AOC L1740 Service Manual

17" LCD Colour Monitor

Service

SH4 HP L1740

CJ6B50/76 CJ6B50/02

Horizontal frequencies

30 - 83 kHz

TABLE OF CONTENTS

Description Page Important Safety Notice---- -------------------------- 2 Technical Data --------------------------------------3~6 Installation/On Screen Display-------------------7~10 Warning Message-------------------------------------11 Factory Mode------------------------------------------12 Flat Panel adjust--------------------------------------13 Trouble shooting--------------------------------------14 Mechanical Instructions-------------------------15~16 Definition of pixel defects----------------------------17 Electrical Instructions---------------------------18~19 Failure mode of panel---------------------------------20 Display adjustment-----------------------------------21 Safety test requirements-----------------------------22

SAFETY NOTICE

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.

Description Page DDC Instructions/DATA-------------------------23~31 ISP Instructions---------------------------------32~34 Repair tips/Repair Flow chart------------------35~38 Wiring Diagram---------------------------------------39 Function Block----------------------------------------40 Scaler Diagram----------------------------------41~45 Scaler Board C.B.A------------------------------46~47 Control Diagram & C.B.A.----------------------------48 Power Diagram ----------.-----------------------49~54 Exploded View--------------------------------------- 55 Recommended/Spare parts list----------------56~58 General product specification------------------59~90 Different parts list------------------------------------91

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

REFER TO BACK COVER FOR IMPORTANT SAFETY GUIDELINES

Published by BCU Monitors Printed in Suzhou Copyright reserved Subject to modification F Nov .11 2004

3138 106 10438

HP L1740

Important Safety Notice

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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.

WARNING

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.

*BrokenLine

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.

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.)

Technical Data

HP L1740

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HP L1740

Technical Data(Continued)

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2. Electrical characteristics and performance Test signal and test method in accordance with test instructions sheet 161 of the product where applicable.

2.1 Actual display size: 337.920 x 270.336 mm

2.2 Resolution

1.Factory Preset modes (15 modes)

# Resolution H-Frequency

(Hz)

1 640X480 31.469K 25.175 59.940 Hz VGA

2 640X480 37.861K 31.5 72.809 Hz VESA

3 640X480 37.5K 31.501 75 Hz VESA

4 720X400 31.469K 28.322 70.087 Hz VGA

5 800X600 37.879K 40 60.317 Hz VESA

6 800X600 48.077K 50 72.188 Hz VESA

7 800X600 46.875K 49.498 75 Hz VESA

8 832X624 49.726K 57.284 74.551 Hz MAC

9 1024X768 48.363K 65 60.004 Hz VESA

10 1024X768 56.476K 75 70.069 Hz VESA

11 1024X768 60.023K 78.75 75.029 Hz VESA

12 1152X870 68.68K 100 75.06 Hz MAC

13 1152X900 71.71K 108 76.05 Hz SUN

Pixel rate

(MHz)

V-Frequency Comment

2.5

14 1280X1024 63.98K 108 60.02Hz VESA

15 1280X1024 79.97K 135 75.02Hz VESA

Over-scan Mode

16 640*480 43.269K 36.000 85.008Hz

Technical Data(continued)

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2.12

2.13

2.14

HP L1740

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Technical Data(Continued)

Installation

Rear Panel Components

No Component Function

1 AC power connector Connects the AC power cord to the monitor

2 USB downstream connectors Connects optional USB devices

to the monitor

3 USB upstream connector Connects the USB cable to the host

(computer or another USB hub)

4 DVI connector (available on

select models)

5 VGA connector Connects the VGA cable to the monitor

. Connects the DVI -D signal cable to the

monitor

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3. For analog operation, connect one end of the VGA signal

cable to the VGA connector on the monitor 1, and the other

end to the VGA connector on the computer 2.

Connecting the VGA Signal Cable

4. Connect the USB cable to the USB upstream connector on the monitor 1 and to a convenient USB connector on the computer 2.

Connecting the Power Cable

Connecting the USB Cable

HP L1740

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Front Pan el Controls

On Screen Display

No Control Function

1 Auto Adjust Activates the auto adjustment feature for optimum

image

2 Menu Opens the On-Screen Display (OSD) menu

3 – (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)

4 + (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

5 Power Turns the monitor on or off

BASIC OSD MENU LEVEL S

On Screen Display

ADVANCED OSD MENU LEVELS

Analog Mode Menu

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

Brightness ADJ Scale Y(90) Contrast ADJ Scale Y(80)

Image Control Auto Adjustment ( Adjusting message) Y (no FD)

Horizontal Position ADJ Scale Y (no FD) 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

Language Deutsch

S. Chinese English N (FD=English) Espanol Francais Italiano Nederlands 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)

HPL 1740

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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

HP L1740

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On Screen Display

Digital Mode Menu Menu Level 1 Menu Level 2 Menu Level 3 Factory Reset? Brightness ADJ Scale Y (90) Contrast ADJ Scale Y (80) Color 9300 K

6500 K Y(FD) Custom Color Custom Color ADJ SRGB Cancel Save and Return

Language Deutsch

S. Chinese English N (FD=English) Español Français Italiano Nederlands 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 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: Yes

Recommended Settings: Serial Number: Total Hours: Backlight Hours: Exit

Factory Reset Yes

Exit

NOTE:

Unless designated by “FD”, the original factory default settings

are identical to the user Factory Reset function.

Warning Message

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Item Attention Signals Display Time Condition

1 Input Signal out of Range See section power saver

2 No Input Signal See section power saver

3 Going to Sleep See section power saver

4 Adjusting Auto hot key or OSD menu function

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

6 Input Not Available DVI (Analog) switch to Analog (DVI) without sync

7 Check Video Cable See section power saver

Power saver

Power Saver - On Power Saver - Off Note

Quit signal with cable 1. System blank and show WM Going

Disconnect cable

to Sleep 3 sec then sleep.

1. System blank and show WM Check Video Cable 10 sec then moving about 50 sec.

2. Show WM Going to Sleep 3 sec then sleep.

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

1. System blank and show moving WM No Input Signal always.

1. System blank and show WM Check Video Cable 10 sec then

moving always.

Out of range 1

Out of range 2

Out of range 3

1. System blank and show moving WM Input Signal out of Range about 60

sec.

2. Show WM Going to Sleep 3 sec then sleep.

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

1. Show moving WM Input Signal out of Range 60 sec.

2. WM disappear after WM 60 sec.

3. IF push any key then repeat 1-2.

1. Show moving WM Input Signal out of Range 60 sec.

2. After moving WM 60 sec then show WM Going to Sleep 3 sec then sleep.

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

1. System blank and show moving WM Input Signal out of Range

always.

1. Show moving WM Input Signal out of Range 60 sec.

2. WM disappear after WM 60 sec.

3. IF push any key then repeat 1-2.

1. Show moving WM Input Signal out of Range 60 sec.

2. After moving WM 60 sec then show WM Going to Sleep 3 sec then sleep.

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

H<29.5 or H>92 or

90>H>82.5 or V<49or V>87 or Vtotal>=1200

DownScaling Ex. 1280x1024 (Only for HPL1530)

85Hz

HP L1740

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Lock/Unlock,Aging, Service/Factory Mode

Front control panel

To Lock/Unlock OSDfunction

The OSDfunction can be locked by pressing MANU button for

more than 10 seconds,the screen shows following windows for 3

seconds. Everytime when you press MANU OrAUTO

button, thismessage AppearsOnthe screen automatically.

The POWER & INPUThotkey are still functional for

POWER and INPUT expectively while OS

Locked OSDfunction can be released by pressing MANU button for more than 10 seconds. While press MANU button for OSDunlocked purpose, the screen will keep showing OSD LOCK OUTuntil OSDfunction unlocked and the windows screen

automatically showed .

" 5 "

"3"

D locked.

" 2 " "1 "

" 2 "

Access Factory Mode

Power off on the monitor, To hold Auto And +"+" buttons at the sametime, And press POWER button to power on the monitor. Press MANU button to bring up OSDmenufor

confirmation

Factory menu

Cursor can move on gray 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)

Gain-m : Minimum valueof User Gain Gain-M : Maximum valueof User Gain AUTO-SUB:TodoAuto color function when push Up key in white

Panel T

ype :Ifset this to 1,2,3,4,5 then systemwill force panel type

SCALER : Read/Write scaler register NVRAM :Read/Write eeprom address

"1"

" 4 "

pattern

to LG(QDI), CPT or AU). Set to other value will auto detect panel based on panel hardware.

Fig.1

SERVICE MODE

Press and hold the ManuPower off Into the service mode.Press Manubutton to bring up OSD menufor confirmation asbelow:

"2"

" 2 "

Power

-> on ,then

" 5 "

Flat Panel Adjust

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.

HP L1740

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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 L1740

Trouble shooting

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

ProblemPossible Cause Solution

Screen is blank. Power cord is

Image appears

blurred, indistinct, or too dark.

Image is not centered.

disconnected. Power switchonfront panel of the monitor is turned off. Video cable is improperlyconnected.

Screen blanking utility is active.

Brightness andcontrast are too low.

Position may need adjustment.

Connectthepower cord.

Press the front panel power button.

Connectthevideo cable properly. Refer to Setting Up th e Moni to r, for more information. Press anykey on the keyboard or movethe mouse to inactivate the screen blanking utility.

Press the Auto Adjust button on the front panel.Ifthis does not correcttheimage, press the Menu button to open the BasicOSDMenu, and adjust the brightness andcontrast scales as needed.

Press the Menubuttonto access the OSD menu. Select Image Control/ Horizontal Position or Vertical Position to adjust the horizontalorvertical position of the image.

Check Signal

Cable is displayed on screen.

Out ofRange.Set Monitor to 1280 x 1024 @ 60Hz is displayed on screen.

Monitor video cable is disconnected.

Video resolution and/or

refresh rate are set higher than what your

monitor supports.

Connectthe15-pin monitor video cable to the VGA connector on the computer, or, ifconnected, check the DVI-D signal cable to the DVI connector on the computer, or the VGA to DVI-I cabletotheVGA connector on the computer (DVI availa models only). Besurethat the computer power is off while connecting the video cable.

Restart your computer and enter Safe Mode.Change your settings to a supported setting (see FactoryPreset Display Modes table in Appen computer so that the new

settings takeeffect.

ble on select

dixB).Restart your

Front view

Back view

Mechanical Instruction

Fig.1

Fig.2

HPL 1740

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Fig.6

Step 1.Remove the base Remove the four screws as Fig.2.Fig.3

Step 2. Remove the front cover as Fig.4~8. a. Use thin "I" type screwdriver to open the clicks on top sides as Fig.4

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

c. Use thin "I" type screwdriver to open 4 clicks on left side as Fig.6

Fig.7

Fig.3

Fig.8

Step 3.Remove the back cover

Open the clicks and unscrew the screws as shown in Fig.8

and then remove the back cover as shown in Fig.9

Fig.5

Fig.4

Fig.9

HP L1740

Mechanical Instruction

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Step .4 Remove the Metal frame board remove the screws and then pull the metal frame with the direction as shown in Fig.10 Fig.11

Fig.10

Power board

Fig.11

Step 5. Remove the control , scaler and power board remove the screws and disconnect the connector as shown in Fig.11

Control board

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).

Definition of pixel defects

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.

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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.

HP L1740

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Electrical Instructions

Table1 Preset Mode Resolution

# Resolution H-Frequency

1 640X480 31.469K 25.175 59.940Hz VGA

2 640X480 37.861K 31.5 72.809Hz VESA 3 640X480 37.5K 31.501 75Hz VESA

4 720X400 31.469K 28.322 70.087Hz VGA

5 800X600 37.879K 40 60.317Hz 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

(Hz)

Pixel rate (MHz)

V-Frequency Comment

(TABLE1)

2.3 Input signal mode for over-scan modes

Table2 Over -scan Mode Resolution

# Resolution H-Frequency

(Hz)

16 640X480 43.269K 36.000 85.008Hz VESA

17 800x600 53.674K 56.250 85.061Hz VESA

18 1024x768 68.677K 94.500 84.997Hz VESA

19 1280x1024 91.146K 157.50 85.024Hz VESA

Pixel rate

(MHz)

V-Frequency Comment

Electrical Instructions

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 6500°K color temperature.

3.4 Adjustment ofWHITE-D for sRGB (B)

Apply a1280*1024 /60Hz signal withwhite pattern, then adjust

the R, G, B Sub- Gain,for t chromaticity(X,Y)co-ordinates andY Luminance shall be:

x(center) 0.3127 ± 0.02 y(center) 0.3291 ± 0.02 Y(nits) 150 ± 10

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

Luminance is > 140 Nits in the center of the screen at sRGB color temperature.

3.5 Adjustment of sRGB (B)

Apply sRGB test program, the monitor shall pass sRGB test compliance.

(Note :For sRGB compliance , the monitor shall pass either max. Delta

Elessthan or equal to 15 and a

3.6 DDC/CI Function Check(B)

Connect D-sub andDVI-D cable to the monitor.ApplyDDC/CItest

program, the monitor shall pass DDC/CItestcompliance bothfor

VGA andDVIinput.

3.7 USB Function Check(B)

Connecting cable from upstreamport of the monitor to PC systemwith

XP OS and attaching external USB devices to downstreamports of the

monitor.ApplyUSBtest program, the monitor shall pass USB test

compliance.

3.8 Settingfor leaving the Factory(B)

a).The OSD Controls shall havethe followingfactorydefault values

after finishing all the

en adjustment is finished, monitor shouldbesetto

b.) Wh 6500K color.

c.) The monitor shall leavethe factorywith the power switch set to the OFF position

hescreencenter, the1931 CIE

sRGB

verage Delta E less than or equal to 10 )

Adjustment.

1.Menu =Basic

2. Color =6500K

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.OSDTimeout =30

10.SleepTimer =OFF

11.Brightness = 90%

12. Contrast =80%

HP L1740

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HP L1740

Failure Mode Of Panel

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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.

Polarizer has bubbles

Failure description

Vertical block defect

Vertical dim lines

Vertical lines defect (Always bright or dark)

Horizontal block defect

Phenomenon

Polarizer has bubbles

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

Concentric circle formed

Horizontal dim lines

Horizontal lines defect (Always bright or dark)

Has bright or dark pixel

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

Display adjustment

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Alignment procedure

1. Turn on HP L1740 LCDmonitor.

2.Turn onthe Timing/pattern generator. See Fig.1 Resolution :1280x1024 Timing : H= 31.47KHz V=60Hz

3. Preset LCD color Analyzer CA-110

-Removethe lens protective coverofprobe CA-A30.

-Set measuring/viewing selector to measuring analyzer.(zero calibration) as Fig.2

-Turn onthe color analyzer (CA-110)

-Press 0-CAL buttonto startingreset analyzer. S ee Fig.3

Fig. 1

Access Factory Mode

Poweroffonthemonitor, To h old AutoAnd

+"+" buttons at the same time ,

And press POWER buttonto poweronthemonitor. Press MANU buttonto bring up OSD menu for confirmation

" 1 "

" 4 "

position for reset

Measurement viewing selector

Cover(black)

Fig. 2

Clear image

Measurement/viewing selector

Fig. 4

10. Setting patterntofull white picture.

11. Press menu then select F, by button.

12. Press menu tobring up submenu as followingwindows.

9300° K

13. Press MENU buttons to select R GB.Increase/decrease value bypress or buttons until theX,Yco-ordinates as below:

6500 °K

14.

Original Panel Color

SRGB

15.

X=0.3127+/-0.02 Y=0.3291+/-0.02 Y=150+/-10

Alignment hits:1.Rforxvalue, G for y value, B for Y value onthe

16.

Gray scale checking

-Switch Timing/pattern generator to Pattern:64gray scale Timing: 1024 X 768 60Hz 63.98KHz

-Settingboth Brightness 90% and Contrast to80% (Value).

-Check black and white scale are visible clearly across thescreen.

" 2 "

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

colour analyzer.

2. If the colour analyzerhas been calibrated and preset colour temperatureinit.Please switch tocorrect

setting in accordance withcolour settings.

" 3 "

Factory Mode Indicator

Note: after alignment, please reset OSDto user smode for normal

operation. Otherwise, themonitor won t entering power saving mode and showingfull white pictureallthe time as novideo signal supplied. To leave factorymode by restartthemonitor.

.Adjust OSD menu to lower position of screen (i.g. adjust V-positionto

value " 0 "atsubmenu of OSD Setting.

6. Setting Brightness and Contrast

-Adjust Brightness tovalue " 90".

-Adjust Contrast tovalue " 80" .

7. Switch lightprobetoViewing position.

8. Movethe Lens

showninFig. 4

9.Switch lightprobetoMeasuring position.Itshould beable to indicate

barrel forward or backwardtoget clear imageas

See Fig. 5

Fig. 5

Note:The brightscale w

will beinvisible, if Yistoo small.Re-alignment or review

ill be saturated, if Yis too large.Thedark scale

HP L1740

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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.

Test method

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:

3. Equipments and Connection

3.1. Equipments For example :

- ChenHwa 9032PROGRAMMABLE 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

* Turn on the power switch of monitor before Hipot and

Ground Continuity testing.

Clip

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)

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)

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%.

(ChenHwa 9032 tester)

Video cable

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

Grounding screw

Connect the power cord to the monitor.

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.

Power outlet

4. Recording

(Rear view of monitor)

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

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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.

DDC EDID structure For Analog interface: Standard Version 3.0

Structure Version 1.2

For Digital inferface: Standard Version 3.0

Structure Version 1.3

System and equipment requirements

1.Ani486 (or above) personal computer or compatible.

2. Microsoft operation system Windows 95/98.

3. EDID301.EXE program (3138 106 10103) as shown in Fig. 1

EDID 46 release.exe (in the cd-rom manual

4. A/D Alignment kits (3138 106 10079):

inclusion : a. Alignment box x1 (as Fig. 2)

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

Using batteries (9V) 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.

Fig.5

A/D Alignment Kits - Digital connection

b. Printer cable x1 c. (D-Sub) to (D-Sub) cable x1 d. (DVI-D) to (D-Sub) cable x1 (as Fig. 3) Note: The EDID301.EXE (Release Version 1.58 20000818)is a windows-based program, which cannot be run in MS-DOS.

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Service

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Service

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CD-ROM with EDID46.EXE

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Service Manual

Fig.1

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BCU Monitors

Oct28, 2004

3138106 10437 HPL1740LCD

Fig.3

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

Fig.2

Pin assignment

A. 15-pin D-Sub Connector

B. Input DVI -D Connector pin

Fig.4

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Configuration and procedure

There are 2 chips contained OSD string, serial number..etc on the circuit board, main EEPROM which storage all factory settings,OSD string. DDC IC which storage 128byte EDID data(serial number ..etc.). Following descirptions are the connection and procedure for Analog and Digital DDC application, the main EEPROM can be re-programmed along with Analog/Digital IC by enable factory memory data write function on the DDC program (EDID301.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 (EDID301.EXE). Following steps show you the procedures and

writing block 4

connection. Step 1: Supply 8~12V DC power source to the Alignment box by plugging a DC power cord or using batteries. Step 2: Connecting printer cable and video cable of monitor as Fig. 6

8-12v

4.6

edid46Release For

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.8

Method 2: After create a shortcut of EDID301.EXE

This is for initialize alignment box.

: Double click EDID301 icon

is on the screen of Windows Wallpaper.

Bring up main menu of EDID301 as shown in Fig. 10.

This is for initialize alignment box.

4.6

(as shown in Fig. 9) which

Fig.10

Fig.6

Fig.9

Note 2: During the loading, EDID301 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 conn

ection.

Fig.7

You can copy the EDID46 to the hard disk and then execute the program with the same steps as above

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Re-programming Analog DDC IC

Step 1: After initialize alignment box, connecting all cables and

box as shown in Fig. 14

8-12V

Fig/14

Step 2: Read DDC data from monitor

1. Click icon as shown in Fig. 15 from the tool bar to bring up

the Channels "Configuration Setup" windows as shown in Fig. 16.

Fig.15

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

1. Click (new function) icon from the tool bar, bring up Step 1 of 9 as shown in Fig. 18 .

4.6

EDID301 DDC application provides the function selection and text change (select & fill out) from Step 1 to Step 9.

Fig.18

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

1. Click Next , bring up Fig. 19.

2. Select the DDC2B as the communication channel.

and "Enable Factory mode"

As shown in Fig. 16.

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. 17.

Fig.16

Fig.17

Fig.19

2. Click Next , bring up Fig. 20.

Fig.20

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3. Click Next , bring up Fig. 21.

4. Click Next , bring up Fig. 22

6. Click Next , bring up Fig. 24

Fig.24

Fig.21

7. Click Next , bring up Fig. 25

Fig.25

5. Click Next , bring up Fig. 23

Fig.22

8. Click Next , bring up Fig. 26.

- Serial number can be filled up or be changed at this moment.

- Click Finish to exit the Step window.

Fig.23

Fig.26

Step 5: Write DDC data

1. Configuration should be as Fig. 27.

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Access Factory Mode

Power off on the monitor, To hold Auto And + " + " buttons at the same time , And press POWER button to power on the monitor. Press MANU button to bring up OSD menu for confirmation

" 1 "

" 4 "

Fig.27

1730

Fig.29

2. Click . Save

Step 8: Exit DDC program

Pull down the File menu and select Exit as shown in Fig. 30.

Fig.30

NOTE: If the run in

Edid46Release

Win 95/98with some problem, try to run it in win 2000,

but you should install the first.

EDID_PORT_TOOL

The other step is the same as described .above

3. Click (Write EDID) icon from the tool bar to write DDC data. Bring up "Writing 0%~100%, ready" a progressing bar on the left down corner.

4. Click (Read EDID) to confirm it.

5. You can confirm the S/N in the OSD also press the menu and enter the management then you can see the S/N.

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. 29. The file type is EDID301 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 are completely correct, it can be saved as .ddc flie to re-load it into DDC IC for DDC Data application.

4.6

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Re-programming Digital DDC IC

Step 1:Connecting all cables and alignment box as shown in

Fig. 31.

8-12

Fig.31

Step 2: Initialize alignment box

(Shortcut of EDID301.EXE on Windows Wallpaper already.)

Double click EDID301 icon (as shown in Fig. 32) which is

on the screen of Windows Wallpaper.

Bring up main menu of EDID301 as shown in Fig. 33.

4.6

4. Click icon (Read EDID function) to read DDC EDID data from monitor. The EDID codes will display on screen as shown in Fig. 35.

Fig.35

Step 4: Modify DDC data (verify EDID version, week, year)

1. Click (new function) icon from the tool bar, bring up Step 1 of 9 (Digital) as shown in Fig. 36 . EDID4.6 DDC application provides the function selection and text change (select & fill out) from Step 1 to Step 9.

Fig.32

4.6

Step 3: Read DDC data frommonitor

1. Click icon from the tool bar to bring up the Channels

Configuration Setup windows as shown in Fig. 34.

2. Select the DDC2B as the communication channel.

and "Enable Factory mode"

3. Click OK button to confirm your selection.

Fig.34

Fig.33

Fig.37

Fig.36

Fig.38

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