "save as") from the tool bar and give a file name as shown in Fig. 46.

The file type is EDID46 file (*.ddc) which can be open in WordPad. By

using WordPad, the texts of DDC data & table (128 bytes, hex code) can be modified. If DDC TEXTS & HEX Table ar completely correct, it can be saved as *.ddc flie to re-load it into DDC IC for DDC Data application.

Fig.42

Factory Mode

Indicator

----------------->

Page 22

Go to cover page

Failure description

Phenomenon

Vertical block defect

Vertical dim lines

Vertical lines defect (Always bright or dark)

Horizontal block defect

Horizontal dim lines

Horizontal lines defect (Always bright or dark)

Has bright or dark pixel

Polarizer has bubbles

Foreign material inside polarizer. It shows liner or dot shape.

Concentric circle formed

Bottom back light of LCD is brighter than normal

Back light un-uniformity

Backlight has foreign material. Black or white color, liner or circular type

Quick reference for failure mode of LCD panel

this page presents problems that could be made by LCD panel. It is not necessary to repair circuit board. Simply follow the mechanical instruction on this manual to eliminate failure by replace LCD panel.

Failure Mode Of Panel

HP L1940

Page 23

Safety Test Requirements

All units that are returned for service or repair must pass the original manufactures safety tests. Safety testing requires both

and testing.Hipot Ground Continuity

HI-POT TEST INSTRUCTION

1.Application requirements

1.1 All mains operated products must pass the Hi-Pot test as described in this instruction.

1.2 This test must be performed again after the covers have been refitted following the repair, inspection or modification of the product.

2.1 Connecting conditions

2.1.1 The test specified must be applied between the parallel-

blade plug of the mainscord and all accessible metal parts of the product.

2.1.2 Before carrying out the test, reliable conductive

connections must be ensured and thereafter be maintained throughout the test period.

2.1.3 The mains switch(es) must be in the "ON" position.

2.2 Test Requirements

All products should be HiPot and Ground Continuity tested as follows:

Test 2820VDC 1700VDC Test current:

voltage (2000VAC) (1200VAC) 25A,AC

Test time: Test time 3 seconds 1 second 3 seconds(min.) (min.) Resistance

required: Trip set at 100 uA 5 mA <=0.09+Rohm, current for Max. R is the (Tester) limitation; set resistance of

at 0.1 uA for the mains cord.

Min. Limitation Ramp set at 2 time seconds (Tester)

Test method

Condition HiPot Test for HiPot Test for Ground Continuity

products where products where Test requirement

the mains input the mains input is

range is Full 110V AC(USA

range(or 220V type)

AC)

2.2.1 The minimum test duration for Quality Control Inspector must be 1 minute.

2.2.2 The test voltage must be maintained within the specified voltage + 5%.

2.2.3 There must be no breakdown during the test.

2.2.4 The grounding blade or pin of mains plug must be

conducted with accessible metal parts.

3. Equipments and Connection

3.1. Equipments For example :

- ChenHwa 9032 PROGRAMMABLE AUTO SAFETY

TESTER

- ChenHwa 510B Digital Grounding Continuity Tester

- ChenHwa 901 (AC Hi-pot test), 902 (AC, DC Hi-pot test)

Withstanding Tester

3.2. Connection

4. Recording

Hipot and Ground Continuity testing records have to be kept for a period of 10 years.

* Turn on the power switch of monitor before Hipot and

Ground Continuity testing.

Connect the "video cable" or "grounding screw" to the CLIP on your tester.

Video cable

(Rear view of monitor)

Connect the power cord to the monitor.

Grounding screw

Power outlet

(ChenHwa 9032 tester)

Clip

Go to cover page

HP L1940

Page 24

Go to cover page

ISP CABLE for CPU

Configuration and procedure

ISP ( In System Program) software is provided by Genesis to upgrade the firmware of CPU.

ISP cable is for the interface between "Parallel port of PC" and "15 pin-D-SUB connector of monitor.

System and equipment requirements:

1. An i386 (or above ) personal computer or compatible.

2. Microsoft operation system Win 95/98 or Win 2000

3. ISP software

4. ISP cable (3138 106 10148) as shown in Fig.1

Fig.1 ISP CABLE :12NC IS "3138 106 10148".

5.Connect ISP cable and main cord to monitor as shown in Fig.2.

6. Install and setup the Gprobe 4.5.0.5.exe program

step 1. Create a folder in your PC .for example: D:\1940 step 2.Copy ISP software 1940 software .Zip into your folder step 3.Unzip ISP.ZIP into your folder as shpwn in Fig.3 step 4.Double click the Gprobe4.5.0.5.exe icon to install the application as shown Fig.4

Fig.3

Fig.4

Step 5 . Click the next till the setup finished. And creat a short cut on the desktop.

HP L1940

Page 25

Go to cover page

Update the firmware

1. Double click the Gprobe.exe icon ,then appears window as shown in Fig.5

2. Press the options then choose configure Pin as shown in Fig.5

3. From the menu that appears, choose the number 17 in "output pin and the number 12 in " input pin as shown in Fig.6

Fig.5

Fig.6

4. Press the options then choose connection setup as shown in Fig.7

5. From the menu that appears , choose the DDC2Bi3 in "protocol" and the LPT (0x378) in "port" as shown in Fig.8

Fig.7

Update the firmware click the commands and select the Batch, as shown in Fig.9, Fig.10

Fig.8

Fig.9

Fig.10

Click the button as shown in Fig.10 to browse the Iicisp.txt file in the folder that you create.

ISP CABLE FOR CPU

Note: you should pay attention to the path in the Iicisp.txt file. It is the same as the folder's path that you create.

HP L1940

Page 26

Go to cover page

ISP CABLE FOR CPU

Fig.11 click "OPEN"

Shut of the AC power Click the "OK" button and then open the AC power, after the follow window appears, the update is completed.

HP L1940

Page 27

Repair Tips

Go to cover page

HP L2025

0. Warning

All ICsand many other semi-conductors are susceptible to

electrostaticdischarges (ESD). Careless handling during

repair can reduce life drastically. When repairing, makesure

that you are connectedwith thesamepotential as the mass

of the un

itvia a wristwrap with resistance.Keep components

and toolsalso atthesamepotential!

1. Servicing of SMDs (Surface MountedDevices)

1.1 Generalcautions on handling and storage

-Oxidation on the terminals of SMDs resultsin poorsoldering.

Do not handle SMDs with bare hands.

-Avoidusing storageplaces that are sensitive to oxidation

such as places with sulphur or chlorine gas,direct sunl

ight,

high temperatures orahigh degree of humidity. The

capacitance or resistance value of the SMDs maybe

affectedbythis.

- Rough handling of circuitboards containing SMDs may

cause damage to the componentsas

well as the circuit

boards.Circuitboards containing SMDsshould never be

bent or flexed. Different circuitboardmaterialsexpand and

contract atdifferent rates whenheatedor cooled and the

componentsand/orsolder conn

ections maybe damaged

due to thestress.Never rub orscrape chip componentsas

this maycause the value of the component to change.

Similarly, do not slide the circuitboard across any surface.

1.2 RemovalofSMDs

-Heatthesolder (for 2-3 seconds) at each terminalofthe

chip.Bymeans of litz wire and aslight horizontalforce,

small components canberemovedwith thesoldering iron.

Theycan alsoberemovedwith asolder sucker (see Fig.

1A)

While holding the SMD with a pair of tweezers,takeitoffgently using the

soldering iron's heat appliedtoeach terminal(see Fig. 1 B).

- Remove theexcess solder on thesolder lands by means of

litz wire orasolder sucker (see Fig. 1C).

1.3 Caution on removal

-Whenhandling thesoldering.iron. use suitable pressure a nd be careful.

-When removing the chip, do not use undue force with the pair of tweezers.

- Thesoldering iron to be used(approx. 30 W) should

preferably beequippedwith a thermal control (soldering

temperature: 225 to 250 C).

- The chip, onceremoved, mustnever bereused.

1.4 Attachment of SMDs

- Locate the SMD on thesolder lands by means of tweezers

and solder the component on oneside.Ensure thatthe

component is positionedcorrectly on thesolder lands (see Fig.2A).

-Next complete thesoldering of the terminals of the

component (

see Fiq. 2B).

2. Caution when attaching SMDs

-When soldering the SMD terminals, do not touch them

directly with thesoldering iron. Thesoldering should be

doneasquickly as possible,care mustbe takentoavoid

damage to the terminals of the SMDs themselves.

-Keep the SMD's body in conta

ct with the printedboardwhen

soldering.

- Thesoldering iron to be used(approx. 30 W ) should

preferably beequippedwith a thermal control (soldering

temperature: 225 to 250 C).

- Soldering should not be done outside thesolder land.

- Soldering flux (of rosin) maybe used, but should not be

acidi

- After soldering, letthe SMD cool down gradually at room

temperature.

- The quantity of solder mustbeproportionaltothesize of the

solder land. If the quantity is too great, theSMD might

crack or thesolder lands might be torn loose from the

edboard(see Fig. 3).

Fig.3 Examples

Right

HP L1940

Page 28

Color Adjustment

HP L1940

Go to cover page

Fig. 1

Fig. 2

0-CAL

Fig. 3

Factory Mode Indicator

Note: after alignment,please reset OSD to user s mode for normal

operation. Otherwise, themonitorwon t entering power saving mode and showing full white picture all the time as no video signal supplied.

Toleave factory mode byrestartthe monitor.

5. Adjust OSD menu to lower position of screen (i.g. adjust V-position to value "0"at submenu ofOSDSetting.

6. Setting Brightness and Contrast

- Adjust Brightness to value "90".

- Adjust Contrast to value " 80" .

7. Switch light probetoViewing position.

8. Movethe Lens barrel forward or backward to get clear image as showninFig.4

9. Switch light probe to Measuring position. It should beable to indicate

Fig. 4

Clear image

Measurement/viewing selector

See Fig. 5

Fig. 5

9300° K

13. Press MENU buttons to select RGB. Increase/decrease value by press or buttons until the X, Y co-ordinates as below:

X= 0.283+/- 0.020 Y= 0.297 +/-0.020 Y>= 200 nits

6500 °K

14. Setting X, Y value listed as below: X= 0.313 +/-0.020 Y= 0.329+/-0.020 Y>= 200 nits

Alignment hits:1. Rfor xvalue,Gfor y value,Bfor

Yvalue on the

colour analyzer.

2. If the colour analyzer has been calibrated and preset colour temperature in it. Please switch to correct setting in accordance with colour settings.

15. Gray scale checking

- SwitchTiming/pattern generator to

Pattern:64gray scale Timing:640X480 60Hz KHz

31.47

- Setting bothBrightness 90% and Contrast to 80% (Value).

-Checkblack and white scale are visible clearly across the screen.

10. Setting pattern to full white picture.

11. Press "menu" then select F,by "plus"button.

12. Press "menu"to bring up submenu as following windows.

Note:The bright scale will be saturated, ifYis too large. The dark scale

will beinvisible, ifYis too small. Re-alignment or review

4. Entering factory adjustment mode ofLC D Monitor.

- Power off the monitor,To hold "Auto Adjust" And" +(plus)" buttons at the same time , And p ress "Power"button to power on the monitor. Press "Menu"button to bring upOSD

MENU for confimation.

Cover(black)

White B alance Adjustment

Alignment p rocedure

1. Turn on HP L1940 LCD monitor.

2. Turn on th e Timing/Pattern generator. S ee Fig. 1

Setting generator to provide CROSS-H atchpattern at Resolution :640*480 Timing :H=31 .47kHz V= 60 Hz

3. P reset LCD colour Analyzer CA-110

- Removethe lens p rotectivecover ofprobe CA-A30.

- Set Measuring/viewing selector to Measuring p osition for reset analyzer. (Zero calibration) as Fig. 2

Turn on the colour analyz er (CA-110).

- Press 0-CALbutton to starting reset analyzer. S ee Fig. 3

procedure again to correct this.

Measurement viewing selectorMeasurement viewing selector

Page 29

Repair Flow Chart

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HP L2025

Preparation : dot alternation pattern or windows background.

Preparation : make sure mains supply and video signal are well settled

HP L1940

Page 30

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Repair Flow Chat

Preparation : before chassis debugging, first check all wire harness, remove intrusions, and find errors by visual

HP L1940

Page 31

Repair Flow Chart

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HP L2025

HP L1940

Page 32

Troubleshooting

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HP L1940

Solving Common Problems

The following table lists possible problems, the possible cause of each problem, and the recommended solutions.

Problem Possible Cause Solution

Screen is blank. Power cord is disconnected. Connect the power cord.

Power switch is turned Off. Turn on the power.

Video cable is improperly connected. Connect the video cableproperly.

Screen blanking utility is active. Depress any key on the keyboard or move

The mouse to inactivate the screen blanking Utility.

Image appears

Brightness and contrast Press the Minus button on

blurred, indistinct, or are too low the monitor front panel to

Too dark. auto-adjust the screen. If that

Does not work, press the

Menu button to open the

Basic OSD Menu, and

adjust the brightness and

contrast scales as needed.

Image is not Position may need Adjustment When OSD is inactive,press-(minus

. button) to

auto-adjust the screen image.

Centered. Press the Menu button to access the

Advanced OSD menu. Select Image

Control/Horizontal Position or Vertical

Position to adjust the horizontal or vertical

position of the image.

Check Video Monitor video cable is disconnected. Connect the 15-pin monitor video cable

to the VGA connector on the computer.

Be sure that the computer

power is off while: connecting the video

Cable.

(Input Signal Out of Video resolution and/or Restart your computer and enter Windows

Safe Mode by pressing the F6 Function

key when the computer starts to boot up.

Change your settings to a supported

setting. Restart your computer so that the

new settings take effect.

Range) is displayed refresh rate are set

on screen. higher than what your

monitor supports.

Cable is displayed

on screen.

Page 33

Block Diagram-1

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HP L1940

Scaler

Gm5321

R/G/B

ADDR0/17, Data 0/7 Bank, ROM_OE/WE, Panel_ID

Flash

Memory

30 Pin Connector to panel

D-SUB

Schmitter

gate

HS/VS

DSUB_CA

DDC

EEPROM

IIC

AC to DC

Power

+Inverter

Board

BL_EN, Brightness

Panel PWR

MOS

12V for LPL 5V for CMO/AU

Control

Board

3.3V

12V

1.8V Reg.

LVDS

ISPSCL,SDA

HP L1940 BLOCK FUNCTION

DVI

R+-/G+-/B+-/CLK+-

USB 2.0

GL 850

Upstream

port

3.3V

Key Function

RXO0+/-

RXO1+/-

RXO2+/-

RXO3+/-

RXOC+/-

RXE0+/-

RXE1+/-

RXE2+/-

RXE3+/-

RXEC+/-

Write_enable

Downstream

port x2

EEPROM

D1+/D1-

D0+/D0-

D2+/D2-

12V for LPL 5V for CMO/AU

R/G/B

R+-/G+-/B+-/CLK+-

3.3V

Page 34

Block Diagram-2

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HP L1940

ScalerBoard

15pin

/80mm

30pin/175mm

LVDS/FFC Wire

Control Board

D-sub

DVI

Power + Inverter

Board

7pin/340mm

UP Stream

Port

150mm

125mm

130mm

90mm

Two Layer

Down stream

Port

Page 35

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HP L1940

Wiring Diagram

Page 36

Scaler Diagram-1

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HP L1940

Page 37

Scaler Diagram-2

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HP L1940

Page 38

Scaler Diagram-3

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HP L1940

Page 39

Scaler Diagram-4

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HP L1940

Page 40

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HP L1940

Scaler Diagram-5

Page 41

Scaler Board C.B.A.-1

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HP L1940

Page 42

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HP L1940

Scaler Board C.B.A.-2

Page 43

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HP L1940

Control Diagram & C.B.A

Page 44

Power Diagram-1

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HP L1940

Page 45

Power Diagram-2

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HP L1940

Page 46

Power Board C.B.A.

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HP L1940

Page 47

Power Board C.B.A

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HP L1940

Page 48

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Exploded view

HP L1940

313815758131

STAND-HPL1940

313815414121

BACK COVER

313815758121

MAIN SHIELD ASSY

313815136221

AC BRACKET

823827716171

LIPS(T50P057.00)

1052

313815859821

SCALER ASSY

1052

313815861441

MAIN FRAME+WIRE ASSY - LPL

1160

932221474682

TFT-LCD LM190E02-A4(H)(LGPH)

1050

313815758111

FRONT BEZEL ASSY

313815564901

FRONT COVER

313815860161

CONTROL ASSY

1053

Page 49

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HP L1940

2231 223878615649 CER2 0603 X7R 16V 100N PM10 2233 223878615649 CER2 0603 X7R 16V 100N PM10 2234 223878615649 CER2 0603 X7R 16V 100N PM10 2301 223878615649 CER2 0603 X7R 16V 100N PM10 2302 223878615649 CER2 0603 X7R 16V 100N PM10 2401 202001293721 ELCAP SM RV2 16V 10U PM20 2402 202002191725 ELCAP SM RVS 16V 10U PM20 2403 223878615649 CER2 0603 X7R 16V 100N PM10 2404 223878615649 CER2 0603 X7R 16V 100N PM10 2405 223878615649 CER2 0603 X7R 16V 100N PM10 2406 223878615649 CER2 0603 X7R 16V 100N PM10 2407 223878615649 CER2 0603 X7R 16V 100N PM10 2408 202001293721 ELCAP SM RV2 16V 10U PM20 2409 223878615649 CER2 0603 X7R 16V 100N PM10 2410 223878615649 CER2 0603 X7R 16V 100N PM10 2411 223878615649 CER2 0603 X7R 16V 100N PM10 2412 223878615649 CER2 0603 X7R 16V 100N PM10 2413 223878615649 CER2 0603 X7R 16V 100N PM10 2414 223878615649 CER2 0603 X7R 16V 100N PM10 2415 223878615649 CER2 0603 X7R 16V 100N PM10 2416 223878615649 CER2 0603 X7R 16V 100N PM10 2417 202001293721 ELCAP SM RV2 16V 10U PM20 2418 223878615649 CER2 0603 X7R 16V 100N PM10 2419 202002191725 ELCAP SM RVS 16V 10U PM20 2420 223878615649 CER2 0603 X7R 16V 100N PM10 2421 223878615649 CER2 0603 X7R 16V 100N PM10 2422 223878615649 CER2 0603 X7R 16V 100N PM10 2423 223878615649 CER2 0603 X7R 16V 100N PM10 2424 223878615649 CER2 0603 X7R 16V 100N PM10 2425 202002191725 ELCAP SM RVS 16V 10U PM20 2426 202002191725 ELCAP SM RVS 16V 10U PM20 2427 202001293721 ELCAP SM RV2 16V 10U PM20 2428 223878615649 CER2 0603 X7R 16V 100N PM10 2430 202001293721 ELCAP SM RV2 16V 10U PM20 2431 223878615649 CER2 0603 X7R 16V 100N PM10 2432 223878615649 CER2 0603 X7R 16V 100N PM10 2433 223878615649 CER2 0603 X7R 16V 100N PM10 2434 223878615649 CER2 0603 X7R 16V 100N PM10 2435 202001293721 ELCAP SM RV2 16V 10U PM20 2436 223878615649 CER2 0603 X7R 16V 100N PM10 2437 202001293721 ELCAP SM RV2 16V 10U PM20 2438 223878615649 CER2 0603 X7R 16V 100N PM10 2439 202002191725 ELCAP SM RVS 16V 10U PM20 2440 223878615649 CER2 0603 X7R 16V 100N PM10 2441 223878615649 CER2 0603 X7R 16V 100N PM10 2442 223878615649 CER2 0603 X7R 16V 100N PM10 2443 223878615649 CER2 0603 X7R 16V 100N PM10 2444 223878615649 CER2 0603 X7R 16V 100N PM10 2445 223878615649 CER2 0603 X7R 16V 100N PM10 2446 223878615649 CER2 0603 X7R 16V 100N PM10 2450 223886715478 CER1 0603 NP0 50V 4P7 PM0P25 2451 223886715478 CER1 0603 NP0 50V 4P7 PM0P25 2452 223858615636 CER2 0603 X7R 50V 10N PM10 2453 223858615636 CER2 0603 X7R 50V 10N PM10 2454 223858615636 CER2 0603 X7R 50V 10N PM10 2455 223858615636 CER2 0603 X7R 50V 10N PM10 2460 202203100179 ELCAP SM HV 25V 10U PM20 2461 223878615649 CER2 0603 X7R 16V 100N PM10 2501 223891015649 CER2 0805 X7R 25V 100N PM10 2502 223891015649 CER2 0805 X7R 25V 100N PM10 2503 202203100206 ELCAP SM HV 25V 47U PM20 2504 223878615649 CER2 0603 X7R 16V 100N PM10 2505 223878615649 CER2 0603 X7R 16V 100N PM10 2506 202203100206 ELCAP SM HV 25V 47U PM20 2508 223878615649 CER2 0603 X7R 16V 100N PM10 2510 223878615649 CER2 0603 X7R 16V 100N PM10 2511 223878615649 CER2 0603 X7R 16V 100N PM10 2513 223878615649 CER2 0603 X7R 16V 100N PM10 2514 223878615647 CER2 0603 X7R 16V 68N PM10 2515 203803513312 ELCAP RGA 25V S 47U PM20 2516 202203100179 ELCAP SM HV 25V 10U PM20 2517 223858015641 CER2 0805 X7R 50V 22N PM10 2518 223886715221 CER1 0603 NP0 50V 220P PM5 2519 202203100068 ELCAP GL 25V S 470U PM20 2521 223878615649 CER2 0603 X7R 16V 100N PM10 2523 223878615649 CER2 0603 X7R 16V 100N PM10 2525 223878615649 CER2 0603 X7R 16V 100N PM10 2529 223878615649 CER2 0603 X7R 16V 100N PM10 2531 223878615649 CER2 0603 X7R 16V 100N PM10 2601 223824619863 CER2 0603 Y5V 10V 1U P8020 2602 223824619863 CER2 0603 Y5V 10V 1U P8020 2603 223878615649 CER2 0603 X7R 16V 100N PM10 2604 223878615649 CER2 0603 X7R 16V 100N PM10 2605 223878615649 CER2 0603 X7R 16V 100N PM10

2606 223878615649 CER2 0603 X7R 16V 100N PM10 2607 223878615649 CER2 0603 X7R 16V 100N PM10 2608 223878615649 CER2 0603 X7R 16V 100N PM10 2609 223878615649 CER2 0603 X7R 16V 100N PM10 2610 223878615649 CER2 0603 X7R 16V 100N PM10 2611 223878615649 CER2 0603 X7R 16V 100N PM10 2612 223878615649 CER2 0603 X7R 16V 100N PM10 2615 223878615649 CER2 0603 X7R 16V 100N PM10 2616 202001293721 ELCAP SM RV2 16V 10U PM20 2618 223878615649 CER2 0603 X7R 16V 100N PM10 2619 223878615649 CER2 0603 X7R 16V 100N PM10 2620 223886715189 CER1 0603 NP0 50V 18P PM5 2621 223886715189 CER1 0603 NP0 50V 18P PM5 2622 202203100227 ELCAP KM 25V S 100U PM20 2623 223878615649 CER2 0603 X7R 16V 100N PM10 2624 202203100227 ELCAP KM 25V S 100U PM20 2625 223878615649 CER2 0603 X7R 16V 100N PM10 2627 222224119876 CER2 1206 Y5V 10V 10U P8020 2630 223878615649 CER2 0603 X7R 16V 100N PM10

3202 212211805669 RST SM 0603 RC0603 10K PM5 3203 212211805669 RST SM 0603 RC0603 10K PM5 3204 212211805669 RST SM 0603 RC0603 10K PM5 3206 232270260101 RST SM 0603 RC21 100R PM5 3207 232270260101 RST SM 0603 RC21 100R PM5 3209 232270260104 RST SM 0603 RC21 100K PM5 3210 232270260101 RST SM 0603 RC21 100R PM5 3211 232270260101 RST SM 0603 RC21 100R PM5 3212 232270260101 RST SM 0603 RC21 100R PM5 3216 232270260101 RST SM 0603 RC21 100R PM5 3217 232270260101 RST SM 0603 RC21 100R PM5 3218 232270260101 RST SM 0603 RC21 100R PM5 3219 232270260101 RST SM 0603 RC21 100R PM5 3221 212211805669 RST SM 0603 RC0603 10K PM5 3222 212211805669 RST SM 0603 RC0603 10K PM5 3223 232270260101 RST SM 0603 RC21 100R PM5 3224 232270260101 RST SM 0603 RC21 100R PM5 3225 232270260101 RST SM 0603 RC21 100R PM5 3226 232270260101 RST SM 0603 RC21 100R PM5 3227 232270260222 RST SM 0603 RC21 2K2 PM5 3228 232270260222 RST SM 0603 RC21 2K2 PM5 3229 232270260104 RST SM 0603 RC21 100K PM5 3230 212211805669 RST SM 0603 RC0603 10K PM5 3232 232270296001 RST SM 0603 JUMP. MAX 0R05 3233 232270467509 RST SM 0603 RC22H 75R PM1 3234 232270296001 RST SM 0603 JUMP. MAX 0R05 3235 232270467509 RST SM 0603 RC22H 75R PM1 3236 232270296001 RST SM 0603 JUMP. MAX 0R05 3237 232270467509 RST SM 0603 RC22H 75R PM1 3241 212211805635 RST SM 0603 RC0603 10R PM5 3242 212211805669 RST SM 0603 RC0603 10K PM5 3243 212211805635 RST SM 0603 RC0603 10R PM5 3244 232270260479 RST SM 0603 RC21 47R PM5 3245 232270260479 RST SM 0603 RC21 47R PM5 3246 212211805669 RST SM 0603 RC0603 10K PM5 3247 212211805669 RST SM 0603 RC0603 10K PM5 3301 212211805669 RST SM 0603 RC0603 10K PM5 3302 212211805669 RST SM 0603 RC0603 10K PM5 3306 212211805669 RST SM 0603 RC0603 10K PM5 3307 212211805669 RST SM 0603 RC0603 10K PM5 3308 232270260101 RST SM 0603 RC21 100R PM5 3309 232270260101 RST SM 0603 RC21 100R PM5 3310 212211805669 RST SM 0603 RC0603 10K PM5 3333 212211805669 RST SM 0603 RC0603 10K PM5 3338 212211805669 RST SM 0603 RC0603 10K PM5 3339 212211805669 RST SM 0603 RC0603 10K PM5 3340 232270260101 RST SM 0603 RC21 100R PM5 3401 232270260101 RST SM 0603 RC21 100R PM5 3402 232270260101 RST SM 0603 RC21 100R PM5 3404 232270281121 RST SM 0603 RC21 120R PM5 3405 232270281121 RST SM 0603 RC21 120R PM5 3406 232270281121 RST SM 0603 RC21 120R PM5 3408 232270462491 RST SM 0603 RC22H 249R PM1 3409 232270260479 RST SM 0603 RC21 47R PM5 3413 232270260479 RST SM 0603 RC21 47R PM5 3501 232270260479 RST SM 0603 RC21 47R PM5 3502 232270260479 RST SM 0603 RC21 47R PM5 3503 212211805669 RST SM 0603 RC0603 10K PM5 3505 232270260101 RST SM 0603 RC21 100R PM5 3506 232270260101 RST SM 0603 RC21 100R PM5 3507 232270260101 RST SM 0603 RC21 100R PM5 3509 232270260221 RST SM 0603 RC21 220R PM5 3510 232270260221 RST SM 0603 RC21 220R PM5 3511 212211805669 RST SM 0603 RC0603 10K PM5

Model: HP L1940(LPL) 12NC: 8639 000 15804

Mechanical Parts

30 313815758111 FRONT BEZEL ASSY 31 313815414111 BEZEL 32 313815414131 CONTROL BUTTON 33 313815414141 LENS-POWER 34 313815161731 HP LOGO 7121 - 8115 41 313815414121 BACK COVER 50 313815758131 STAND-HPL1940 91 313815758121 MAIN SHIELD ASSY 92 313815136221 AC BRACKET 93 313815564901 FRONT COVER 301 313815136141 MAIN FRAME-LPL/CMO 340 313815136151 MAIN SHIELD

Packing Parts

450 313815638761 CARTON 451 313815638461 CUSHION-R 452 313815638471 CUSHION-L 453 313815620801 PE BAG

Accessory

601 313811707601 HP CD-ROM INF. 1157 313818879271 MAINSCORD IEC 10A 1M83 DET BK 1158 313819871252 CORD SUB-D 15/1M8/SUB-D 15 BK 1159 313819873991 CORD USB A/2M/USB B BK

miscellanea

291 313815564931 LABEL-CPU 295 313815564941 LABEL-EEPROM-LPL 298 313815564961 LABEL-EEPROM-USB 615 313811707611 HEX CODE OF F/W(NO MATL REQ) 1160 313815861441 MAIN FRAME+WIRE ASSY - LPL 1201 242203300521 SOC DVI H 24P F 1.91DVI-D 1203 242202518065 SOC SUBD H 15P F BU 900 1302 243803100435 SOC IC V 8P F 2.54 DIL 1410 242254300999 RES XTL SM 14M318 20P SMD-49 1412 242202518682 CON H 30P F 1.00 SM FFC 0.3 1601 242254301447 RES XTL SM 12MHZ 32P SMD-49 1602 823827716661 USB B TYPE RECEPTACLE CONN 1603 823827716671 USBA TYPE DOUBLE PORT CONN 1608 243803100435 SOC IC V 8P F 2.54 DIL 1932 242212803035 SWI TACT SM 1P 1POS SKQGAB 1933 242212803035 SWI TACT SM 1P 1POS SKQGAB 1934 242212803035 SWI TACT SM 1P 1POS SKQGAB 1935 242212803035 SWI TACT SM 1P 1POS SKQGAB 1936 242212803035 SWI TACT SM 1P 1POS SKQGAB 4444 313810610427 CD ROM - SERVICE MANUAL 4444 313810610428 SERVICE MANUAL 8161 313819873981 CBLE-267 7/330/7-267 AWG28 8163 313819873971 FFC 30/180/30 1.0

LCD Panel

1050 932221474682 TFT-LCD LM190E02-A4(H)(LGPH)

PCB Assy

1051 313815859821 SCALER ASSY 1052 823827716171 LIPS(T50P057.00) 1053 313815860161 CONTROL ASSY

PCB Assy

1051 313815859821 SCALER ASSY

2201 223878615649 CER2 0603 X7R 16V 100N PM10 2202 223878615649 CER2 0603 X7R 16V 100N PM10 2203 223878615649 CER2 0603 X7R 16V 100N PM10 2204 223878615649 CER2 0603 X7R 16V 100N PM10 2209 223878615649 CER2 0603 X7R 16V 100N PM10 2214 223878615649 CER2 0603 X7R 16V 100N PM10 2218 223886715339 CER1 0603 NP0 50V 33P PM5 2219 223886715221 CER1 0603 NP0 50V 220P PM5 2220 223878615649 CER2 0603 X7R 16V 100N PM10 2221 223878615649 CER2 0603 X7R 16V 100N PM10 2225 223858615636 CER2 0603 X7R 50V 10N PM10 2227 223858615636 CER2 0603 X7R 50V 10N PM10 2229 223858615636 CER2 0603 X7R 50V 10N PM10

Spare/Recommended Parts List

Page 50

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3512 212211805669 RST SM 0603RC060310KPM5 3514 232270296001 RST SM 0603JUMP. MAX0R05 3515 232270260 1 04 RST SM 0603 RC21 100KPM5 3516 23227026010 4 RST SM 0603 RC21 100KPM5 3518 212211805972 RST SM 1206JUMP. MAX0R05 3519 213811201472 RST SM 0805 RC05 4K7 PM5 3520 232273461802 RST SM 0805 RC12H 1K8 PM1 3521 232273465

602 RST SM 0805 RC12H 5K6 PM1 3522 212211805669 RST SM 0603RC060310KPM5 3523 212211805669 RST SM 0603RC060310KPM5 3524 212211805669 RST SM 0603RC060310KPM5 3527 232270296001 RST SM 0603JUMP. MAX0R05 3528 232270296001 RST SM 0603JUMP. MAX0R05 3605 232270296001 RST SM 0603JUMP. MAX0R05 360

6 232270296001 RST SM 0603JUMP. MAX0R05 3607 212211805972 RST SM 1206JUMP. MAX0R05 3608 212211805669 RST SM 0603RC060310KPM5 3610 232270260152 RST SM 0603 RC21 1K5 PM5 3611 232270260104 RST SM 0603 RC21 100KPM5 3613 232270464991 RST SM 0603 RC22H 499R PM1 3614 232270296001 RST SM 0603JUMP. MAX0R05 3615 212211805689 RST SM 0603RC06031MPM5 3616 212211805678 RST SM 0603RC0603 47K PM5 3617 212211805669 RST SM 0603RC060310KPM5 3618 212211805972 RST SM 1206JUMP. MAX0R05 3620 212266200161 PTC SM 1812 13V2 0R45 PM 3621 212211805689 RST SM 0603RC06031MPM5 3622 212266200161 PTC SM 1812 13V2 0R45 PM 3623 212211805689 RST SM 0603RC06031MPM5 3630 232270463309 RST SM 0603 RC22H 33R PM1 3633 232270463309 RST SM 0603 RC22H 33R PM1 3634 232270296001 RST SM 06

03JUMP. MAX0R05 3635 232270296001 RST SM 0603JUMP. MAX0R05 3642 232270463309 RST SM 0603 RC22H 33R PM1 3645 232270463309 RST SM 0603 RC22H 33R PM1 3646 232270463309 RST SM 0603 RC22H 33R PM1 3649 232270463309 RST SM 0603 RC22H 33R PM1 3650 232270296001 RST SM 0603JUMP. MAX0R05 3651 232270296001 RST SM 0603JUMP. MAX0R05 3652 232270296001 RST SM 0603JUMP. MAX0R05 365

3 232270296001 RST SM 0603JUMP. MAX0R05 3654 212211805672 RST SM 0603RC060315KPM5 3655 212211805672 RST SM 0603RC060315KPM5 3656 212211805672 RST SM 0603RC060315KPM5 3657 212211805672 RST SM 0603RC060315KPM5

5201 242254945582 IND FXD 0805 EMI 100MHZ 300R 5202 242254945582 IND FXD 0

805 EMI 100MHZ 300R 5203 242254945582 IND FXD 0805 EMI 100MHZ 300R 5302 242254945582 IND FXD 0805 EMI 100MHZ 300R 5401 242254945582 IND FXD 0805 EMI 100MHZ 300R 5403 242254945582 IND FXD 0805 EMI 100MHZ 300R 5404 242254945582 IND FXD 0805 EMI 100MHZ 300R 5405 242254945582 IND FXD 0805 EMI 100MHZ 3

00R 5406 242254945582 IND FXD 0805 EMI 100MHZ 300R 5407 242254945582 IND FXD 0805 EMI 100MHZ 300R 5408 242254945582 IND FXD 0805 EMI 100MHZ 300R 5409 242254945582 IND FXD 0805 EMI 100MHZ 300R 5410 242254945579 IND FXD 1206EMI100MHZ 100R 5411 242253600782 IND FXD TSL0808 S 33U PM10 5501 242254945579 IND FXD 1206EMI100MHZ 1

00R 5502 242254945579 IND FXD 1206EMI100MHZ 100R 5504 313818875771 COI CHOKE 35UH 82M OHM DR10X8 5601 242254945579 IND FXD 1206EMI100MHZ 100R 5603 242254900126 IND FXD 0805 EMI 100MHZ 120R 5604 242254900126 IND FXD 0805 EMI 100MHZ 120R 5605 242254945579 IND FXD 1206EMI100MHZ 100R 5606 242254945579 IND FXD 1206EMI100MHZ 100R 5607 24225

4945579 IND FXD 1206EMI100MHZ 100R

6201 933215370215 DIO SIG SM BAV99 (PHSE) 6202 933215370215 DIO SIG SM BAV99 (PHSE) 6203 933215370215 DIO SIG SM BAV99 (PHSE) 6204 933215370215 DIO SIG SM BAV99 (PHSE) 6205 933215370215 DIO SIG SM BAV99 (PHSE) 6206 933215370215 DIO SIG SM BAV99 (PHSE) 6207 933215370215 DIO SIG SM BAV99 (PHSE) 6208 933215370215 DIO SIG SM BAV99 (PHSE) 6209 933137390215 DIO REG SM BZX84-C5V1 (PHSE) 6220 933742280215 DIO SIG SM BAT54 (PHSE) 6221 933913910

115 DIO SIG SM BAS32L (PHSE)

6222 933913910115 DIO SIG SM BAS32L (PHSE)

6223 933742280215 DIO SIG SM BAT54 (PHSE) 6501 932216670682 DIO REC SB240 A (VISH)

7202 932216972682 IC SM AT24C02N-10SC-2.7(ATME) 7203 932216972682 IC SM AT24C02N-10SC-2.7(ATME) 7210 935260739118 IC SM 74LVC14APW (PHSE) 7301 313815860721 CPU IC ASSY 7301 932219386682 IC SM M29W022BT55K1 (ST00) 7302 313815861451 EEPROM ASSY-LPL 7302 932214725682 IC M24C16-WBN6 (ST00) 7401 932220818671 IC SM GM5321-BC (GEMI) 7403 932220099685 IC SM LD1117AS18 (ST00) 7501 932200429685 TRA SIG SM BC857C (ONSE) 7502 932200429685 TRA SIG SM BC857C (ONSE) 750

3 932209265685 TRA SIG SM MUN2211J (ONSE) 7504 932216638668 FET POW SM SI5441DC (VISH) 7505 932219076668 IC SM L5972D (ST00) 7601 823827716201 USB CONTROLLER 7608 313815860731 EEPROM ASSY-USB 7608 823827716241 MEMORY IC

PCB Assy

1053 313815860161 CONTROL ASSY

3933 212211805678 RST SM 0603RC0603 47K PM5 3934 232270260472 RST SM 0603 RC21 4K7 PM5 3935 212211805669 RST SM 0603RC060310KPM5

6931 932218082685 LED VS SM KAA-3528YSGC (KIEL)

Recommended Parts List

30 313815758111 FRONT BEZEL ASSY 31 313815414111 BEZEL 32 313815414131 CONTROL BUTTON 33 313815414141 LENS-POWER 41 313815414121 BACK COVER 50 313815758131 STAND-HPL1940 93 313815564901 FRONT COVER 450 313815638761 CARTON 451 313815638461 CUSHION-R 452 313815638471 CUSHION-L 453 313815620801PEBAG 601 313811707601 HP CD-ROM INF. 615 313811707611 HEX CODE OF F/W(NO MATL REQ) 1158 313819871252CORDSUB-D15/1M8/SUB-D 15 BK 6201 933215370215 DIO SIG SM BAV99 (PHSE) 6209 933137390215 DIO REG SM BZX84-C5V1 (PHSE) 6220 933742280215 DIO SIG SM BAT

54(PHSE) 6222 933913910115 DIO SIG SM BAS32L (PHSE) 6223 933742280215 DIO SIG SM BAT54(PHSE) 7203 932216972682 IC SM AT24C02N-10SC-2.7(ATME) 7210 935260739118 IC SM 74LVC14APW (PHSE) 7302 932214725682 IC M24C16-WBN6 (ST00) 7401 932220818671 IC SM GM5321-BC (GEMI) 7503932209265685 TRA SIG SM MUN2211J (ONSE) 7504 932216638668 FET POW SM SI5441DC (VISH) 8161 313819873981 CBLE-267 7/330/7-267 AWG28 8163 313819873971 FFC 30/180/30 1.0

Spare/Recommended Parts List

HP L1940

Page 51

HP L1940

GENERAL PRODUCT

SPECIFICATION

. ANALOG AND DIGITAL DUAL INPUT

. AUTO PICTURE ADJUSTMENT

. 15 FACTORY PRESET MODES

10 USER MODES

. USER FRIENDLY OSD DISPLAY FOR MODE IDENTIFICATION

/ADJUSTMENT

. DDC 2B COMMUNICATION CAPABILITY and DDC/CI SUPPORT

. MAX. RESOLUTION 1280*1024 NON-INTERLACED AT 76 HZ

.19

COLOR TFT LCD FLAT PANEL

. EASY TILT & SWIVEL BASE

. FULL RANGE POWER SUPPLY 90 - 265 VAC

. CE ENVIRONMENTAL POLICY

. ANTI-GLARE TO REDUCE LIGHT REFLECTION

. POWER MANAGEMENT CAPABILITY

. TCO2003

. USB 2.0 HUB

GENERAL PRODUCT SPECIFICATION

Go to cover page

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 52

Go to cover page

HP L1940

CONTENTS

1.0 Foreword

2.0 Product profile

2.1 LCD

2.2 Scanning frequencies

2.3 Video dot rate

2.4 Power input

2.5 Power consumption

2.6 Dimensions

2.7 Weight

2.8 Functions

2.9 Ambient temperature

2.10 Regulatory compliance

3.0 Electrical characteristics

3.1 Interface signals

3.2 Interface

3.2.1 D-sub cable

3.2.2 DVI cable

3.2.3 OSD function control

3.3 Timing requirement

3.3.1 Mode storing capacity

3.3.2 Factory preset timings

3.3.3 Horizontal scanning

3.3.4 Vertical scanning

3.4 Power input connection

3.5 Power management

3.6 Display identification

3.6.1 Analog DDC

3.6.2 Digital DDC

4.0 Visual characteristics

4.1 Test conditions

4.2 Resolution

4.3 Average surface brightness

4.4 Brightness uniformity

4.5 Check cross talk

4.6 White color adjustment

5.0 Mechanical characteristics

5.1 Controls

5.2 Unit dimension / weight

5.3 Tilt and swivel base

5.4 Transportation packages

5.4.1 Shipping dimension / weight

5.4.2 Block unit / palletization

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 53

HP L1940

6.0 Environmental characteristics

6.1 Susceptibility of display to external environment

6.1.1 Temperature ranges

6.1.2 Humidity

6.1.3 Altitude

6.2 Transportation tests

6.2.1 Drop

6.2.2 Vibration and shock

6.2.3 Operating condition

6.2.4 Non-operating

6.3 Display disturbances from external environment

7.0 Reliability

7.1 Mean time between failures

8.0 Quality assurance requirements

8.1 Acceptance test

9.0 Serviceability

10.0 Defects

10.1 Visual inspection

10.2 Mechanical light leakage

10.3 Allowable defect

10.4 Defect limits

10.5 Smudges, streaks and smears

10.6 Mura and splotchiness

10.7 Optical light leakage

10.8 LCD inspection

11.0 USB 2.0 HUB

1.0 FOREWORD This specification describes a 19" SXGA multi-scan color TFT LCD monitor with max resolution up to 1280*1024 /76 Hz non-interlaced.

2.0 PRODUCT PROFILE This display monitor unit is a color display monitor enclosed in HP styling cabinet, which has an integrated tilt and swivel base.

2.1 LCD

a.) Type NR. : LM190E02_A5 (LPL)

Number of Pixels. : 1280 (H) x 1024 (V) Physical Size. : 404.2(H)*330.0(V)*20.0(D) mm Pixel Pitch. : 0.294 x 0.294 mm Color pixel arrangement. : RGB stripes arrangement Support Color. : 8 bit (16.7M Colors)

Display Mode. : Transmissive Mode,Normally Black

Backlight. : CCFL edge light system Active area. (WXH). : 376.32(H) x 301.056(V)mm (19

diagonal)

Go to cover page

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 54

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HP L1940

Viewing Angle. : Vertical 176 degree, Horizontal 176 degree (CR=10)

Contrast ratio. : 500:1

Luminance. : 250 cd/m

(Typ)

b.) Type NR. : M190E3-L01 (CMO)

Number of Pixels. : 1280 (H) x 1024 (V)

Physical Size. : 404.2(H)*330.0(V)*20.0(D) mm Pixel Pitch. : 0.294 x 0.294 mm Color pixel arrangement : RGB stripes arrangement

Support Color. : 8 bit (16.7M Colors)

Display Mode. : Transmissive Mode, Normally Black

Backlight. : CCFL edge light system Active area. (WXH). : 376.32(H) x 301.056(V)mm (19

diagonal) Viewing Angle. : Vertical 170 degree, Horizontal 170 degree (CR=10) Contrast ratio. : 800:1

Luminance. : 250 cd/m

(Typ)

c.) Type NR. : M190EN03 (AUO) (Option)

Number of Pixels. : 1280 (H) x 1024 (V)

Physical Size. : 396.5(H)*32450(V)*14.33(D) mm Pixel Pitch. : 0.294 x 0.294 mm Color pixel arrangement : RGB stripes arrangement Support Color. : 8 bit (16.7M Colors)

Display Mode. : Transmissive Mode, Normally Black

Backlight. : CCFL edge light system Active area. (WXH). : 376.32(H) x 301.056(V)mm (19

diagonal) Viewing Angle. : Vertical 176 degree, Horizontal 176 degree (CR=10) Contrast ratio. : 700:1

Luminance. : 250 cd/m

(Typ)

2.2 Scanning frequencies H-Frequency. : 30K - 83 K Hz V-Frequency. : 56 - 76 Hz

2.3 Video dot rate. : < 140 MHz

2.4 Power input. : 90-265 V AC, 50/60 ± 2Hz

2.5 Power consumption. : < 70 W maximum (with USB )

2.6 Dimensions. : 413(W) * 477(H) * 265(D) mm

2.7 Net Weight. : 8.4 kg

2.8 Functions: (1) D-Sub analog R/G/B separate inputs, H/V sync separated

(2) DVI-D digital Panel Link TMDS input

(3) USB 2.0 HUB with one upstream port and two downstream port

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 55

HP L1940

2.9 Ambient temperature: 5 °C-35°C

2.10 Regulatory compliance:

Safety

EN 60950 (IEC 950): CB SCHEME CERTIFICATION: UL APPROVAL: CSA APPROVAL: VDE / TUV APPROVA L: NORDIC SAFETY APPROVAL : MEXICAN SAFETY COMPLIANCE: POLAND COMPLIANCE (PCBC): RUSSIAN COMPL IANCE (GOST): SLOVENIAN APPROVAL (SIQ): SLOVAK REPUBLIC APPROVAL (EVPU): CROATIA APPROVAL (KONKAR): CHINA APPROVAL (CCC): SINGAPORE CONSUMER PROTECTION REGISTRATION SCHEME OF SINGAPORE ( SISIR ): UKRAINE APPROVAL (UKRSERTCOMPUTER): SAUDI ARABIA APPROVAL (SASO): BELARUS APPROVAL (B NCI): LITHUA NIA APPROVAL (INFOSTRUKTURA): ARGENTINA CERTIFICATION (IRAM):

EMC

FCC APPROVAL (USA): Part 15 class B C.I.S.P.R. REQUIREMENTS: C.I.S.P.R. Pub lication 22 Class B. V.C.C.I. APPROVAL (Jap an): Class B. MINISTRY OF COMMERCE REQUIREMENTS (New Zealand): Clas s B. CANADIAN REQUIREMENTS: ICES-003 Class B AUSTRALIAN ACA APPROVA L: ACA AS/NZS 3548, Class B TAIWAN BSMI APPROVAL: (CNS) 13438 (CISPR 22), Class B CHINA CCC A PPROVAL: KOREA MIC APPROVAL: MIC Korea " EMC Registration Regulation " Clas s B HARMONIC CURRENT EMISSIONS : IEC 61000-3-2 (EN 61000-3-3 ) VOLTA GE FLUCTUATIONS FLICK ER REQUIREMENTS: IEC 61000-3-3 ( EN 61000-3-2 ) EN 55022:1998 EN 55024 consist ing of : IEC 61000-4-2 / -3 /-4/ -5 / -6 / -8 / -11

Ergonomics

ISO ERGONOMICS: ISO13406-2 (Cl ass II is required f or pi xel defects )(TUV/ERG ) SWEDISH ERGONOMICS AND EMISSIONS: MPRII, TCO99, Nutek GERMAN ERGONOMIC APPROVAL: EK1-ITB2000 ( TUV/GS ) TCO 2003 APPROVAL: (i n feature)

Agency

CCC (China), CE (Europe), CSA (Canada),

IEC950 CB Report, NOMNYCE (Mexico), PSB (Singapore), SEMKO (Nordic), IRMA ( Argentina ) TUV (Germany), UL (USA) GOST (Russia), B-MARK (Poland), DEMKO (Nordic), FIMKO (Nordic),

SISIR, CPA (Singapor e), EZU (Czech) , MIC ( Korea)

Compatibility PC2001, Windows 2000, Windows 98/Me, Windows XP, NSTL,USB-IF

Go to cover page

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 56

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HP L1940

3.0 Electrical characteristics

3.1 Interface signals The input signals can be applied in two different modes:

1). D-shell Analog

Input signal: Video, H-sync, V-sync,

Video : 0.7 V p-p, input impedance, 75 ohm

Sync. : Separate sync TTL level, input impedance 2k2 ohm termination

H-sync Positive/Negative V-sync Positive/Negative

2). Intel DVI Digital

Input signal: Four channel TMDS signals. The digital interface shall be comprised of 2 electrical layer component: a TMDS interface for low-voltage differential serial encoding of the digital display data(Panel Link compliant) and a DDC2B electrical interface. Refer to the Digital Display Working Group(DDWG) document,

Digital

Visual Interface(DVI) Specification, Revision 1.0

for the exact requirements.

3.2 Interface

3.2.1 D-Sub Cable Length : 1.8 M +/- 50 mm (fixed) Connector type : D-sub male with DDC-2B pin assignments.

Blue connector thumb-operated jack screws

Pin Assignment:

PIN No. SIGNAL

1 Red video input 2 Green video input 3 Blue video input 4 GND 5 Cable detect 6 Red video GND 7 Green video GND 8 Blue video GND

9 DDC +3.3V or +5V 10 GND 11 GND 12 Serial data line (SDA) 13 H-sync 14 V-sync 15 Data clock line (SCL)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

GENERAL PRODUCT SPECIFICATION(Continued)

Page 57

HP L1940

3.2.2 DVI Cable The input signals are applied to the display through DVI-D cable. Length : 1.8 M +/- 50 mm (fixed) Connector type : DVI-D male with DDC-2B pin assignments

White connector thumb-operated jack screws

Pin Assignment:

Pin No. Description

1 T.M.D.S. data22 T.M.D.S. data2+ 3 T.M.D.S. data2 shield 4 No Connect 5 No Connect 6 DDC clock 7 DDC data 8 No Connect

9 T.M.D.S. data110 T.M.D.S. data1+ 11 T.M.D.S. data1 shield 12 No Connect 13 No Connect 14 +5V Power 15 Ground (for +3.3V) - Cable detect 16 Hot plug detect 17 T.M.D.S. data018 T.M.D.S. data0+ 19 T.M.D.S. data0 shield 20 No Connect 21 No Connect 22 T.M.D.S clock shield 23 T.M.D.S. clock+ 24 T.M.D.S. clock-

3.2.3 OSD Function Control Philips follow up HP

s requirement to create OSD function and HP approve the OSD function. If any deviation between SHT590 and customer specification and really product, production should follow up really product.

OSD (On Screen Display) function

(1) Analog interface OSD:

a. Basic OSD Menu Levels

Analog Mode Menu

Menu LEVEL 1 Menu LEVEL 2 Brightness ADJ Scale Contrast ADJ Scale Auto Adjustment Advanced Menu Exit

Go to cover page

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 58

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HP L1940

Digital Mode Menu

Menu LEVEL 1 Menu LEVEL 2 Brightness ADJ Scale Contrast ADJ Scale Advanced Menu Exit

Brightness & Contrast : brightness and contrast adjustment Auto Adjustment : Auto Adjustment Function Advanced Menu : Enter Advanced Menu Levels

a. Advanced OSD Menu Levels

Analog Mode Menu Menu Level 1 Menu Level 2 Menu Level 3 Brightness ADJ Scale Contrast ADJ Scale Image Control Auto Adjustment

(

Adjusting message ) Horizontal Position ADJ Scale Vertical Position ADJ Scale Clock ADJ Scale Clock Phase ADJ Scale Cancel Save and Return

Color 9300 K

6500 K Custom Color Custom Color ADJ sRGB Cancel Save and Return

Language Deutsch

S-Chinese English Espanol Francais Italiano Nederlands Cancel Save and Return

Management Power Saver On / Off Selection

Power On Recall On / Off Selection Mode Display On / Off Selection Sleep Timer Timer Set Menu Default Video Input - Analog - VGA

- Digital - DVI Serial Number Display Monitor S/N Basic Menu Cancel Save and Return

OSD Control Horizontal OSD Position ADJ Scale

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 59

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

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Jacky Lee

Vertical OSD Position ADJ S cale

OSD Timeout ADJ Scale Cancel Save and Return

Information Current Settings

Recommended Settings Serial Number Total Hours Backlight Hours Exit

Factory Reset Yes

Exit

Digital Mode Menu

Menu Level1 Menu Level2 Menu Level3 Brightness ADJ Scale

ContrastADJ Scale Color 9300 K

6500 K Custom Color Custom Color ADJ sRGB

Cancel Save and Return

Language Deutsch

S-Chinese English Espanol Francais Italiano Nederlands Cancel Save and Return

Management Power Saver On / Off Selection

Power On Recall On / Off Selection Mode Display On / Off Selection

Sleep Timer Timer Set Menu Default Video Input - Analog-VGA

- Digital - DVI Serial Number Display Monitor S/N BasicMenu Cancel Save and Return

OSD ControlHorizontal OSD Position ADJ Scale

Vertical OSD Position ADJ S cale OSD Timeout ADJ Scale Cancel Save and Return

Information Current Settings

Page 60

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HP L1940

Recommended Settings Serial Number Total Hours Backlight Hours Exit

Factory Reset Yes

Exit

a. OSD Service Mode Menu

Analog Mode Menu Menu Level 1 Menu Level 2 Menu Level 3 Brightness ADJ Scale Contrast ADJ Scale Image Control Auto Adjustment

(

Adjusting message ) Horizontal Position ADJ Scale Vertical Position ADJ Scale Clock ADJ Scale Clock Phase ADJ Scale Cancel Save and Return

Color 9300 K

6500 K Custom Color Custom Color ADJ sRGB Cancel Save and Return

Service Display Hours

Reset Total Hours Confirm Reset Reset Backlight Hours Confirm Reset Copy All Settings Confirm Reset Recall All Settings Confirm Reset Display White Block Unlock EDID Write Cancel Save and Return

Management Power Saver On / Off Selection

Power On Recall On / Off Selection Mode Display On / Off Selection Sleep Timer Timer Set Menu Default Video Input - Analog - VGA

- Digital - DVI Serial Number Display Monitor S/N Basic Menu Cancel Save and Return

OSD Control Horizontal OSD Position ADJ Scale

Vertical OSD Position ADJ Scale

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 61

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

OSD Timeout ADJ Scale

Cancel

Save and Return

Information Current Settings

Recommended Settings

Serial Number

Total Hours

Backlight Hours

Exit

Factory Reset Yes

Exit

Digital Mode Menu

Menu Level1 Menu Level2 Menu Level3

Brightness ADJ Scale

ContrastADJ Scale

Color9300K

6500 K

Custom Color Custom Color ADJ

sRGB

Cancel

Save and Return

ServiceDisplay Hours

Reset Total Hours Confirm Reset

Reset Backlight Hours Confirm Reset

Copy All Settings Confirm Reset

Recall All Settings Confirm Reset

Display White Block

Unlock EDID Write

Cancel

Save and Return

Management Power Saver On / Off Selection

Power On Recall On / Off Selection

Mode Display On / Off Selection

Sleep Timer Timer Set Menu

Default Video Input - Analog-VGA

- Digital - DVI

Serial Number Display Monitor S/N

BasicMenu

Cancel

Save and Return

OSD ControlHorizontal OSD Position ADJ Scale

Vertical OSD Position ADJ Scale

Page 62

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HP L1940

OSD Timeout ADJ Scale Cancel Save and Return

Information Current Settings

Recommended Settings Serial Number Total Hours Backlight Hours Exit

Factory Reset Yes

Exit

3.3 Timing requirement

3.3.1Mode storing capacity (1) Factory preset modes : 15 (2) User modes : 10

3.3.2Factory preset timings The factory settings of size and centering are according to the reference timing charts

(See Fig-7, Fig-8)

MODE NO. 1 2 3 4

RESOLUTION 640 x 480 640 x 480 640 x 480 720 x 400

Dot

clock(MHz)

25.175 31.500 31.501 28.321

f h 31.5kHz 37.861kHz 37.5kHz 31.468kHz A ( us ) 31.778(800 dots) 26.413(832 dots) 26.667 (840 dots) 31.78(900dots) B ( us ) 3.813( 96 dots) 1.270(40 dots) 2.032 ( 54 dots) 3.813(108dots) C ( us ) 1.907( 48 dots) 3.810(120 dots) 3.81 ( 120 dots) 1.907(54dots) D ( us ) 25.422( 640 dots) 20.317(640 dots) 20.317 (640 dots) 25.42(720dots) E ( us ) 0.636( 16 dots) 1.016(32 dots) 0.508 ( 26 dots) 0.636(18dots)

f v 60Hz 72.809Hz 75Hz 70Hz(70.085)

O (ms ) 16.683 (525 lines) 13.735(520 lines) 13.333 (500 lines ) 14.27(449 lines) P ( ms ) 0.064 ( 2 lines) 0.079(3 lines) 0.08 ( 3 lines ) 0.064(2 lines) Q (ms ) 1.049 ( 33 lines) 0.528(20 lines) 0.427 ( 16 lines ) 1.112(34 lines)

R ( ms ) 15.253 (480 lines) 12.678(480 lines) 12.8 (480 lines ) 12.71(400 lines)

S ( ms ) 0.317 ( 10 line ) 0.45(17 lines) 0.026 ( 1 lines) 0.381(13 lines) SYNC. H/V - / - -/- - / - -/+ POLARITY

SEP . SYNC Y Y Y Y

MODENO.5678

RESOLUTION 800 x 600 800 x 600 800 x 600 832 x 624

Dot clock(MHz) 40 50 49.498 57.28

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 63

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

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f h 37.9kHz 48.077kHz 46.9kHz 49.7kHz

A(us ) 26.4 (1056 dots) 20.80 (1040dots) 21.333 (1056

dots)

20.11(1152 dots)

B (us ) 3.2 ( 128 dots) 2.400 ( 120 dots) 1.616 ( 80 dots) 1.117(64 dots)

C(us ) 2.2 ( 88 dots) 1.280 ( 64 dots) 3.232 ( 160 dots) 3.91(224 dots) D(us ) 20 ( 800 dots) 16.00 ( 800 dots) 16.162 ( 800 dots) 14.52(832 dots) E(us ) 1 ( 40 dots) 1.120 ( 56 dots) 0.323 ( 16 dots) 0.563(32 dots)

f v 60Hz 72Hz ( 72.188) 75Hz 75Hz

O(ms ) 16.579 (628 lines) 13.85 (666 lines) 13.333 (625 lines) 13.41(667 lines)

P ( ms ) 0.106 ( 4lines) 0.125 ( 6lines) 0.064 ( 3lines) 0.06(3lines)

Q (ms ) 0.607 ( 23 lines) 0.478 ( 23 lines) 0.448 ( 21 lines) 0.784(39 lines)

R(ms ) 15.84 (600lines) 12.48 (600 lines) 12.8 (600 lines) 12.55(624 lines) S(ms ) 0.026 ( 1line ) 0.770 ( 37 line ) 0.021 ( 1line ) 0.016(1lines)

SYNC.H/V +/+ +/+ +/+ +/+

POLARITY

SEP.SYNC YY Y Y

MODE NO. 9 10 11 12

RESOLUTION 1024 x 768 1024 x 768 1024 x 768 1152 x 870

Dot

clock(MHz)

65 75 78.75 100

f h 48.363kHz 56.5kHz 60kHz 68.7kHz

A(us ) 20.677(1344

dots)

17.707(1328 dots)

16.66 (1312dots) 14.56 (1456 dots)

B (us ) 2.092(136 dots) 1.813(136 dots) 1.219 ( 96 dots) 1.28 ( 128 dots)

C(us ) 2.462(160 dots) 1.920(144 dots) 2.235 ( 176 dots) 1.44( 144 dots) D(us ) 15.754(1024

dots)

13.653(1024 dots)

13.003(1024 dots)

11.52 ( 1152 dots)

E(us ) 0.369(24 dots) 0.321 (24 dots) 0.203 ( 16 dots) 0.32 ( 32 dots)

f v 60.004Hz 70.004Hz 75Hz ( 75.000) 75Hz

O(ms ) 16.666(806 lines) 14.272(806 lines) 13.328 (800 lines) 13.322 (915

lines)

P ( ms ) 0.124(6lines) 0.106(6lines) 0.05( 3lines) 0.044 ( 3lines)

Q (ms ) 0.600(29 lines) 0.514(29 lines) 0.446 ( 28 lines) 0.568( 39 lines)

R(ms ) 15.880(768 lines) 13.599(768 lines) 12.80 (768 lines) 12.678 (870

lines)

S(ms ) 0.062(3lines) 0.053(3lines) 0.017 ( 1line ) 0.043 ( 4line )

SYNC. H/V - / - -/- + / + - / -

POLARITY

SEP.SYNC YYY Y

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HP L1940

MODE NO. 13 14 15

RESOLUTION 1152 x 900 1280 x 1024 1280 x 1024

Dot clock(MHz) 105.56 108 117

f h 71.713kHz 64kHz 71.7kHz A ( us ) 13.945 (1472dots) 15.63 (1688 dots) 13.949 (1632 dots) B ( us ) 0.909 ( 96 dots) 1.037 ( 112 dots) 0.957 (112 dots) C ( us ) 1.970 ( 208 dots) 2.296 ( 248 dots) 1.915 (224 dots) D ( us ) 10.913 ( 1152 dots) 11.852 ( 1280 dots) 10.94 (1280 dots) E ( us ) 0.152 ( 16 dots) 0.445 ( 48 dots) 0.137 (16 dots)

f v 76Hz 60Hz 75Hz

O (ms ) 13.15 (943 lines) 16.661 (1066

lines)

14.883 (1067lines)

P ( ms ) 0.112 ( 8 lines) 0.047 ( 3 lines) 0.112 ( 8 lines)

Q (ms ) 0.46 ( 33 lines) 0.594 ( 38 lines) 0.46 ( 33 lines)

R ( ms ) 12.55 (900 lines) 16.005 (1024

lines)

14.283 (1024 lines)

S ( ms ) 0.028 ( 2 lines) 0.015 ( 1 line) 0.028 (2 lines ) SYNC. H/V - / - + / + + / + POLARITY

SEP . SYNC Y Y Y

A : H-Total O : V-Total

B : H- Sync width P : V- Sync width

C : H- Back porch Q : V- Back porch

D : H- Video width R : V- Video width

E : H- Front porch S : V- Front porch

3.3.3Horizontal scanning

Sync polarity : Positive or Negative Scanning frequency : 30 - 83 K Hz

3.3.4 Vertical scanning

Sync polarity : Positive or Negative Scanning frequency : 56 - 76 Hz

3.4 Power input connection

Power cord length : 1.8 M Power cord type : 3 leads power cord with protective earth plug.

3.5 Power management

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 65

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

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TYPE :EJ6B50/02

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STATUS H-syncV-syncVideo PowerLED indicator

On On On Active < 70W

Green LCD (*Note1)

Stand-by Off On Blanked <2W

AmberLCD

(*Note2)

Suspend On Off Blanked <2W

AmberLCD

(*Note2)

Off Off Off Blanked <2W

AmberLCD

(*Note2) DC Switch off

N/AN/AN/ A <1W Off (*Note 2)

Note 1: Included two activeexternal USB devices

Note 2: Measurement isrequired to connect PC via USB 2.0 upstream cable and be

without any external USB devices. Theoperating system isrequired to be Windows XP , and USB interfaceofPC shall conform to USB 2.0 compliance.

3.6 Display identification

3.6.1 Analog DDC In accordance withVESA Display Channel Standard V1.0 and having DDC-2B capability.

3.6.2 Digital DDC In accordance with DVI require

ment (DDWGdigital Visual Interface revision 1.0)use

DDC-2B and EDID 3.0 structure 2.0

4.0 Visual characteristics

4.1 Test conditions

Unless otherwise specified, thisspecification is defined under the followingconditions.

voltage: 120 VAC 60 Hz and 230 VAC 50 Hz

Video Signal: NativeResolution(1280x1024) @ 60 Hz, 0.7 V p-p

Warm up: Morethan 30 minuteswithfull white picture

Temperature:20°Cto25°C

Contrast: 100% setting (gain =1)

Brightness:100% setting

Color Temperature: 6500K Ambient Ligh

t: No ambient light(<10 lux)

Meter: Microvision ss230 (or equivalent)

4.2 Resolution Factory preset modes (15 modes)

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HP L1940

# Resolution H-Frequency

(Hz)

Pixel rate

(MHz)

V-Frequency

(Hz)

Comment

1 640X480 31.469K 25.175 59.940 VGA

2 640X480 37.861K 31.5 72.809 VESA

3 640X480 37.5K 31.501 75 VESA

4 720X400 31.469K 28.322 70.087 VGA

5 800X600 37.879K 40 60.317 VESA

6 800X600 48.077K 50 72.188Hz VESA

7 800X600 46.875K 49.498 75Hz VESA

8 832X624 49.726K 57.284 74.551Hz MAC

9 1024X768 48.363K 65 60.004Hz VESA

10 1024X768 56.476K 75 70.069Hz VESA

11 1024X768 60.023K 78.75 75.029Hz VESA

12 1152X870 68.68K 100 75.06Hz MAC

13 1152X900 71.71K 108 76.05Hz SUN

14 1280X1024 63.98K 108 60.02Hz VESA

15 1280X1024 79.97K 135 75.02Hz VESA

Note : 1. Screen displays perfect picture at 15 factory preset modes.

2. Screen displays visible picture when input modes are other then 15

preset modes

4.3 Average Surface Brightness Use OSD to set 6500K or sRGB color temperature in 1280x1024/60Hz

mode, measured by at screen center (position 5) with white pattern as Fig-1

Color Temperature Brightness control Contrast control Light output unit: nits

6500K 100% 100% >= 200

sRGB NA NA >=140

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 67

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

4.4 Brightness uniformity In 1280x1024/60Hz mode,set contrast at 100% and turnthe brightness to get

average above 200 nitswithwhite pattern.

The Brightness Variation shall be measured atthe 9centerpointsbyHPspec(at 10%, 50%, and 90%) called out in the Measur

ement Locations Figure 2below. IfLight Leakageisvisible, the Maximum Dark Luminance shall be measured at all 11 points (9-pointsplus4-pointsatthe center of each edge).

Minimumluminanceof nine p

oints (brightness)

x100 % >= 70%

Maximumluminanceof nine points (brightness)

4.5 Check Cross talk

Cross talk of one area of the screen by another shall be measured by comparing the brightness (YA)of a10mm

1mmdiameterarea, withalldisplay pixels set to the 32nd (of0to 63) gray level, to the

brightness (YB)of that same areawhen anyadjacent area is driven darkasfig6. The luminance ratio shall not exceed 1:2.0

Cross Modulation Ratio =

Y-Y

<=2.0 (Max)

4.6 White coloradjustment

There arethree factory preset white color 9300K, 6500K and sRGB. Apply full white pattern,withbrightness in 90 % position and the contrast controlat 80 % position. The 1931 CIE Chromaticity (colo

r triangle) diagram (x,y) coordinate for the screen centershould be:

9300K CIE coordinates X = 0.283

0.020

Y = 0.297

0.020

6500K CIE coordinatesX=original panelcolor

Y=original panelcolor

sRGB CIE coordinates X = 0.313

0.020

Y = 0.329

0.020

5.0 Mechanical characteristics

5.1 Controls

Front side:

DC powerswitch OSD Menu key Minus

(hot-keyforselection of theDVIinput)

Plus

( hot-keyforselection of the VGA)

Auto Key

Rear side:

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HP L1940

D-SUB signal connector

DVI signal connector Power cord socket Upstream Port Two downstream ports

5.2 Unit dimension / Weight

Set dimension (incl. pedestal): 413(W) * 477(H) * 265(D) mm

Net weight. : 8.4 kg

5.3 Tilt and swivel base

Basic base:

tilt angle : -5 ° to +35 ° ( operation )

swivel rotation : ± 90°

5.4 Transportation packages

5.4.1 Shipping dimension/Weight

Carton dimension. : 524(W) * 239(D) * 513(H) mm Gross weight. : 10 Kg

5.4.2 Block unit / Palletization It use two kind of pallets, which mixed into container (please sheet sheet 560)

A type pallet:

layers / block

sets/layer sets/block unit

41040 blocks/container 20 feet 40 feet

920

6.0 Environmental characteristics

6.1 Susceptibility of display to external environment

6.1.1 Temperature Ranges

Operating Temperature (Independent of altitude) : 5 C to 35 C.

Non-Operating Temperature (Independent of altitude) : -20 C to 60 C.

6.1.2 Humidity

Operating (non-condensing) : 20% to 80%

Non-Operating (38.7 C maximum wet bulb temperature) : 5% to 90%

6.1.3 Altitude

Operating 0 to 12,000 feet [3,658 m]. Equivalent to 14.7 to 10.1 psia.

Non-Operating 0 to 40,000 feet [12,192 m]. Equivalent to 14.7 to 4.4 psia

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 69

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

6.2 Transportation tests

6.2.1 Drop

To measuretheG-values, theinstrumentation shall be placed on the center of the vesa plate of the Base.

Standard HP Spc.109291

Height 76 cm

2corner

Drop Sequence 2 edge

Test 6face

electrical function ok

Test mechanical function ok

Resultnoserious damageonset appearance

6.2.2 Vibration and Shock

Product shall meet theoperating, non-operatingand pack test requirements ofHP

s specification forMonitor Environmental and Reliability Testing (rev6.0of Oct. 21, 2002). Drop heights shall be determined by Compaq specification 109291.

All testing shall be done in each of three mutually perpendicular axes, referenced to th

position of the systemasit is in front of theuser (i.e., front-to-back, side-to-side,and top-to-bottom).

6.2.3 Operating Conditions

The unit should suffer no visible cosmetic damage and shouldoperate with no degradation in display quality during exposuretotheoperational conditions.

Sinusoidal Vibration:0.25gzero-to-peak, 10 to 500 Hz, 0.25 octave /minute sweeprate. One sweep, 10 to 500 to 10 Hz, along each axis.

RandomVibration: 0.002 G2/Hz, 10 to 500 Hz, nominal 1.0 Grms in each of thethree axes. T

hetestduration shall be sufficient sothatthe monitor's performance can be completely

evaluated.

Half Sine WaveShock: 30 G peak acceleration for2milliseconds duration in each of the three axes. Thenumber ofshock inputs

in each direction shall be sufficient sothe monitor's

performance can beevaluated.

6.2.4 Non-Operating

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HP L1940

The unit should suffer minimal visible cosmetic damage or damage that presents a safety hazard, or impairs the setup and operation of the system after testing.

Sinusoidal Vibration: 0.75 G zero-to-peak, 10 to 500 Hz, 0.5 octave / minute sweep rate. This requires one sweep, 10 to 500 to 10 Hz, along each of the three axes.

Random Vibration: 0.008 G2/Hz, 10 to 500 Hz, nominal 2 GRMS. The test shall be for one hour for each of the three axes.

Half Sine Wave Shock: 50 G peak, half sine pulse, 2 ms pulse duration. Testing shall consist of one shock in each direction in each axis, for a total of 6 shock inputs.

Square Wave Shock: 35 G peak acceleration, 180 inches / second velocity change. There shall be one shock in each direction in each axis, for a total of 6 shock inputs.

6.3 Display disturbances from external environment According to IEC 801-2 for ESD disturbances

7.0 Reliability

7.1. Mean Time Between Failures System MTBF (Excluding the LCD panel and CCFL): 75,000 hrs

CCFL MTBF: The lamps shall have a continuous operating life of at least 50,000 hours

at 25 C. The operating life is defined as having ended when the illumination of light has reached 50% of the initial value. In addition to the minimum 50% luminance at 50,000 hours, the backlights must also meet the requirement of minimum 65% at 26,000 hours.

8.0 Quality assurance requirements

8.1 Acceptance test According to MIL-STD-105D Control II level

AQL: 0.65 (major)

2.50 (minor)

(Please also refer to annual quality agreement)

Customer acceptance criteria: UAW0377/00

9.0 Serviceability

The serviceability of this monitor should fulfill the requirements, which are prescribed in UAW0346 and must be checked with the check list UAT-0361.

10.0 Defects

Both of HP & Philips agree to follow up panel specification as inspection condition in business kick

off stage, if any deviation between Sheet590 and customer specification, should follow up panel specification.

10.1 Visual Inspection

The LCD panel shall be inspected with all pixels set to white, black, red, green, and blue. The color variation,

brightness variation and overall appearance must not be perceived as poor quality by Hewlett-Packard. Areas

and/or parameters considered questionable shall be

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 71

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

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subjected to detailed measurements.

10.2 Mechanical Light Leakage

Except for the activedisplay area, there shall benolightemission visible fromanyangle fromany other partof thedisplay. For this te

st, the ambient illumination must be less than 10 lux. Withadark (no video) image, there shall benoareas ofvisibleillumination/light leakage(excludingpixel defectsspecified separately).

10.3 Allowabl

eDefects

No cosmetic defectsare allowed exceptthose specified below. The conditions ofvisual inspectionsare as

follows:

Viewing distanceis to be approximately 35 cm.

Ambient illumination is to

be 300 to 500 lux.

Viewingangle range shall be 70-110 degreeshorizontal and 80-100 degreesvertical.

Defects not apparent within one minute shall beignored.

10.4 Defect Limits

Table 3lists the countable and rejectable s

izesfor each typeofcommonly found defects. Defectswithin the countable size are allowed;however, the total number ofcountabledefects shall not exceed the maximum number ofallcountabledefects noted in thetable

. Any defect with dimensionsgreater thanthe countabledefect shall be sufficient cause forrejecting the

display. The symbols used are: D = Diameter,L=Length (longestdimension),W=Width (perpendi

cular to the length), N =

Number or Count, Spot = Contamination, S = Separation from EdgetoEdge, Dot = Subpixelstuck on/off (electrical).

TABLE 3

OPTO-MECHANICAL DEFECTS

VISUAL DEFECTS: (See

Notes)

COUNT REJ ECT

Dark/White Spot

0.25 < D £ 0.60, N £ 3

D > 0.60 or N >3

Bright Line (Light Lint)

0.03 < W £ 0. 2, L £ 3.0, N £ 4

W > 0.2 or L > 3.0 or N >4

Dark Line (Dark Lint/Hair)

0.03 < W £ 0.2, 0.3 < L £ 3.0, N £ 4

W > 0.2 or L > 3.0 or N >4

Polarizer Scratch

0.01 < W £ 0.07, 1.0 < L £ 10.0, N £ 3

W > 0.07 or L > 10.0 or N >3

Polarizer Dents

0.15 < D £ 0.6, N £ 3

D > 0.6 or N >3

PolarizerBubble

0.254 < D £ 0.6, N £ 3

D > 0.6 or N >3

Rubbing Defects Not Allowed

Newton Rings Not Allowed

Mottling Not Allowed

ELECTRICAL DEFECTS: (See Notes)

BrightSub-Pixel (Electrical) N =3

(MVA/PVA/IPS panels normally dark)

N >3

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HP L1940

Dark Sub-Pixel (Electrical)

N £ 5

N>5

Bright and Dark Sub-Pixel

(Total)

N £ 5

N>5

Minimum Distance Between Electrical Defects

Bright Dots

S ³ 15

S<15

Two Adjacent Dots

(Bright/Bright, Bright/Dark,

Dark/Dark, Any Plane)

N £ 1 pair

N > 1 pair

Bright and/or Dark Dots:

Three Adjacent (Any

Plane)

Not Allowed Not Allowed

Dark Dots

S ³ 15

S<15

Dim Lines Not Allowed

Cross Line(s) On/Off Not Allowed

Horizontal Line(s) On/Off Not Allowed

Vertical Lines(s) On/Off Not Allowed

Minimum Distance

Between ANY Allowable

Defects

S ³ 15

S<15

Maximum No. of Allowable

Defects

N £ 5 (all types)

N>5

Notes:

Any bright or dark dots visible using the evaluation method described in section 6.6.4 are to be considered defects. Unless otherwise specified, optical defects whose length L is greater than four times the width W, that is L > 4W, shall be considered as linear defects. Defects whose length is less than four times the width (L < 4W) shall be considered as spot defects. All gray shade testing will be based on Shades 1, 12, and 16 for Black/White/Red/Green /Blue (from a base of 16 gray shades, where 16 is maximum bright and 1 is minimum bright). A high level dot cannot be adjacent to any other dot.

10.5 Smudges, Streaks and Smears

When viewing the panel oriented so as to maximize reflected light, there shall be no visible smudging, streaking, smearing or other non-uniformity from contaminants, fingerprints, or defects in any of the visible surfaces. This is independent of whether the unit is operating or off.

10.6 Mura and Splotchiness

When viewed from directly in front of the monitor, the display shall not exhibit any non-uniformity’s in color or

luminance that are readily visible at 25% gray scale or brighter. Mura

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 73

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

patternsmaybe visible when viewed from off-axis.

10.7 Optical Light Leakage

There shall not be visible light from the back-lighting systemaround theedges of the screen as seen froma distanceof20inchesfrom the screen withanoverhead light level of10lux. The manufacturer shall furnish

samples of the monitorwith each supported LCD module showing the maximumamount oflight leakage. This sample shall be con

sidered the worst case light leakage sample and all panels used forproduction shall

have alesseramount oflight leakage.

10.9 LCD Inspection

Put LCD panel on inspection table and illuminate the panelwithadaylight fluorescent lamp located abovethe panels

urface such thattheilluminance atthe LCD panel isbetween 1000 luxand 1500 lux. Defect limitsare

given in Table 3for the combined defectsfrom this inspection and theelectrical and mechanical de

fectsfrom

Table 4.

Table 4 DefectInspection

AverageDiameter

smaller of (L+W)/2 or L/20+2W

Acceptable

Number

Minimum

separation

<0.1mm Non countableN/a

0.1 mm 0.3 mm

10 15 mm

0.31 mm 0.5 mm

10 15 mm

0.51 mm 1.25 mm

515mm

1.26 mm 2.5 mm

3 25.4 mm

2.51 mm 3.75 mm

3 25.4 mm

Greater than 3.75 mm none Not applicable

Allowabledistance between spots of two sizes is the minimumseparation numberfor the smallerspot. Therefore, if there aretwo spots, 1.30 mm and 0.4 mm in diameter, theymust be at least 15 mm apart

11.0 USB 2.0 HUB

TheUSBhub shall be powered by the internal supply of the monitor. The communication protocolshallcomply with USBspecification revision 2.0. A singleupstream connector shall serve as connection to theCPUor other USBhub. Each of the 2 downstream ports shall include current-limited power of5VDC at 500mA for use by an attached device.

USB Signals USBsignals shall meet thetimingand signal levelstandardsforhi

gh speed devicesset forthbyindustry standardUSBspecification revision 2.0. Each downstream port shall provide 5VDC atup to 500mA for use by an attached USB device.

Communication Protocol USBconnections shall bees

tablished via4-conductor USB cables. USB cablesmust be shielded in

accordance with theUSBspecification forhigh speed devices.

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HP L1940

Protocol Parameters The USB hub and associated ports shall be compliant with the USB specification for high speed devices. The USB device speed shall be 480 Mbit/sec. The maximum polling rate shall be every 256 ms.

Fig 1: Average Surface Brightness ,Position 5 = Screen center point

W/10

L/10

L/2

W/2

456

Fig-2 HP Uniformity Test Pattern

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 75

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Fig-4 CMOUniformity Test Pattern

Fig-5 AUO Uniformity Test Pattern

Fig-3 LPL Uniformity Test Pattern

H/4

V/4

Active Area

H : 376.320 mm V : 301.056 mm @ H,V : Active Area

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HP L1940

Fig-6 HP Cross Talk Test Pattern

VIEW AREA

(896,384)

768,192

768,576

192

576

(896,384)

Darkest gray pattern

Where: In addition:

YA= Initial luminance of measured

area (cd/m2)

Viewing Angle: qx=90°, qy=90°

YB= Subsequent luminance of

measured area (cd/m2)

Ambient Temperature: 25 ±2°C

The location measured will be exactly the same in both patterns.

Measurement Area Size: 2° field of view at 40 cm

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 77

HP L1940

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GENERALPRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE :EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Fig-7 Timing Chart-1

VIDEO

SEPARA TE SY NC.

HORIZONTAL

VIDEO

VERTICAL

HORIZONTAL

COMPOSITE SYNC.

FIG -4 T IM IN G C H A R T -1

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HP L1940

Fig-8 Timing Chart-2

VIDEO

VERTICAL

COMPOSITE SYNC.

FIG-5 TIMING CHART -2

QR S

&VIDEO

( SYNC. ON GREEN )

HORIZONTAL

VERTICAL

GENERAL PRODUCT SPECIFICATION(Continued)

BRAND : HP L1940

19 inch LCD Monitor

TYPE : EJ6B50/02

8639 000 15804

2004-08-31

590

Jacky Lee

Page 79

DDC Data

Go to cover page

(FOR HP L1940 DIGITAL FOR LPL PANEL) ********************************************************************* EDID log file *********************************************************************

Vendor/Product Identification

ID Manufacturer Name : HWP ID Product Code : 262F( ID Serial Number : 51303031 (HEX.) Week of Manufacture : 18 Year of Manufacture : 2004

EDID Version, Revision

Version : 1 Revision : 3

Basic Display Parameters/Features

Video Input Definition : Digital Video Input Maximum H Image Size : 38 Maximum V Image Size : 30 Display Transfer Characteristic: 2.2

(gamma)

Feature Support (DPMS) : Standby

Suspend

Active Off

Display Type : RGB color display

Standard Default Color Space : Primary color space

Preferred Timing Mode : Detailed timing block 1

Color Characteristics

Red X coordinate : 0.64 Red Y coordinate : 0.33 Green X coordinate : 0.3 Green Y coordinate : 0.6 Blue X coordinate : 0.15 Blue Y coordinate : 0.06 White X coordinate : 0.313 White Y coordinate : 0.329

Established Timings

Established Timings I : 720 x 400 @70Hz (IBM,VGA)

640 x 480 @60Hz (IBM,VGA) 640 x 480 @72Hz (VESA) 640 x 480 @75Hz (VESA) 800 x 600 @60Hz (VESA)

Established Timings II : 800 x 600 @72Hz (VESA)

800 x 600 @75Hz (VESA) 832 x 624 @75Hz (Apple, Mac II) 1024 x 768 @60Hz (VESA) 1024 x 768 @70Hz (VESA) 1024 x 768 @75Hz (VESA)

Manufacturer's timings:

Standard Timing Identification #1

Horizontal active pixels : 1280 Aspect Ratio : 5:4 Refresh Rate : 60

HEX.)

1280 x 1024 @75Hz (VESA)

1152 x 870 @75Hz (Apple,Mac II)

Detailed Timing #1

Pixel Clock (MHz) : 108 H Active (pixels) : 1280 H Blanking (pixels) : 408 V Active (lines) : 1024 V Blanking (lines) : 42 H Sync Offset (F Porch) (pixels): 48 H Sync Pulse Width (pixels) : 112 V Sync Offset (F Porch) (lines) : 1 V Sync Pulse Width (lines) : 3 H Image Size (mm) : 338 V Image Size (mm) : 270 H Border (pixels) : 0 V Border (lines) : 0 Flags : Non-interlaced

: Normal Display, No stereo : Digital Separate sync. : Positive Vertical Sync. : Positive Horizontal Sync.

Monitor Range Limits Min. Vt rate Hz : 56 Max. Vt rate Hz : 76 Min. Horiz. rate kHz : 30 Max. Horiz. rate kHz : 83 Max. Supported Pixel : 140 No secondary GTF timing formula supported.

Serial Number : TWP318Q001

Monitor Descriptor #2

Monitor Descriptor #3

Monitor Name : hp L1940

Monitor Descriptor #4

Extension Flag : 0

Check sum : FA(HEX.)

********************************************************************** EDID data (128 bytes) **********************************************************************

0: 00 1: ff 2: ff 3: ff 4: ff 5: ff 6: ff 7: 00

8: 22 9: f0 10: 2f 11: 26 12: 31 13: 30 14: 30 15: 51 16: 12 17: 0d 18: 01 19: 03 20: 80 21: 26 22: 1e 23: 78 24: ee 25: ee 26: 95 27: a3 28: 54 29: 4c 30: 99 31: 26 32: 0f 33: 50 34: 54 35: ad 36: ef 37: 80 38: 81 39: 80 40: 01 41: 01 42: 01 43: 01 44: 01 45: 01 46: 01 47: 01 48: 01 49: 01 50: 01 51: 01 52: 01 53: 01 54: 30 55: 2a 56: 00 57: 98 58: 51 59: 00 60: 2a 61: 40 62: 30 63: 70 64: 13 65: 00 66: 52 67: 0e 68: 11 69: 00 70: 00 71: 1e 72: 00 73: 00 74: 00 75: fd 76: 00 77: 38 78: 4c 79: 1e 80: 53 81: 0e 82: 00 83: 0a 84: 20 85: 20 86: 20 87: 20 88: 20 89: 20 90: 00 91: 00 92: 00 93: fc 94: 00 95: 68 96: 70 97: 20 98: 4c 99: 31 100: 39 101: 34 102: 30 103: 0a

104: 20 105: 20 106: 20 107: 20 108: 00 109: 00 110: 00 111: ff 112: 00 113: 54 114: 57 115: 50 116: 33 117: 31 118: 38 119: 51 120: 30 121: 30 122: 31 123: 0a 124: 20 125: 20 126: 00 127: fa

HP L1940

Page 80

DDC Data

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THE DISPLAY DATA CHANNEL (DDC_2B) CONTENT INCLUDING: (FOR HP L1940 ANALOG FOR LPL PANEL) ********************************************************************* EDID log file *********************************************************************

Vendor/Product Identification

ID Manufacturer Name : HWP ID Product Code : 262E( ID Serial Number : 51303031 (HEX.) Week of Manufacture : 18 Year of Manufacture : 2004

EDID Version, Revision

Version : 1 Revision : 3

Basic Display Parameters/Features

Video Input Definition : Analog Video Input

0.700V/0.000V (0.70 Vpp) Without Blank-to-Black Setup

Separate Sync Without Composite Sync Without Sync on Green No Serration required

Maximum H Image Size : 38 Maximum V Image Size : 30 Display Transfer Characteristic: 2.2

(gamma)

Feature Support (DPMS) : Standby

Suspend

Active Off

Display Type : RGB color display

Standard Default Color Space : Primary color space

Preferred Timing Mode : Detailed timing block 1

Color Characteristics

Established Timings

Established Timings I : 720 x 400 @70Hz (IBM,VGA)

640 x 480 @60Hz (IBM,VGA) 640 x 480 @72Hz (VESA) 640 x 480 @75Hz (VESA) 800 x 600 @60Hz (VESA)

Established Timings II : 800 x 600 @72Hz (VESA)

800 x 600 @75Hz (VESA) 832 x 624 @75Hz (Apple, Mac II) 1024 x 768 @60Hz (VESA) 1024 x 768 @70Hz (VESA) 1024 x 768 @75Hz (VESA)

Manufacturer's timings:

Standard Timing Identification #1

Horizontal active pixels : 1280 Aspect Ratio : 5:4 Refresh Rate : 60

HEX.)

1280 x 1024 @75Hz (VESA)

1152 x 870 @75Hz (Apple,Mac II)

Detailed Timing #1

: Normal Display, No stereo : Digital Separate sync. : Positive Vertical Sync. : Positive Horizontal Sync.

Monitor Range Limits Min. Vt rate Hz : 56 Max. Vt rate Hz : 76 Min. Horiz. rate kHz : 30 Max. Horiz. rate kHz : 83 Max. Supported Pixel : 140 No secondary GTF timing formula supported.

Serial Number : TWP318Q001

Monitor Descriptor #2

Monitor Descriptor #3

Monitor Name : hp L1940

Monitor Descriptor #4

Extension Flag : 0

Check sum : 13 (HEX.)

********************************************************************** EDID data (128 bytes) **********************************************************************

0: 00 1: ff 2: ff 3: ff 4: ff 5: ff 6: ff 7: 00

8: 22 9: f0 10: 2e 11: 26 12: 31 13: 30 14: 30 15: 51 16: 12 17: 0d 18: 01 19: 03 20: 68 21: 26 22: 1e 23: 78 24: ee 25: ee 26: 95 27: a3 28: 54 29: 4c 30: 99 31: 26 32: 0f 33: 50 34: 54 35: ad 36: ef 37: 80 38: 81 39: 80 40: 01 41: 01 42: 01 43: 01 44: 01 45: 01 46: 01 47: 01 48: 01 49: 01 50: 01 51: 01 52: 01 53: 01 54: 30 55: 2a 56: 00 57: 98 58: 51 59: 00 60: 2a 61: 40 62: 30 63: 70 64: 13 65: 00 66: 52 67: 0e 68: 11 69: 00 70: 00 71: 1e 72: 00 73: 00 74: 00 75: fd 76: 00 77: 38 78: 4c 79: 1e 80: 53 81: 0e 82: 00 83: 0a 84: 20 85: 20 86: 20 87: 20 88: 20 89: 20 90: 00 91: 00 92: 00 93: fc 94: 00 95: 68 96: 70 97: 20 98: 4c 99: 31 100: 39 101: 34 102: 30 103: 0a

104: 20 105: 20 106: 20 107: 20 108: 00 109: 00 110: 00 111: ff 112: 00 113: 54 114: 57 115: 50 116: 33 117: 31 118: 38 119: 51 120: 30 121: 30 122: 31 123: 0a 124: 20 125: 20 126: 00 127: 13

HP L1940

Page 81

Different Parts List

HPL1940

Diversityof EJ6B50-69 comparingwith EJ6B50-02

Item 12NC Description

863900015805 EJ6B50-69 0101 313810440571 HOUSING COVER 1157 313812874901 MAINSCORD

Diversityof EJ6B50-76 comparingwith EJ6B50-02

Item 12NC Description

863900015801 EJ6B50-76 0101 313810440571 HOUSING COVER 1157 313812874901 MAINSCORD

Page 82

TELEVISION/MONITOR SAFFTY GUIDELINES FOR THE PROFESSIONAL SERVICE TECHNICIAN

Safety Checks

Fire and Shock Hazard

Implosion

X-radiation

After the original service problem has been corrected,a complete safety check shouldbemade.Besuretocheckovertheentireset,notjusttheareas where you have worked. Some previous servicer may have left an unsafe condition,which could be unknowingly passed on to your customer. Be sure tocheckallofthefollowing:

1. Be sure all components are positioned in such a way as to avoid the possibility of adjacent component shorts. This is especially important on those chassis which are transported to and from the service shop.

2. Never release a repaired unit unless all protective devices such as

insulators, barries, covers, strain reliefs, and other hardware have been installed in accordance with the original design.

3. Solderingandwiringmustbeinspectedtolocatepossiblecoldsolder

joints,solder splashes,sharp solder points, frayed leads, pinched leads,

or damaged insulation ( including the ac cord).Be certain to remove

loose solder balls and all other loose foreign particles.

4. Check across-the-line components and other components for physical

evidence of damage or deterioration and replace if necessary. Follow original layout,lead length, and dress.

5. No lead or component should touch a receiving tube or a resistor rated

at1wattormore.Leadtensionaroundprotrudingmetalsurfacesor edges must be avoided.

6. Critical components having special safety characteristics are identified

withansbytheRef.No.inthepartslistandenclosedwithinabrokenline

* (where several critical components are grouped in one area) along with

the safety symbols on the schematic diagrams and/or exploded views.

7. When servicing any unit, always use a separate isolation transformer forthechassisFailuretouseaseparateisolationtransformermay expose you to possible shock hazard, and may cause damage to servicing instruments.

8. Many electronic products use a polarized ac line cord (one wide pin on theplug.)Defeatingthissafetyfeaturemaycreateapotentialhazardto theserviceandtheuser.Extensioncordswhichdonotincorporatethe polarizing feature should never be used.

9. After reassembly of the unit, always perform an leakage test or resistance testfromthelinecordtoallexposedmetalpartsofthecabinet.Alsocheck all metal control shafts(with knobs removed), antenna terminals, handles, screws,etc.tobesuretheunitmaybesafetyoperatedwithoutdangerof electrical shock.

*Brokenline

1. All picture tubes used in current model receivers are equipped with an

integral implosion system. Care should always be used, and safety glasses worn,whenever handling any picture tube. Avoid scratching or

otherwise damaging the picture tube during installation.

2. Use only replacement tubes specified by the manufacturer.

1. Be sure procedures and instructions to all your service personnel cover

the subject of X-radiation. Potential sources of X-rays in TV receivers are the picture tube and the high voltage circuits. The basic precaution which must be exercised is to keep the high voltage at the factory recommended level.

2. ToavoidpossibleexposuretoX-radiationandelectricalshock,onlythe

manufacturer's specified anode connectors must be used.

3. It is essential that the service technician has an accurate HV meter availableatalltimes.Thecalibrationofthismetershouldbechecked periodically against a reference standard.

4. When the HV circuitry is operating properly there is no possibility of an xradiation problem. High voltage should always be kept at the

manufacturer's

ratedvalue-nohigher-foroptimumperformance.Everytimeacolorsetis

serviced, the brightness should be run up and down while monitoring the HV with a meter to be certain that the HV is regulated correctly and does not exceed the specified value. We suggest that you and your technicians review test procedures so that HV and HV regulation are always checked as

a standard servicing procedure, and the reason for this prudent routine is

clearly understood by everyone. It is important to use an accurate and

reliable HV meter. It is recommended that the HV recorded on each customer'sinvoice,whichwilldemonstrateaproperconcernforthe customer's safety.

5. When troubleshooting and making test measurements in a receiver with

a problem of excessive high voltage, reduce the line voltage by means of aVariactobringtheHVintoacceptablelimitswhiletroubleshooting.Do

WARNING OFF

SERVICE NOTE

Before removing the CRT anode cap, turn the unit and short the HIGH VOLTAGE to the CRT DAG ground.

The CRT DAG is not at chassis ground.

6. New picture tubes are specifically designed to withstand higher operathng voltages without creating undesirable X-radiation. It is strongly recommended that any shop test fixture which is to be used with the new higher voltage chassis be equipped with one of the new type tubes designed for this service. Addition of a permanently connected HV meter totheshoptestfixtureisadvisable.TheCRTtypesusedin thesenew

sets should never be replaced with any other types, as this may result in

excessive X-radiation.

7. It is essential to use the specified picture tube to avoid a possible X-diation problem.

8. MostTVreceiverscontainsometypeofemergency"HoldDown"circuitto prevent HV from rising to excessive levels in the presence of a failure mode. These various circuits should be understood by all technicians servicing them, especially since many hold down circuits are inoperative as long as the receiver performs normally.

1. Unplugtheaclinecordandconnectajumperbetweenthetwoprongsof

the plug.

2. Turn on the power switch.

3. Measuretheresistancevaluebetweenthejumperedacplugandall

exposed cabinet parts of the receiver, such as screw heads, antennas, andcontrolshafts.Whentheexposedmetallicparthasareturnpathto the chassis, the reading should be between 1 megohm and 5.2 megohms. Whentheexposedmetaldoesnothaveareturnpathto thechassis,the reading must be infinity. Remove the jumper from the ac line cord.

1. Donotuseanisolationtransformerforthistest.Plugthecompletely

reassembled receiver directly into the ac outlet.

2. Connect a 1.5k, 10w resistor paralleled by a 0.15uf. capacitor between

each exposed metallic cabinet part and a good earth ground such as a water pipe, as shown above.

3. Useanacvoltmeterwithatleast5000ohmsvoltsensitivitytomeasure the potential across the resistor.

4. Thepotentialatanypointshouldnotexceed0.75volts.Aleakagecurrent

tester may be used to make this test; leakage current must not exceed

0.5milliamps.Ifameasurementisoutsideofthespecifiedlimits,thereis apossibilityofshockhazard. Thereceivershouldberepairedand rechecked before returning it to the customer.

5. Repeat the above procedure with the ac plug reversed.( Note: An ac adapter is necessary when a polarized plug is used. Do not defeat the polarizing feature of the plug.)

The primary source of X-radiation in this television receiver is the picture tube. The picture tube utilized in this chassis is specially constructed to limit X-radiation emissions. For continued X-radiation protection, the replacement tube must be the same type as the original, including suffix letter, or a Philips approved type.

Many electrical and mechanical parts in Philips television sets have special safety related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. The use of a substitute part which does not have the same safety characteristics as the Philips recommended replacement part shown in this service manual may create shock, fire, or other hazards

Leakage Current Cold Check

Leakage Current Hot Check

Picture Tube Replacement

Parts Replacement

1500 ohm, 10W

0.15 uF

WATER PIPE EARTH GROUND

TO INSTRUMENTS EXPOSED METAL PARTS