17" LCD Colour Monitor |
SH4 HP L1740 |
Service
Service
Service
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 |
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Description |
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DDC Instructions/DATA------------------------- |
23~31 |
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ISP Instructions--------------------------------- |
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32~34 |
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Repair tips/Repair Flow chart------------------ |
35~38 |
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Wiring Diagram--------------------------------------- |
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39 |
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Function Block---------------------------------------- |
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40 |
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Scaler Diagram---------------------------------- |
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41~45 |
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Scaler Board C.B.A------------------------------ |
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46~47 |
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Control Diagram & C.B.A.---------------------------- |
48 |
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Power Diagram ---------- |
.----------------------- |
49~54 |
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---------------------------------------Exploded View |
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55 |
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Recommended/Spare |
parts list---------------- |
56~58 |
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General product specification------------------ |
59~90 |
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Different parts list------------------------------------ |
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91 |
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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 Monitors |
Printed in Suzhou |
Copyright reserved |
Subject to modification F Nov .11 2004 |
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GB 3138 106 10438 |
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2 |
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HP L1740 |
Important Safety Notice |
Go to cover page
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. * Broken Line
FOR PRODUCTS CONTAINING LASER :
DANGERInvisible laser radiation when open.
AVOID DIRECT EXPOSURE TO BEAM. CAUTIONUse of controls or adjustments or
performance of procedures other than those specified herein may result in hazardous radiation exposure.
CAUTIONThe 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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3 |
Go to cover page
"
4 HP L1740
Go to cover page
Technical Data(Continued)
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)
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Resolution |
H-Frequency |
Pixel rate |
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V-Frequency |
Comment |
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(Hz) |
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1 |
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640X480 |
31.469K |
25.175 |
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59.940 Hz |
VGA |
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2 |
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640X480 |
37.861K |
31.5 |
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72.809 Hz |
VESA |
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3 |
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640X480 |
37.5K |
31.501 |
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75 Hz |
VESA |
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4 |
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720X400 |
31.469K |
28.322 |
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70.087 Hz |
VGA |
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5 |
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800X600 |
37.879K |
40 |
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60.317 Hz |
VESA |
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6 |
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800X600 |
48.077K |
50 |
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72.188 Hz |
VESA |
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7 |
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800X600 |
46.875K |
49.498 |
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75 Hz |
VESA |
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8 |
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832X624 |
49.726K |
57.284 |
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74.551 Hz |
MAC |
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2.5 |
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9 |
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1024X768 |
48.363K |
65 |
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60.004 Hz |
VESA |
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10 |
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1024X768 |
56.476K |
75 |
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70.069 Hz |
VESA |
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11 |
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1024X768 |
60.023K |
78.75 |
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75.029 Hz |
VESA |
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12 |
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1152X870 |
68.68K |
100 |
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75.06 Hz |
MAC |
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13 |
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1152X900 |
71.71K |
108 |
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76.05 Hz |
SUN |
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14 |
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1280X1024 |
63.98K |
108 |
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60.02Hz |
VESA |
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15 |
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1280X1024 |
79.97K |
135 |
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75.02Hz |
VESA |
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Over-scan Mode |
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16 |
640*480 |
43.269K |
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36.000 |
85.008Hz |
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Technical Data(continued)
HP L1740 |
|
5 |
Go to cover page
2.13
2.14
2.12
6 HP L1740
Go to cover page
Technical Data(Continued)
Installation
HPL 1740 |
|
7 |
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Go to cover page
3. For analog operation, connect one end of the VGA signal
Rear Panel Components cable to the VGA connector on the monitor 1, and the other end to the VGA connector on the computer 2.
No |
Component |
Function |
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1 |
AC power connector |
Connects the AC power cord to the monitor |
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2 |
USB downstream |
connectors Connects optional USB devices |
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to the monitor |
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3 |
USB upstream connector |
Connects the USB cable to the host |
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(computer or another USB hub) |
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4 |
DVI connector (available on |
. Connects the DVI -D signal cable to the |
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select models) |
monitor |
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5 |
VGA connector |
Connects the VGA cable to the monitor |
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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 USB Cable
Connecting the Power Cable
8 HP L1740
Go to cover page
Front Pan el Controls
On Screen Display
No |
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Control |
Function |
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BASIC OSD MENU LEVEL S |
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1 |
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Auto Adjust |
Activates the auto adjustment feature for optimum |
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image |
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2 |
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Menu |
Opens the On-Screen Display (OSD) menu |
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3 |
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–- (Minus) |
If OSD is on, press to navigate backward through |
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the OSD menu features and decrease adjustment |
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levels. |
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If OSD is off, press to enable the DVI signal input |
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(available on select models) |
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4 |
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+ (Plus) |
If OSD is on, press to navigate forward through the |
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OSD menu features and increase adjustment |
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levels |
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If OSD is off, press to enable the VGA signal input |
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5 |
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Power |
Turns the monitor on or off |
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On Screen Display
HPL 1740 |
|
9 |
Go to cover page
ADVANCED OSD MENU LEVELS
Analog Mode Menu
Menu Level 1 |
Menu Level 2 |
Menu Level 3 |
Factory Reset? |
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Brightness |
ADJ Scale |
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Y (90) |
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Contrast |
ADJ Scale |
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Y (80) |
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Image Control |
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Auto Adjustment |
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("Adjusting " message) |
Y (no FD) |
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Horizontal Position |
ADJ Scale |
Y (no FD) |
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Vertical Position |
ADJ Scale |
Y (no FD) |
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Clock |
ADJ Scale |
Y (no FD) |
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Clock Phase |
ADJ Scale |
Y (no FD) |
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Cancel |
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Save and Return |
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Color |
9300 K |
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6500 K |
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SRGB |
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Save and Return |
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Deutsch |
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English |
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Save and Return |
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Management |
Power Saver |
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On / Off Selection |
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Power On Recall |
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Off |
Selection |
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Mode Display |
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Off |
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Power-On Status display |
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Sleep timer |
Timer Set Menu |
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Default Video Input |
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Serial Number |
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Basic Menu |
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Cancel |
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Save and Return |
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OSD Control |
Horizontal OSD Position |
ADJ Scale |
N (FD=50) |
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Vertical OSD Position |
ADJ Scale |
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OSD Timeout |
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ADJ Scale |
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Save and Return |
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Information |
Current Settings: |
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Recommended Settings: |
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Serial Number: |
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Total Hours: |
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Backlight Hours: |
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Exit |
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Factory Reset |
Yes |
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No |
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10 |
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HP L1740 |
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On Screen Display |
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Go to cover page |
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Digital Mode Menu |
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Menu Level 1 |
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Menu Level 2 |
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Menu Level 3 |
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Factory Reset? |
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Brightness |
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ADJ Scale |
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Y (90) |
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Contrast |
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ADJ Scale |
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Y (80) |
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Color |
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9300 K |
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6500 K |
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Y (FD) |
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Custom Color |
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Custom Color ADJ |
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SRGB |
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Cancel |
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Save and Return |
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Language |
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Deutsch |
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S. Chinese |
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English |
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N (FD=English) |
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Español |
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Français |
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Italiano |
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Nederlands |
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Cancel |
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Save and Return |
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Management |
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Power Saver |
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On / Off Selection |
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N (FD=ON) |
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Power On Recall |
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On / Off Selection |
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N (FD=ON) |
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Mode Display |
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On / |
Off |
Selection |
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N (FD=OFF) |
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On / |
Off |
Selection |
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N (FD=ON) |
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Power-On Status Display |
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Sleep Timer |
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Timer Set Menu |
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Default Video Input |
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-Analog - VGA |
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N (FD = DVI) |
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-Digital - DVI |
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Display monitor s/n |
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Serial Number |
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Basic Menu |
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N (FD=Basic) |
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Cancel |
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Save and Return |
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OSD Control |
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Horizontal OSD Position |
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ADJ Scale |
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N (FD=50) |
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Vertical OSD Position |
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ADJ Scale |
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N (FD=50) |
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OSD Timeout |
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ADJ Scale |
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N (FD=30) |
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Cancel |
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Save and Return |
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Information |
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Current Settings: |
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Yes |
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Recommended Settings: |
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Serial Number: |
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Total Hours: |
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Backlight Hours: |
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Exit |
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Factory Reset |
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Yes |
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No |
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Exit |
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NOTE:
" "
Unless designated by “FD”, the original factory default settings are identical to the user Factory Reset function.
Warning Message
HPL 1740 |
|
11 |
Go to cover page
Item |
Attention Signals |
Display Time |
Condition |
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1 |
Input Signal out of Range |
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See section power saver |
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2 |
No Input Signal |
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See section power saver |
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3 |
Going to Sleep |
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See section power saver |
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4 |
Adjusting |
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Auto hot key or OSD menu function |
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5 |
OSD Lock out |
3secs |
Push menu key for 10 sec then display 3 sec WM "OSD Lock out" |
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6 |
Input Not Available |
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DVI (Analog) switch to Analog (DVI) without sync |
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7 |
Check Video Cable |
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See section power saver |
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Power saver
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Power Saver - On |
Power Saver - Off |
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Note |
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Quit signal |
with |
1. System blank and show WM "Going |
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cable |
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1. System blank and show moving |
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to Sleep" 3 sec then sleep. |
WM "No Input Signal" always. |
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Disconnect cable |
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1. System blank and show WM Check |
1. System blank and show WM |
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Video Cable 10 sec then moving about |
"Check Video Cable" 10 sec then |
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50 sec. |
moving always. |
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2. Show WM "Going to Sleep"3 sec then |
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sleep. |
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3. |
If push any key in sleep mode, then |
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repeat item 1 to 2. |
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Out of range - 1 |
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H<29.5 |
or |
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1. System blank and show moving WM |
1. System blank and show moving |
" |
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H>92 or |
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"Input Signal out of Range " about 60 |
WM "Input Signal out of Range |
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90>H>82.5 |
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sec. |
always. |
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or V<49 or |
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2. |
Show WM "Going to Sleep "3 sec |
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V>87 |
or |
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then sleep. |
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Vtotal>=1200 |
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3. |
If push any key in sleep mode, then |
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repeat item 1to 2. |
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Out of range - 2 |
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" |
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" |
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DownScaling |
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1. Show moving WM |
Input Signal |
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Ex. |
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1. Show moving WM Input Signal out of |
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Range " 60 sec. |
out of Range "60 sec. |
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1280x1024 |
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2. |
WM disappear after WM 60 sec. |
2. WM disappear after WM 60 sec. |
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(Only |
for |
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3. |
IF push any key then repeat 1-2. |
3. IF push any key then repeat 1-2. |
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HPL1530) |
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Out of range -3 |
1. Show moving WM " Input Signal out |
1. Show moving WM " Input Signal |
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85Hz |
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of Range "60 sec. |
out of Range"60 sec. |
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2. |
After moving WM 60 sec then show |
2. After moving WM 60 sec then |
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WM "Going to Sleep "3 sec then sleep. |
show WM " Going to Sleep"3 sec |
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3. |
If push any key in sleep mode, then |
then sleep. |
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repeat item 1 to 2. |
3. If push any key in sleep mode, |
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then repeat item 1 to 2. |
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12 HP L1740
Go to cover page
Lock/Unlock,Aging, Service/Factory Mode
Front control panel
To Lock/Unlock OSD function
The OSD function can be locked by pressing MANU" 2 "button for more than 10 seconds, the screen shows following windows for 3 seconds. Everytime when you press MANU " 2 " Or AUTO "1 " button, this message Appears On the screen automatically.
The POWER" 5 "& INPUT" 3 " hotkey are still functional for
POWER and INPUT expectively while OSD locked.
Locked OSD function can be released by pressing MANU " 2 " button for more than 10 seconds. While press MANU button for OSD unlocked purpose, the screen will keep showing OSD LOCK OUT until OSD function unlocked and the windows screen automatically showed .
Fig.1
SERVICE MODE
Power off Press and hold the Manu "2" Power -> on " 5 " ,then Into the service mode. Press Manu " 2 " button to bring up OSD menu for confirmation as below:
Access Factory Mode
Power off on the monitor, To hold Auto " 1 "And
+ " + " " 4 " buttons at the same time ,
And press POWER
button to power on the monitor. Press MANU button to
bring up OSD menu for 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 |
: 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 white
|
pattern |
Panel Type |
: If set this to 1,2,3,4,5 then system will force panel type |
|
to LG(QDI), CPT or AU). Set to other value will auto |
|
detect panel based on panel hardware. |
SCALER |
: Read/Write scaler register |
NVRAM |
: Read/Write eeprom address |
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.
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 |
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13 |
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14 |
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HP L1740 |
Trouble shooting |
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Go to cover page |
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The following table lists possible problems, the possible cause of each problem, and the recommended solutions.
Problem |
Possible Cause |
Solution |
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Screen is blank. |
Power cord is |
Connect the power cord. |
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disconnected. |
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Power switch on front |
Press the front panel power |
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panel of the monitor is |
button. |
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turned off. |
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Video cable is |
Connect the video cable |
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improperly connected. |
properly. Refer to |
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Setting Up the Monitor, for |
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more information. |
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Screen blanking utility is active. |
Press any key on the |
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keyboard or move the |
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mouse to inactivate the |
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screen blanking utility. |
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Image appears |
Brightness and contrast |
Press the Auto Adjust button |
blurred, indistinct, or |
are too low. |
on the front panel. If this |
too dark. |
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does not correct the image, |
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press the Menu button to |
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open the Basic OSD Menu, |
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and adjust the brightness |
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and contrast scales as |
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needed. |
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Image is not |
Position may need |
Press the Menu button to |
centered. |
adjustment. |
access the OSD menu. |
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Select Image Control/ |
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Horizontal Position or |
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Vertical Position to adjust the |
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horizontal or vertical |
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position of the image. |
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" Check Signal |
Monitor video cable is |
Connect the 15-pin monitor |
Cable " is displayed |
disconnected. |
video cable to the VGA |
on screen. |
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connector on the computer, |
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or, if connected, check the |
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DVI-D signal cable to the |
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DVI connector on the |
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computer, or the VGA to |
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DVI-I cable to the VGA |
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connector on the computer |
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(DVI available on select |
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models only). Be sure that |
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the computer power is off |
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while connecting the video |
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cable. |
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Out of Range. Set |
Video resolution and/or |
Restart your computer and |
Monitor to 1280 x |
refresh rate are set |
enter Safe Mode. Change |
1024 @ 60Hz is |
higher than what your |
your settings to a supported |
displayed on screen. |
monitor supports. |
setting (see "Factory Preset |
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Display Modes "table in |
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Appendix B). Restart your |
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computer so that the new |
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settings take effect. |
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14 |
Mechanical Instruction |
HPL 1740 |
|
15 |
Go to cover page
Front view
Fig.1
Fig.6
Back view
Fig.2
Fig.7
Step 1.Remove the base
Remove the four screws as Fig.2.Fig.3
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.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.4
Fig.5
Fig.9
16 HP L1740
Go to cover page
Mechanical Instruction
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
Control board
Step 5. Remove the control , scaler and power board
remove the screws and disconnect the connector as shown in Fig.11
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
HP L1740 |
|
17 |
Go to cover page
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.
18 |
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HP L1740 |
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Go to cover page
Electrical Instructions
Table1 Preset Mode Resolution
# |
Resolution |
H-Frequency |
Pixel rate |
V-Frequency |
Comment |
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(Hz) |
(MHz) |
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1 |
640X480 |
31.469K |
25.175 |
59.940Hz |
VGA |
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2 |
640X480 |
37.861K |
31.5 |
72.809Hz |
VESA |
3 |
640X480 |
37.5K |
31.501 |
75Hz |
VESA |
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4 |
720X400 |
31.469K |
28.322 |
70.087Hz |
VGA |
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5 |
800X600 |
37.879K |
40 |
60.317Hz |
VESA |
6 |
800X600 |
48.077K |
50 |
72.188Hz |
VESA |
7 |
800X600 |
46.875K |
49.498 |
75Hz |
VESA |
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8 |
832X624 |
49.726K |
57.284 |
74.551Hz |
MAC |
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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 |
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12 |
1152X870 |
68.68K |
100 |
75.06Hz |
MAC |
13 |
1152X900 |
71.71K |
108 |
76.05Hz |
SUN |
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14 |
1280X1024 |
63.98K |
108 |
60.02Hz |
VESA |
15 |
1280X1024 |
79.97K |
135 |
75.02Hz |
VESA |
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(TABLE 1) |
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2.3 |
Input signal mode for over-scan modes |
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Table2 Over -scan Mode Resolution |
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# |
Resolution |
H-Frequency |
Pixel rate |
V-Frequency |
Comment |
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(Hz) |
(MHz) |
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16 |
640X480 |
43.269K |
36.000 |
85.008Hz |
VESA |
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17 |
800x600 |
53.674K |
56.250 |
85.061Hz |
VESA |
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18 |
1024x768 |
68.677K |
94.500 |
84.997Hz |
VESA |
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19 |
1280x1024 |
91.146K |
157.50 |
85.024Hz |
VESA |
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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 of WHITE-D for sRGB (B)
Apply a 1280*1024 / 60Hz signal with white pattern, then adjust the R, G, B SubGain, for the screen center, the 1931 CIE chromaticity (X, Y) co-ordinates and Y Luminance shall be:
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sRGB |
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x(center) |
0.3127 0.02 |
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y(center) |
0.3291 0.02 |
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Y (nits) |
150 10 |
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Use Minolta CA-110 for color coordinates and luminance check. Luminance is > 140 Nits in the center of the screen at sRGB color temperature.
3.5Adjustment 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 E less than or equal to 15 and average Delta E less than or equal to 10 )
3.6 DDC/CI Function Check (B)
Connect D-sub and DVI-D cable to the monitor. Apply DDC/CI test program, the monitor shall pass DDC/CI test compliance both for
VGA and DVI input.
3.7 USB Function Check (B)
Connecting cable from upstream port of the monitor to PC system with XP OS and attaching external USB devices to downstream ports of the monitor. Apply USB test program, the monitor shall pass USB test compliance.
3.8 Setting for leaving the Factory (B)
a).The OSD Controls shall have the following factory default values after finishing all the 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. OSD Timeout = 30
10. Sleep Timer = OFF
11. Brightness = 90%
12. Contrast = 80%
b.) When adjustment is finished, monitor should be set to 6500K color.
c.) The monitor shall leave the factory with the power switch set to the OFF position
HP L1740 |
|
19 |
Go to cover page
20 HP L1740
Go to cover page
Failure Mode Of 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 Polarizer has bubbles instruction on this manual to eliminate failure by replace LCD panel.
Failure description |
Phenomenon |
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Vertical block defect |
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Polarizer has bubbles |
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Vertical dim lines |
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Foreign material inside polarizer. It shows liner or dot shape.
Vertical lines defect (Always bright or dark)
Concentric circle formed
Horizontal block defect
Bottom back light of LCD is brighter than normal
Horizontal dim lines
Back light un-uniformity
Horizontal lines defect (Always bright or dark)
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Backlight has foreign material. |
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Has bright or dark pixel |
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Black or white color, liner or |
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circular type |
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Display adjustment
HPL 1740 |
|
21 |
Go to cover page
Alignment procedure
1. Turn on HP L1740 LCD monitor.
2.Turn on the Timing/pattern generator. See Fig.1 Resolution :1280x1024
Timing : H= 31.47KHz V=60Hz
3. Preset LCD color Analyzer CA-110
-Remove the lens protective cover of probe CA-A30.
-Set measuring/viewing selector to measuring position for reset analyzer.(zero calibration) as Fig.2
- Turn on the color analyzer (CA-110)
-Press 0-CAL button to starting reset analyzer. See Fig.3
Clear image
Measurement/viewing selector
Fig. 4
10.Setting pattern to full white picture.
11.Press menu " 2 " then select F, by " 3 " button.
12.Press menu " 2 " to bring up submenu as following windows.
Cover (black)
Measurement viewing selector
Fig. 1
Fig. 2
4.Access Factory Mode
Power off on the monitor,
To hold Auto " 1 "And
+ " + " " 4 " buttons at the same time ,
And press POWER
button to power on the monitor. Press MANU button to
bring up OSD menu for confirmation
Factory Mode Indicator
Note: after alignment, please reset OSD to user s mode for normal operation. Otherwise, the monitor won t entering power saving mode and showing full white picture all the time as no video signal supplied. To leave factory mode by restart the monitor.
5. Adjust OSD menu to lower position of screen (i.g. adjust V-position to value " 0 " at submenu of OSD Setting.
6.Setting Brightness and Contrast
-Adjust Brightness to value " 90".
-Adjust Contrast to value " 80" .
7.Switch light probe to Viewing position.
8.Move the Lens barrel forward or backward to get clear image as shown in Fig. 4
9. Switch light probe to Measuring position. It should be able to indicate
9300 K
13.Press MENU buttons to select R G B. 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.Original Panel Color SRGB
15. X=0.3127+/-0.02 Y=0.3291+/-0.02 Y=150+/-10
Alignment hits: 1. R for x value, G for y value, B for Y value 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.
16.Gray scale checking
-Switch Timing/pattern generator to
Pattern: 64 gray scale
Timing: 1024 X 768 60Hz 63.98KHz
-Setting both Brightness 90% and Contrast to 80% (Value).
-Check black and white scale are visible clearly across the screen.
See Fig. 5
Fig. 5
Note: The bright scale will be saturated, if Y is too large. The dark scale will be invisible, if Y is too small. Re-alignment or review
22 HP L1740
Go to cover page
All units that are returned for service or repair must pass the original manufactures safety tests. Safety testing requires both
Hipot and Ground Continuity testing.
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 parallelblade 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:
Condition |
HiPot Test for |
HiPot Test for |
|
Ground Continuity |
|
products where |
products where |
|
Test requirement |
|
the mains input |
the mains input is |
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range is Full |
110V AC(USA |
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range(or 220V |
type) |
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AC) |
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Test |
2820VDC |
1700VDC |
|
Test current: |
voltage |
(2000VAC) |
(1200VAC) |
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25A,AC |
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Test time: |
Test time |
3 seconds |
1 second |
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3 seconds(min.) |
(min.) |
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Resistance |
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required: |
Trip |
set at 100 uA |
5 mA |
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<=0.09+Rohm, |
current |
for Max. |
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R is the |
(Tester) |
limitation; set |
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resistance of |
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at 0.1 uA for |
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the mains cord. |
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Min. Limitation |
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Ramp |
set at 2 |
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time |
seconds |
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(Tester) |
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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
*Turn on the power switch of monitor before Hipot and Ground Continuity testing.
Clip
Clip
(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.
Power outlet
4. Recording |
(Rear view of monitor) |
|
Hipot and Ground Continuity testing records have to be kept for a period of 10 years.
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. An i486 (or above) personal computer or compatible. 2. Microsoft operation system Windows 95/98.
3.EDID43016 release.EXE program.exe (in the(313cd8-10rom6 10103manual) as shown in Fig. 1 4. A/D Alignment kits (3138 106 10079):
inclusion : a. Alignment box x1 (as Fig. 2)
Fig.2
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
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Oct 28, 2004 |
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3138 106 10437 |
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HPL1740 LCD |
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Fig.1 |
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XCH AN GE SERVIC |
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Fig.3 |
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CD-ROM with EDID46.EXE
(DVI-D) to (D-Sub) cable
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HP L17402025 |
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2753 |
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HP L2025 |
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Go to cover page
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
Pin assignment
A. 15-pin D-Sub Connector
B. Input DVI -D Connector pin
Fig.4
24 HP L1740
Go to cover page
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 (EDID3014.6 .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 edid46Release For (EDID301writing block.EXE)4 . 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 or using batteries.
Step 2: Connecting printer cable and video cable of monitor as Fig. 6
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 EDID3014 6 .EXE
This is for initialize alignment box.
4.6 |
(as shown in Fig. 9) which |
: Double click EDID301 icon |
is on the screen of Windows Wallpaper.
Bring up main menu of EDID3014 6 as shown in Fig. 10. This is for initialize alignment box.
8-12v |
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Fig.10 |
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4 6 |
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Fig.9 |
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Note 2: During the loading, EDID30146 |
will verify the EDID data which just |
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loaded from monitor before proceed any further function, once |
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the data structure of EDID can not be recognized, the following |
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Fig.6 |
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error message will appear on the screen as below. Please |
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confirm following steps to avoid this message. |
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1. |
The data structure of EDID was incorrect. |
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DDC IC that you are trying to load data is empty. |
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Wrong communication channel has set at configuration setup |
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windows. |
4. Cables loosed or poor contact of connection.
Fig.7
You can copy the EDID46 to the hard disk and then execute the program with the same steps as above
HP L17402025 |
257 |
Go to cover page
Re-programming Analog DDC IC
Step 1: After initialize alignment box, connecting all cables and box as shown in Fig. 14
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 .
EDID3014.6 DDC application provides the function selection and text change (select & fill out) from Step 1 to Step 9.
8-12V
+ |
Fig.18 |
Fig/14
Step 2: Read DDC data from monitor
1. Click icon as shown in Fig. 15 from the tool bar to bring up
Step 4: Modify DDC data (Monitor Serial No.)
the Channels "Configuration Setup" windows as shown in Fig. 16.
1. Click Next , bring up Fig. 19.
Fig.15
Fig.19
2. Select the DDC2BIas the communication channel. and "Enable Factory mode"
As shown in Fig. 16.
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.17
2. Click Next , bring up Fig. 20.
Fig.20
HP L1740
Go to cover page
6. Click Next , bring up Fig. 24
3. Click Next , bring up Fig. 21.
Fig.24
Fig.21
4. Click Next , bring up Fig. 22
7. Click Next , bring up Fig. 25
Fig.25
Fig.22
5. Click Next , bring up Fig. 23
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
|
HP L17402025 |
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5 |
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HP L2025 |
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277 |
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Go to cover page
Step 5: Write DDC data
1. Configuration should be as Fig. 27.
Fig.27
2. Access Factory Mode
Power off on the monitor, To hold Auto " 1 "And
+ " + " " 4 " buttons at the same time ,
And press POWER
button to power on the monitor. Press MANU button to
bring up OSD menu for confirmation
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 EDID3401.6 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.
46
Fig.29
2. Click . Save
Step 8: Exit DDC program
Pull down the File menu and select Exit as shown in Fig. 30.
46
Fig.30
NOTE: If the Edid46Release run in
Win 95/98with some problem, try to run it in win 2000,
but you should install the EDID_PORT_TOOL first. The other step is the same as described above.
28
Go to cover page
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 EDID3014.6 .EXE on Windows Wallpaper already.) Double click EDID3014.6 icon (as shown in Fig. 32) which is on the screen of Windows Wallpaper.
Bring up main menu of EDID3014.6 as shown in Fig. 33.
Fig.32 |
Fig.33 |
4.6
Step 3: Read DDC data from monitor
1.Click icon from the tool bar to bring up the Channels Configuration Setup windows as shown in Fig. 34.
2.Select the DDC2BIas the communication channel.
and "Enable Factory mode"
3. Click OK button to confirm your selection.
Fig.34
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.36
Fig.37 |
Fig.38 |