AOC L1502 Service Manual

15" TFT LCD Colour Monitor

Service

Service

Service

XH3 HP 15”

HP L1502
AJ6S40/02
w/o audio

TABLE OF CONTENTS

Description

Important Safety Notice .................................. 2

Technical Data & Power Management.............. 3

Connecting to PC & the Monitor Front panel......4

OSD manu ..................................................... 5

Warning Message......... ..................................6

OSD Aging Mode & Lock/unlock.......................7

Factory Mode .......................................... ...... 8

Failure mode of LCD panel...............................9

Troubleshooting

Wiring Diagram..............................................11

Flat Panel Adjust ...........................................12

Definition of Pixel Defects.............................. 13

Mechanical Instructions .................................14~15

Safety Test Requirements ..............................16

Electrical Instructions............................. .......17

Display Adjustment........................................18~19

DDC Instructions and DDC Data .................... 20~25

ISP Instruction...............................................26

............................................10

Page

Compaq fp5315
AJ2S4M/02
w/ audio

HP L1523
AJ6S4M/02
w/ audio

Horizontal frequencies

47 - 63 kHz

Description

Repair Flow Chart...........................................27~29

Repair tips .....................................................30

Function Block Diagram..................................31

D-SUB / DVI Diagram .....................................33

ROM Diagram ................................................34

Scaler Diagram ..............................................35~36

Power Diagram ..............................................37

Audio Diagram............................................... 38

Control board Diagram and (C.B.A) ................ 39

Power board Diagram .................................... 40~41

Power board C.B.A.-1&-2................................42~43

Scaler board C.B.A-1&-2.................................44

Exploded View................................................45

Recommended Parts List & ....46~47

General product Specification ........................ 48~63

Different Parts List..........................................64~65

Spare Parts List

Page

~32

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.

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

REFER TO BACK COVER FOR IMPORTANT SAFETY GUIDELINES

Published by BCU Monitor Printed in Taiwan Copyright reserved Subject to modification Sep. 10 2003

S

GB

3138 106 10308

2

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9

HP L1502

IMPORTANT SAFETY NOTICE

Proper service and repair is important 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 thatimproper 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 ofall 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 aservice 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. in the parts list and
enclosed within a broken line*

(where several critical components are grouped in one area)
along with the safety symbol on the schematicsor
exploded views.

Use of substitute replacement parts which do not have the
same specified safety characteristics may create shock, fire,
or other hazards.

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 OFTHIS

SERVICE MANUAL.

Take care during handling the LCD module with backlight
unit

- Must mount the module using mounting holes arranged infour
corners.

- Do not press on the panel, edge of theframe strongly or electric
shock as this will result in damage to the screen.

- Do not scratch orpress on the panel with any 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 the module in high temperature and in areas of high
humidity for a long time.

- Avoid contact withwater 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.)

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

Technical Data

HP L1502

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3

Technical Specifications
LCD

Vendor LGPL CPT QDI

Updated date 2002-Aug-30 2002-Dec.-13 200 3-June-02

Physical Dimension (mm)

Model Number LS150X05 CLAA150XG08 QD15Xr01

Diagonal Size --- i nch 15. 0" 15.0" 15.0"

Active Area (W x H ) 304.1x228.1 304.1x228.1 304.1x228.1

Display Pixels (W x H ) 1024(x3) x 768 102 4(x3) x 768 1024( x3) x 768

Pixel Pitch (0.099x3) x 0.297 (0.099x3) x 0.297 (0.099x3) x 0.297

Display Outline (W x H x T )

Weight 995 g 1100g 1200g

Optical Characteristics

Number of Colors 6 bits (262K) 6 bits (262K) 6 bits(262K)

Contrast Ratio 400(typ),250(min) 400(typ), 300(min) 400(typ)

Viewing Angle (L/R) --- C/R>10 60/60(typ) 60/60(typ) 75/75(typ)

Viewing Angle (U/D) --- C/R>10 45/45(typ) 45/55(typ) 60/65(typ)

Luminance --- nits 250(typ),200(min) 250(typ), 200(min) 250(typ),200(min)

White ( x , y ) 313 , 329 312, 318 313,329

Red ( x , y ) 626 , 347 643,344 637,340

Green ( x , y ) 308 , 588 304,566 302,582

Blue ( x , y ) 146 , 119 141, 85 146,97

Color Gamut -- % 59.5% 63% 62%

Luminance Uniformity (min) 75% 75% 75%

Backlight Life (min) 40Khrs 35Khrs 30Khrs

Crosstalk (max) 1.20% 1.5% 1.5%

Electrical Characteri stics

Supply Voltage 3.3V 3.3V ; 12V 3.3V

Operating Ambient Temp 0 ~ 50C 0 ~ 55C 0 ~ 50C

Power Consumption ( max) 10.4W 10.8W 11W

Main Clock (Typ~Max) 50~79MHz 50~79MHz 50~80MHz

Response time (Tr+Tf) 25ms(typ) 25ms(typ) 25ms(typ)

326.0x254.0x11.5

326.0x251.0x12 321x 249x11

Unit dimension / Weight
Set Dimension (incl. Pedestal): W340mm xD185.3mmxH338mm.
New weight: 3.6 Kg

Temperature Ranges

Operating Temperature (Independent ofaltitude):5to35DegreeC.
Non-Operating Temperature (Independent of altitude): -20 to 60
DegreeC.
Humidity

Operating (non-condensing) : 20%to80%
Non-Operating (38.7Degree C maximum wet bulb temperature) :
5% to 90%
Altitude
Operating :0 to 12,000feet[3,658 m].Equivalent to 14.7 to 10.1 psia.
Non-Operating :0to 40,000 feet[12,192 m .Equivalent to 14.7 to 4.4
psia

FACTORY PRESET DISPLAY MODES

Preset

Format

1 640 x

2 640 x

3 640 x

4 720 x

5 800 x

6 800 x

7 800 x

8 832 x

9 1024 x

10 1024 x

11 1024 x

Pixel

480

480

480

400

600

600

600

624

768

768

768

Horz
Freq

(KHz)

31.469 - 59.940 - 25.175 VGA

37.861 - 72.809 - 31.500 VESA

37.500 - 75.000 - 31.500 VESA

31.469 - 70.087 + 28.322 VGA

37.879 + 60.317 + 40.000 VESA

48.077 + 72.188 + 50.000 VESA

46.875 + 75.000 + 49.500 VESA

49.726 +/- 74.551 +/- 57.284 MAC

48.363 - 60.004 - 65.000 VESA

56.476 - 70.069 - 75.000 VESA

60.023 + 75.029 + 78.750 VESA

Horz

Polarit

y

Vert
Freq
(Hz)

Vert

Polarity

Pixel

Clk

(MHz) Source

Power management

Pin Assignment:

PIN 1

PIN 11

PIN 9

PIN MNEMONIC SIGNAL

1 RV Red Video
2 GV Green Video/Sync on Green
3 BV Blue Video
4 NC None
5 GND Ground (DDC Return) or Cable detect
6RGRedGND
7 GG Green GND
8BGBlueGND

9+5V+5V
10 SG Sync GND or Cable detect
11 NC None
12 SDA DDC Data
13 HS Horizontal Sync
14 VS Vertical Sync
15 SCL DDC Clock

PIN 5

CPU

State

Monitor

State

Maximum

Power

(Watts)

Power

Switch LED

Color

Full Power Full Power 25 Green

Sleep Sleep 2 Amber

- Switch Off 2 (LED off)

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.

4

HP L1502

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Connecting The Monitor

Connecting to Your PC

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

2. Connect the monitor signal cable on the back of the monitor to the
video connector on the rear panel of 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.

4. If your monitor is a multimedia model, connect one end of the audio
cable to the back of the monitor, and the other end to the audio
Connector on the back of the computer.

Front Panel Components

1 Speakers Audio feature for music,alarms,etc.(multimedia models only)

2 (Headphone jack)Connects a headphone set to the monitor.

3 Menu button Launches the On-Screen Display (OSD) menu and

selects functions.

4 (Minus button) When OSD is inactive, auto-adjusts the screen

Image. When OSD is active, navigates in reverse through the OSD
and adjusts OSD scale settings.

5 + (Plus button) When the OSD is active, navigates through the OSD

and adjusts OSD scale settings.

Installing the Monitor Pedestal

To install the monitor pedestal:

1. Place the pedestal plate on your desktop or table and check to
be sure the arrow on the underside of the plate is facing forward.

Do not install the base if the monitor will be used on a wall, swing arm,
or other mounting fixture; instead see the section on “Mounting the
Monitor” in this chapter.

2. Using both hands, position the monitor over the pedestal base

and press down firmly to lock the pedestal base in place. When the
base locks, it will make a clicking sound. Make sure the pedestal base
is securely locked before continuingwith the setup.

6(Volume control)Controls the volume level of the monitor speakers.

7 Power LED Fully powered = Green.

Sleep mode = Amber.
Sleep Timer mode = Flashing Amber.

8 Power Switch Powers the monitor on and off.

No. Control Function
No. Control Function

1 Menu button Launches the On-Screen Display (OSD) menu and

selects functions.

If you need to remove the pedestal base, lay the monitor down on
a soft protected surface. On the bottom side of the pedestal base,
press together the two tabs as shown in the following illustration.
This will release the pedestal from the base.

2 (Minus button) When OSD is inactive, auto-adjusts the screen

image. When OSD is active, navigates in reverse through the OSD
And adjusts OSD scale settings.

3 + (Plus button) When the OSD is active, navigates through the OSD

and adjusts OSD scale settings.

4 Power LED Fully powered = Green.

Sleep mode = Amber.
Sleep Timer mode = Flashing Amber.

5 Power Switch Powers the monitor on and off.Number Control Function

Brightness

Contrast

Image control

Color

Language

Management

OSD control

Factory reset

Exit

Main manu

On-Screen Display

Pressing the Menu button ( ) the first time brings up the BASIC
menu level. The + and buttons move up and down the menu,
respectively. The selected menu function shall be highlighted in
orange text for all menus. Pressing the Menu button again brings up
the second menu level for the item selected. The selection will wrap
around if the bottom item is selected and the button is pressed, the
selection will move to the top item. Likewise, if the top item is
selected and the + button is pressed, the selection will move to the
bottom item. Selecting the “Advanced Menu” from the Basic Menu
will result in the display of the ADVANCED OSD. The Advanced
Menu will remain the default OSD upon subsequent power-ups of the
monitor until the “Basic Menu” option is selected or until “factory
reset” is selected.

HP L1502

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5

ADVANCED OSD MODE CONFIGURATION

Mode Menu

Menu Level 1 Menu Level 2 Menu Level 3 Factory Reset

Brightness ADJ Scale Y (FD = 100)

Contrast ADJ Scale Y ( FD = 50)
Image Control Auto Adjustment Show “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-sRGB Y (FD = 6500 K-

Custom Color R/G/B Color ADJ Y(FD =100)
Cancel
Save and Return

Language Deutsch

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)
Sleep Timer Timer Set Menu N (FD=0;OFF)
Cancel
Save and Return

OSD Control Horizontal OSD

Position
Vertical OSD
Position
OSD Timeout ADJ Scale N (FD=30)
Cancel
Save and Return

Factory Reset Yes

No

Exit

ADJ Scale N (FD=50)

ADJ Scale N (FD=50)

sRGB )

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HP L1502

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Menu Level 1 Menu Level 2 Menu Level 3 Factory Reset

Brightness ADJ Scale Y (FD = 100)

Contrast ADJ Scale Y ( FD = 50)
Auto Adjustment Show “Adjusting… ” message Y(noFD)
Advanced Menu Refer to table 8
Exit

Warning message table

Item Attention Signals Display Time Condition

1 Input Signal out of Range see power saver table

2 No Input Signal see power saver table

3 Going to Sleep see power saver table

4 Adjusting… .. The Minus ( " - " ) button shall be a hot-key for the Auto-Adjustment process.

5 OSD Lockout 10secs Push menu key for 10 sec then display 10 sec WM “OSD Lockout”

6 Check Video Cable see power saver table

Warning message table

BASIC OSD MODE CONFIGURATION

Mode Menu

Menu button ( ), shall be hot-key for OSD Menu Exit

Power Saver table

Power Saver - On Power Saver - Off Note

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

"Going to Sleep" 3 sec then sleep. moving WM "No Input Signal" always.

Disconnect cable 1. System blank and show 1. System blank and show

WM “Check Video Cable”10 WM “Check Video Cable” 10

sec then moving about 50 sec. sec then moving always.

2. Show WM “Going to

Sleep” 3 sec then sleep.

3. If push any key in sleep

mode, then repeat item 1 to 2.

Out of range –1 1. System blank and show 1. System blank and show H<29.5 or

moving WM “Input Signal moving WM “Input Signal H>82.5 or

out of Range” 60 secs. Out of Range” always. V<49 or

2. Show WM “Going to V>87 or

Sleep” 3 sec then sleep. Vtotal>=1200

3. If push any key in sleep

mode, then repeat item 1to 2.

Out of range –2 1. Show moving WM 1. Show moving WM DownScaling

"Input Signal out of Range" 60 sec. “Input Signal out of Range”60 sec. Ex.

2. Menu key can active 2. Menu key can active 1280x1024

during moving WM and during moving WM and

operate OSD menu. operate OSD menu.

3. WM disappear if menu 3. WM disappear if menu

key push or after WM 60 sec. key push or after WM 60 sec.

Out of range –3 1. Show moving WM 1. Show moving WM 85Hz

"Input Signal out of Range" 60 sec. “Input Signal out of Range”60 sec.

2.AftermovingWM60sec 2.AftermovingWM60sec

then show WM “Going to Sleep”3 sec then show WM “ Going to

then sleep. Sleep” 3 sec then sleep.

3. If push any key in sleep 3. If push any key in sleep

mode, then repeat item 1 to 2. mode, then repeat item 1 to 2.

OSD Lock/Unlock, Aging & ,
Enable/Disable "warning message"

HP L1502

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7

Front control panel

Fig. 1

1 Speakers Audio feature for music,alarms,etc.(multimedia models only)

2 (Headphone jack)Connects a headphone set to the monitor.

3 Menu button Launches the On-Screen Display (OSD) menu and

selects functions.

4 (Minus button) When OSD is inactive, auto-adjusts the screen

Image. When OSD is active, navigates in reverse through the OSD
and adjusts OSD scale settings.

5 + (Plus button) When the OSD is active, navigates through the OSD

and adjusts OSD scale settings.

6(Volume control)Controls the volume level of the monitor speakers.

7 Power LED Fully powered = Green.

Sleep mode = Amber.
Sleep Timer mode = Flashing Amber.

Access Aging.. Mode

Step 1: Turn off LCD monitor, and disconnect Interface Cable

Step 2 :

[Press power " " button untill comes out "AGING screen"

Bring up

After 15 seconds, bring up :

After 15 seconds, bring up :

between Monitor and PC.

[Push " " & " " buttons at the same time and hold it ] +

] => then release all buttons.

+

:

AGING...AGI N G ...

AGING...AGI N G ...

8 Power Switch Powers the monitor on and off.

No. Control Function
No. Control Function

To Lock/Unlock OSD function (User Mode)

The OSD function can be locked by pressing " " button(3) for
more than 10 seconds, the screen shows following windows for 3

seconds. Everytime when you press " " or"+"button, this
message appears on the fly screen automatically.

-

ATTENTION

OSD LOCK OUT

Unlock OSD function:

Locked OSD function can be released by pressing" " button for
more than 10 seconds again.

Fig. 2

To Enable/Disable "Warning message" on screen
(in User Mode)

Step 1: Turn on LCD monitor, and disconnect Interface Cable

between Monitor and PC. bring up

After 15 seconds, bring up :

----------

---------­repeatly

Connect signal cable again => go back to normal display.

Status 1.:

Check Video Cable

Connect signal cable again

=> go back to Windows screen.

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HP L1502

Factory mode

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Front control panel

Fig. 1

Basic and simple instruction on the control keys.

When you press the button on the front control of your monitor, the On­Screen Display (OSD) Main Controls window will pop up and you can
then start making adjustments to your monitor's various features.

Access Factory Mode

Fig. 3

How to Get into Factory Mode Menu

Step 1 :

Turn off monitor.

Step 2 :

[Push " " & " " buttons at the same time and hold it ] +

[Press power " " button untill comes out "Windows screen"

] => then release all buttons.

Step 3 :

Press OK " " button, bring up Factory mode indication as
shown in Fig 2.

Fig. 2

+

Main manu

Brightness

Contrast

Image control

Color

Language

Management

OSD control

Factory reset

Exit F

<------Factory mode indicator

BL : Blacklevel value
SUB-BRI : Brightness value range(Min Max). Fix value for

SUB-CON : Contrast value range(Min Mid Max)
SRGB-B : Brightness of sRGB(Reserved)
SRGB-C : Contrast of sRGB(Reserved)
Gain-m : Minimum value of User Gain
Gain-M : Maximum value of User Gain
AUTO-SUB: To do Auto color function when push "Up" key in

OSDTIMER : OSD time out control (sec) Unused in this project
VCOM : For LG panel control
IDX : Limit current of inverter(Fix value QDI: 76, CPT: 45, LG:5)
Panel Type: If set this to 17, 34 or 68 then system will force panel

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

SUB CON:SUB CON:

9300KRGB
6500KRGB

continue mode requirement.LG(Min=165, Max=255),
CPT(Min=165, Max=230), QDI(Min=165, Max=225).

White pattern

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

-

Contrast adjustment (Sub-Contrast). Use this menu item to

adjust the contrast gain of pre-amp ranges from 0 to 255.

Color temperature gain adjustment. Use these menu items to
adjust the RGB gains of pre-amp for different color
temperatures, ranges from 0 to 255.

Factory menu

Cursor can move on gray color area

Hot key function: by pressing "UP" and "DOWN" key

simultaneously at User mode (or Factory mode).

(PS: The OffsetRGB function can be used on reduce or eliminate
snowy noise on the background when the resolution of video signal is
1280 X 1024 vertical 60Hz. Slightly increase or decrease the value
until snowy noise completely disappear.)

OFFSET R G B

GAIN R G B

AUTO SUB:

AUTO SUB:

Sub-Brightness adjustment. Use this menu item to adjust
the brightness level (DC-level) of pre-amp range from 0 to

255.(R/G/B ANALOG DC -level).

R/G/B GAIN adjustment. Use this menu item to adjust
the R/G/B (GAIN) of Amp. range from 0 to 255.(R/G/B
ANALOG GAIN Values).

-

Do not use this function here.

It is for 1024x768/60Hz with special pattern only.

OK

Failure Mode of LCD panel

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
or backlight tubes.

Failure description Phenomenon

Polarizer has bubbles

HP L1502

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9

9

..

Vertical block defect

Vertical dim lines

Vertical lines defect
(Always bright or dark)

Horizontal block defect

Polarizer has bubbles

. .. .

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

Concentric circle formed

Horizontal dim lines

Horizontal lines defect
(Always bright or dark)

Has bright or dark pixel

Bright pixel

.

.

..

..

Dark pixel

.

.

.

.

.

.

Bottom back light of LCD is
brighter than normal

Backlight un-uniformity

Backlight has foreign

material. Black or white
color, linear or circular type

. .. .

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HP L1502

Troubleshooting

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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
blurred, indistinct, or
Too dark.

Image is not
Centered. auto-adjust the screen image.

Check Video
Cable is displayed
on screen.

(Input Signal Out of
Range) is displayed
on screen.

Brightness and contrast Press the Minus button on
are too low. the monitor front panel to

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.

Position may need When OSD is inactive,press-(minus

Adjustment. button) to

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.

Monitor video cable is Connect the 15-pin monitor video cable

disconnected. to the VGA connector on the computer.

Be sure that the computer
power is off while: connecting the video

Cable.

Video resolution and/or Restart your computer and enter Windows
refresh rate are set Safe Mode by pressing the F6 Function

higher than what your key when the computer starts to boot up.

monitor supports. Change your settings to a supported

setting.
new settings take effect.

Restart your computer so that the

Wiring Diagram

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11

12

HP L1502

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Flat Panel Adjust

Optimizing Performance

For best performance, ensure that your display settings are set at 1024x768@60Hz (for
14"/15") or 1280x1024, 60Hz (for 17"/18").

Note: You can check the current display settings by pressing the 'OK' button once. Go into the
Product Information.
The current display mode is shown on the item called RESOLUTION.

You can also install the Flat Panel Adjust (FP Adjust) program, a program for getting the best
performance out of your monitor. This included on this CD. Step-by-step instructions are
provided to guide you through the installtion process. Click on the link to know more about this
program.

Installing FPadjust Program

The FP Adjust program generates alignment patterns which will help you adjust monitor
settings such as CONTRAST, BRIGHTNESS, HORIZONTAL & VERTICAL POSITION, PHASE
and CLOCK.

System requirements:
PC running Windows 95, Windows 98, Windows 2000, Winodws Me, Windows XP or later

To install FPadjust Program:

Click on the link or icon to install FPadjustment Program.
or
Click-and-hold your mouse over the icon. (Win95/98/2000/Me/XP users right-click)
Download FP_setup04.exe
From the menu that appears, choose 'Save Link As...', 'Save Target As...' or 'Download Link to
Disk'.
Choose where you would like to save the file; click 'Save' (if prompted to save as either 'text'
or 'source', choose 'source'). Exit your browser and install the FPadjust Program. Read the
"FP_Readme04.txt" file before installing.

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

3. visible than a defective whole pixel
and is small and only visible on a specific background.
The HP display does not have more than:

4. 3 bright dots.

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13

5. 5 dark dots.

6. 5 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.

14

HP L1502

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Mechanical Instructions

Front view-HP L1523

Back view

Fig. 1

Fig. 2

Step 2.Remove the

Use the thin "I" type screw driver to open the clicks as Fig.5~7.

back cover

=====>

Botton view

Right and Left view

=====>

=====>

=====>

=====>

=====>

=====>

=====>

Fig.5

=====>

Fig.6

=====>

Step 1. Remove the Base as Fig .3

Remove the four screws of Fig. 4.Back cover as

Base =====>

Four screws

=====>

============>

=============>

=====>

Fig. 3

Top view

Step 3. Remove the 13 screws

And Disconnect the 4 cables as Fig.8

4 Cables

=====>

===========>

Step 4. Disconnect the 2 cables as Fig.9

===>

===>

Fig.7

Fig.8

Fig. 4

2 cables===>

========>

Fig.9

Mechanical Instructions

Remove the Scaler and Power board as Fig. 10.

HP L1502

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======>

15

Power board

Step 5. Remove the control board

Remove the seven screws and cable as Fig. 11 & 12.

Scaler board

Cable

Fig. 10

Fig. 11

Fig. 14

Fig. 15

1050 9322 196 43682 TFT-LCD LS150X05 (LGPH)
1050 9322 195 10682 TFT-LCD CLAA150XG08 (CPT0)

Step 6. Remove the Front Bezel

Use the thin "I" type screw driver to open the clicks
as Fig.13 &14.

======>

======>

***************************************************************************
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).
***************************************************************************

Fig. 12

======>

======>

Fig. 13

16

HP L1502

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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. 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.

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

* Turn on the power switch of monitor before Hipot and

Ground Continuity testing.

Clip

Clip

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:

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+R ohm,
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

(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.

2.2.1 The test with AC voltage is only for production purpose,

Service center shall use DC voltage.

2.2.2 The minimum test duration for Quality Control Inspector
must be 1 minute. No breakdown during the test.

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

2.2.4 The grounding blade or pin of mains plug must be
conducted with accessible metal parts.

Power outlet

(Rear view of monitor)

4. Recording

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

Electrical Instructions

General points

1.

1.1 During the test and measuring, supply a distortion free AC mains
voltage To the apparatus via an isolated transformer with low
internal resistance.

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

1.3 All voltages are to be measured or applied with respect to ground,
unless otherwise stated.

Note: don't use heat-sink as ground.

1.4 The test has to be done on a complete set including LCD panel
after 30 minutes warm-up at least in a room with temperature of 25
+/- 5 degree C.

1.5 All values mentioned in this test instruction are only applicable of a
well aligned apparatus, with correct signal.

1.6 The letters symbols (B) and (S) placed behind the test instruction
denotes (B): carried out 100% inspection at assembly line

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

1.8 Repetitive power on/off cycle are allowed except it should be
avoided within 6 secretary.

Input signal2.

2.1 Signal type

1 640 x 480 31.469 - 59.940 - 25.175 VGA
2 640 x 480 37.861 - 72.809 - 31.500 VESA
3 640 x 480 37.500 - 75.000 - 31.500 VESA
4 720 x 400 31.469 - 70.087 + 28.322 VGA
5 800 x 600 37.879 + 60.317 + 40.000 VESA
6 800 x 600 48.077 + 72.188 + 50.000 VESA
7 800 x 600 46.875 + 75.000 + 49.500 VESA
8 832 x 624 49.726 +/- 74.551 +/- 57.284 MAC
9 1024 x

10 1024 x

11 1024 x

(S): carried out test by sampling

Video: 0.7 Vpp linear, positive polarity

Sync. : TTL level, separate, positive or negative polarity

Reference generator: CHROMA 2200 or 2250

Allowed signal modes list: Table A

Pixel

Format

768

768

768

FACTORY PRESET DISPLAY MODES

Horz
Freq

(KHz)

48.363 - 60.004 - 65.000 VESA

56.476 - 70.069 - 75.000 VESA

60.023 + 75.029 + 78.750 VESA

Horz

Polarity

TABLE A

Vert

Freq

(Hz)

Vert

Polarity

Pixel

Clk

(MHz)

HP L1502

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3.3 Color temperature adjustment

Apply a 48.36kHz / 60Hz signal with white pattern.

Set brightness control at 100% and contrast control at 50%.

Adjust the R.G.B gain to reach special color temperature on

center of screen. Keep one color fixed gain to maximum at least.

The 1931 CIE chromaticity (x, y) coordinates shall be:

9300°K 6500°K-sRGB

x (center) 0.283 ± 0.005 0.313 ± 0.005

y (center) 0.297 ± 0.005 0.329 ± 0.005

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

3.4 NVRAM(24C16) Default Values

Sub_Bri: 165 255/LG 230/CPT 225/QDI

Sub_Con: 100 127 154

VCOM: 152

3.5 Factory Reset

After finishing all the adjustment, select “Factory Reset” function

to recall:

Do an automatic Auto-Adjustment

Set Brightness = 100

Set Contrast = 50

Set Color = 6500K-sRGB

Set Custom Color (R.G.B) = 100

3.6 Main Menu Factory Default Values

The OSD shall have the following factory default values:

Language = English

OSD Cotrol:

Horizontal OSD position = 50

Vertical OSD position = 50

OSD timeout = 30s

Management:

Power Saver = ON

Power On Recall = ON

Mode display = OFF

Sleep Timer = OFF

Menu = BASIC

17

3. Display Adjustment (B)

Access to factory mode. Check “CPU version”, if it is not right
version, then ISP new one (7301). After pre-check, aging 1 hour at

Least. Programming Analog DDC Data into Monitor.

3.1 Panel flicker adjustment (B)

Apply a 48kHz/60Hz signal with green pixel on/off at 128/256-level

pattern for LG panel. Set brightness control at 100%, and contrast

control at 50%, adjust GPIO1 of 7443 GM2116AA which is on

scaler board to make panel's flicker minimum.

3.2 Auto color adjustment

Apply a 48.36kHz/60Hz signal with white pattern.

Set brightness at 100% and contrast at 80%.

Using auto color, let scaler calibrate offset1,offset2 and gain itself.

** Check the 64-gray level is distinguishable.

18

HP L1502

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Display Adjustment

Display Adjustment:

Press and button simultaneously while power ON.
Adjust OSD menu to lower position of screen (i.g. adjust OSD H­Position and OSD V-Position to 0 at OSD setup sub-menu. Then

Down Up Factory Entrance

press or button to move the cursor to
item ( see yellow circle on table 1). Press button to access
to factory mode (see table2.). Check the code of CPU version if it
is not right version, then ISP new one (7301). After pre-check,
aging 1 hour at least. Programming Analog DDC data into
Monitor. Check # serial number to meet bar code label.

+

Menu

Main manu

Brightness

Contrast

Image control

Color

Language

Management

OSD control

Factory reset

1. Auto color adjustment:

Apply a 48.36kHz/60Hz signal with white pattern. Set brightness
at 100% and contrast at 50%. Move the cursor by pressing or

button to ( see red circle on table 2 ), press OK

Down AutoColor

button to do auto color, scaler would calibrate offset1,offset2 and
gain itself then display OK. Check the 64-gray level is
distinguishable.

Up

2. Color temperature adjustment:

Apply a 48.36kHz / 60Hz signal with white pattern.Set brightness

control at 100% and contrast control at 50%. Adjust the R.G.B
gain to reach special color temperature on center of screen.

Keep one color fixed gain to maximum at least.

2 .1 Aim the probe CA-A30 at the center of screen as Fig. 1

2 .2 Remove the lens protective cover of probe CA-A30.

2 .3 Set Measuring/viewing selector to Measuring position for reset

analyzer. (Zero calibration) as Fig. 2

2 .4 Turn on the colour analyzer (CA-110).

2 .5 Press 0-CAL button to start reset analyzer. See Fig.3

Exit F

<-------------Factory mode indicator

Table 1.

Table 2. The content of Factory setting.see table 2.

Cursor can move on gray color area

<------Version of code indicator

Fig. 1

cover (black)cover (black)

Measurement/viewing selectorMeasurement/viewing selector

Fig. 2

Table 2.

0-CAL

Fig. 3

Display Adjustment

HP L1502

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19

2.6 Switch light probe to Viewing position.

2.7 Move the Lens barrel forward or backward to get clear image as

shown in Fig. 4

2.8 Switch light probe to Measuring position. It should be able to

indicate colour value on the CA-110.

Clear image

Measurement/viewing selectorMeasurement/viewing selector

Fig. 4

2.9 Press buttons to selectRGBof9300 and 6500.

Menu

Increase / decrease value by press or buttons until the
1931 CIE chromaticity ( x,y)asbelow.

Up Down

4. Factory Reset:

After finishing all the adjustment, select “Factory Reset” function
to recall:

Do an automatic Auto-Adjustment

Set Brightness = 100

Set Contrast = 50

Set Color = 6500K-sRGB

Set Custom Color (R.G.B) = 100

To leave factory mode by restart the monitor.

5. EEPROM Presetting:

After finishing all the adjustment,Set:

Brightness control to 100%
Contrast control to 50%
OSD position at middle of screen.
Color Adjust to 6500K color.
When adjustment is finished,monitor should be set to 6500K.

9300°K 6500°K
x (center) 0.283 ± 0.020 0.313 ± 0.020
y (center) 0.297 ± 0.020 0.329 ± 0.020

Alignment hits:

1. R for x value , G for y value, B for Y value on the colour analyzer.

2. Must to select 9300 in user mode, then 9300 is available in factory
Mode.

3. Must to select 6500 in user mode, then 6500 is available in factory
Mode.

3. NVRAM(24C16) Default Values:

6.Main Menu Factory Default Values

The OSD shall have the following factory default values:

Language = English

OSD Cotrol:

Horizontal OSD position = 50

Vertical OSD position = 50

OSD timeout = 30s

Management:

Power Saver = ON

Power On Recall = ON

Mode display = OFF

Sleep Timer = OFF

Sub_Bri: 165 255/LG 230/CPT 225/QDI

Sub_Con: 100 127 154

VCOM: 152

20

X

HP L1502

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DDC Instructions

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" ".
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.

Analog DDC IC, & EEPROM

System and equipment requirements

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

ou have t

Fig. 1 .

Fig. 1Fig. 1

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

using as power source. Pull out the socket by

batteries (5V)

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.

To Printer port

DC 5V

To Monitor
D-sub cable

Power
indicator

Fig. 3Fig. 3

1

15

5

6

11

Pin assignment

A. 15-pin D-Sub Connector

10

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 .

3. EDID45.EXE program .

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

Fig. 2Fig. 2

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

PIN MNEMONIC SIGNAL

1 RV Red Video
2 GV Green Video/Sync on Green
3 BV Blue Video
4 NC None
5 GND Ground (DDC Return) or Cable detect
6RGRedGND
7GGGreenGND
8BGBlueGND

9+5V+5V
10 SG Sync GND or Cable detect
11 NC None
12 SDA DDC Data
13 HS Horizontal Sync
14 VS Vertical Sync
15 SCL DDC Clock

Note: The EDID45.EXE is a windows-based program, which cannot
be run in MS-DOS.