ViewSonic VLCDS26064-4W User manual

Model No.
20" Color TFT LCD Display
Service Manual
ViewSonic VP2000s
ViewSonic381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
(VP2000s_SM_892 Rev. 1bMar. 2005)
VLCDS26064-4W

Copyright
Copyright
¤
2005by ViewSonic Corporation. All rights reserved. No partof this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of ViewSonic Corporation.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular
purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time
to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or
changes.
Revision History
Trademarks
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
Optiquest is a registered trademark of ViewSonic Corporation.
DCN Number ECR Number
Documents Number Description of Changes EditorRevision SM Editing Date
1a 05/07/04 Initial Release
A. Lu
1b 03/10/05 A. Lu
4530
Scalar Change to GM1601
5238 4923
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TABLE OF CONTENTS
2. Specification
3. Front Panel Function Control Description
4. Circuit Description
6. Troubleshooting Flow Chart
9. Block Diagram
10. Schematic Diagrams
7. Recommended Spare Parts List
1. Precautions and Safety Notices
5. Adjustment Procedure
8. Exploded Diagram and Spare Parts List
11. PCB Layout Diagrams
1
3
13
19
20
38
41
51
53
54
61
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1. Appropriate Operation
(1) Turn off the product before cleaning.
(2) Use only a dry soft cloth when cleaning the LCD panel surface.
(3) Use a soft cloth soaked with mild detergent to clean the display housing.
(4)Use only a high quality, safety approved AC/DC power cord.
(5)Disconnect the power plug from the AC outlet if the product will not be used for a long period of time.
(6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off.
(7) Do not touch the LCD panel surface with sharp or hard objects.
(8) Do not place heavy objects on the LCD display, video cable, or power cord.
(9) Do not use abrasive cleaners, waxes or solvents for your cleaning.
(10) Do not operate the product under the following conditions:
- Extremely hot, cold or humid environment.
-Areas containing excessive dust and dirt.
- Near any appliance generating a strong magnetic field.
- In direct sunlight.
2. Caution
No modification of any circuit should be attempted. Service work should only be performed after you are thoroughly familiar
with all of the following safety checks and servicing guidelines.
3. Safety Check
Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is
exposed in such areas as the associated transformer circuits.
4. LCDModule Handling Precautions
4.1 Handling Precautions
(1) Since front polarizer is easily damaged, pay attention not to scratch it.
(2)Be sure to turn off power supply when connecting or disconnecting input connector.
(3)Wipe off water drops immediately. Long contact with water may cause discoloration or spots.
(4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth.
(5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface.
(6)Since CMOSLSI isusedinthis module, take care of static electricity and ensure human earth when handling.
(7)Do not open or modify the Module Assembly.
(8)Do not press the reflector sheet at the back of the module in any direction.
(9)In the event that a Module must be put back into the packing container slot after it was taken out of the
container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the
CFL Reflector edge softly. Otherwise the TFT Module may be damaged.
(10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate or tilt the Interface
Connector of the TFT Module.
1. Precautions and Safety Notices
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(11) After installation of theTFT Module intoan enclosure(LCDmonitor housing, for example), do not twist or
bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration
that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise theTFT Module
may be damaged.
(12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local
ordinances or regulations fordisposal.
(13) The LCD module contains a small amount of materials having no flammability grade. The LCD module
should be supplied with power that complies with the requirements of Limited Power Source
(IEC60950 or UL1950), or an exemption should be applied for.
(14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950
or UL1950). Do not connect theCCFL to a HazardousVoltage Circuit.
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A. General specification:
LCD panel suppliers: LG: LM201U04-A3. AUO: M201UN02 V.3
a. Panel size: 20.1-inch (viewable).
b. Driver element: a - Si TFT active matrix.
c. Effective display area: 408.0 (H) X 306.0 (V) mm.
d. Pixel pitch: 0.255 (H) X 0.255 (V) mm.
e. Max. resolution: UXGA (1600X1280 pixel).
f. Display color: 16.7M colors (R, G, B 8-bit data).
g. Response time: LG: 16 ms. (Typical)
AUO: 16 ms (Typical)
h. Color filter arrangement: R/G/B vertical stripe.
i. Black light: Edge – light type with 6CCFLs.
j. Contrast ratio: LG: 400:1
AUO: 700:1
k. Luminance: 250cd/m2(Typical).
l. Luminance variation: 1.54 (MAX.). (Note.1)
LCD panel specification:
m. Viewing angle (CR >10): Horizontal: 170o, Vertical: 170o.
Input signals: a. Analog R / G / B (0.7Vp-p/75 ohm) Positive.
b. Digital R /G / B DVI rev. 1.0 (TMDS single link)
c. H & V separate Sync: TTL level; Polarity: Positive or Negative.
d. H & V composite Sync: TTL level; Polarity: Positive or Negative.
e. SOG (Sync level 0.3Vp-p).
Input connector: a. Analog D-sub 15pin x 1.
b. Digital DVI-I 29 pin x 1. (Analog + Digital)
c. USB up stream x1.(VP201s/b only)
Output connector: a. USB down stream x 4.(VP201s/b only)
Display data channel: DDC2B.
Signal frequency range: a. Horizontal:
a-1. Analog: 30KHz ~ 92KHz.
a-2. Digital: 30KHz ~ 92KHz.
b. Vertical: 50Hz ~ 85*1Hz.
*Note: When the resolution is set to 1600x1200, the maximum vertical
Analog input: 60 Hz.
Digital input: 60 Hz.
c. Pixel clock:
c-1. Analog: 165MHz.
c-2. Digital: 165MHz.
d. Non-interlaced.
Resolution: 1600x1200. (UXGA)
Power supply: AC Input Range: AC 90 to 264V, 50/60Hz ± 3Hz, 1.5A.
Less then 50Ap. For 115VAC.Inrush current
Less then 100Ap. For 230VAC.
Less then 73W. On mode.
Less then 4W. Active off mode.
Power Consumption:
Less then 2W. DC power off.
2. Specification
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refresh rate is:

B. Physical specification:
a. Height: 480.55mm.
b. Width: 448.00mm.
Overall dimension:
c. Depth: 266.65mm.
a. Net weight: 8.5kg.Weight:
b. Gross weight: 11.2kg.
a. Tilt: +25o~ -5o.
b. Swivel: ±45o.
c. Height adjust: 110mm.
Mechanical adjustment:
d. Pivot: 90o.
a. Height: 494mm.
b. Width: 345mm.
Packaging: a. Carton dimension:
c. Depth: 560mm.
Accessories: Power cable 1.8m.
User guide (English).
CD ROM.
Warranty card.
HD15 - HD15 cable.
DVI (D) – DVI (D) cable.
3. Regulatory & Standard certification.
Regulatory standards UL, cUL, FCC-B, CB, CE, ENERGY, NOM, TUV/GS, TUV ERGO (covers
ISO13406-2 & MPRII), TCO’03(for VP201s/VP2000s), TCO99 (for VP201
b
),
NEMKO, SEMKO, DEMKO, FIMKO, GOST-R + 20 ORIGINAL COPIES
HYGIENIC, (SASO), PCBC, VCCI, BSMI, CCC, (PSB), (C-TICK), TUV-S
Note.1: Luminance variation:
FIG.1 Luminance test points
L = 408mm / W = 306mm
10%
50%
90%
10%
50%90%
BU = MAX. Luminance in 9 point (1 ~ 9)
MIN. Luminance in 9 point (1 ~ 9) 1.54
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C. OSD Menu Functions
1. Interface board function test.
1.1 Function keys:Power, 1, ▲, ▼,2.
1.2 Basic function check.
1.2.1 Input 1600x1200 / 60Hz, cross-hatch reverse pattern.
1.2.2 Push “1” & “2” key,select Auto image adjust, Contrast, Brightness, Input select,
Color, Manual image adjust, Setup menu, Memory recall function.
1.2.3 Push “▲” or “▼” key check Contrast, Brightness, Input select, Color, H/V position, H
size, Fine tune, Sharpness, Scaling Language Select, OSD Position OSD Timeout, OSD
Background functions.
1.2.4 Push “2” to cycle among Analog / DVI-A / DVI-D signals.
1.2.5 When the OSD is not active, the “▲” and “▼” of buttons increase/decrease
Contrast or Brightness.
2. Interface power test.
2.1 The test point:
2.1.1 TP251 = NA.
2.1.2 TP252 = 5V ± 5%.
2.1.3 TP253 = 18V ± 5%.
3. OSD function.
Auto Image Adjust2
Contrast/Brightness:
Contrast, Brightness.
Input Select:
D-Sub, DVI-A, DVI-D.
Color Adjust:
SRBG, 9300K, 6500K (default), 5400K, 5000K, User Color (R, G, B).
Information:
Resolution, Horizontal Frequency, Vertical Frequency, Model Number, Serial Number, Web Site.
Manual Image Adjust:
H./V. Position2(H. Position, V. Position), H. Size2, Fine Tune2,
Scaling3(Fill Screen, Fill Aspect Ratio4, 1:1).
Setup Menu:
Language:
English, French, German, Spanish, Italian, Finnish, Japanese, Traditional Chinese, Simplified
Chinese.
Resolution Notice:
Enable, Disable.
Input Priority:
D-Sub, DVI-A, DVI-D, Auto Search.
OSD Position:
H. Position, V. Position.
OSD Timeout:
5SEC, 15SEC, 30SEC, 60SEC
OSD Background:
On, Off.
Memory Recall
Notes:
2These functions are not available in Digital mode; the item is faded out and can't be selected
When auto tuning, the image should not go blank.
3These functions are not available in 1600x1200 mode; the item is faded out and can't be selected.
4When the input signal's aspect ratio is 4:3, the "Fill Aspect ratio" function yields the same result
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as "Fill Screen".

1.1 Set contrast to 70% and brightness to 100%.
1.2 Input a 640x480 / 60Hz, 5-block (5-MOSAIC) pattern (input level 100IRE 0.7Vp-p), then
activate the White Balance function.
Set SRBG/9300K / 6500K / 5400K / 5000K, R G B Gain as shown below:
sRGB 9300K 6500K 5400K 5000K
Analog DVI Analog DVI Analog DVI Analog DVI Analog DVI
R Gain 255 255 255 255 255 255 255 255 255 255
G Gain 255 255 255 255 255 255 255 255 255 255
B Gain 255 255 255 255 255 255 255 255 255 255
2. 9300K alignment:
2.1 Input 1600x1200 / 60Hz & full white pattern at 100IRE.
2.2 Adjust R, G, and B Gain to meet following chromaticity spec:
9300K →x = 0.283 ± 0.005, y = 0.298 ± 0.005, Y > 150cd/m2(Both analog & DVI).
3. 6500K alignment:
3.1 Input 1600x1200 / 60Hz & full white pattern at 100IRE.
3.2 Adjust R, G and B Gain to meet following chromaticity spec:
6500°K →x = 0.313 ±0.005, y = 0.329 ± 0.005, Y > 200cd/m2(Both analog & DVI).
4. 5400K alignment:
4.1 Input 1600x1200 / 60Hz & full white pattern at 100IRE.
4.2 Adjust R, G, and B Gain to meet following chromaticity spec:
5400K →x = 0.335 ± 0.005, y = 0.350 ± 0.005, Y > 180cd/m2(Both analog & DVI).
5. 5000K alignment:
5.1 Input 1600x1200 / 60Hz & full white pattern at 100IRE.
5.2 Adjust R, G and B Gain to meet following chromaticity spec:
5000°K →x = 0.346 ±0.005, y = 0.359 ± 0.005, Y > 180cd/m2(Both analog & DVI).
6. sRGB alignment:
6.1 Input 1600x1200 / 60Hz & full white pattern at 100IRE.
6.2 Adjust R, G and B Gain to meet following chromaticity spec:
sRGB →x = 0.313 ±0.005, y = 0.329 ± 0.005, Y > 200cd/m2(Both analog & DVI).
7. 64 grays and 16 grays pattern check:
7.1 Input a 1600x1200 / 60Hz, 64 gray-level pattern at 100IRE, with brightness set to 100% and
contrast set to 70%
7.2 Verify that under the 9300K / 6500K / 5400K / 5000K settings, no more than 2 of the 64
7.3 Input a 1600x1200 / 60Hz, 16 gray-level pattern at 100IRE, with brightness set to 100% and
contrast set to 100%.
7.4 Verify that under the 9300K / 6500K / 5400K / 5000K settings, no more than 4 of the 16 grays are
D. Image Calibration
1 Initial Settings
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grays are saturated.
saturated.

E. Image test
1. Picture size & position.
1.1 Picture size.
Input analog timing modes 1 ~ 26 and DVI timing modes 1 ~ 25:
H-size: 408mm ±1mm.
V-size: 306mm ±1mm.
(Extra 640x350)
1.2 Screen center.
a. 1600x1200: H ± 1mm, V ± 1mm.
b. Others modes: H ± 1.5mm, V ± 1mm.
1.3 Picture position (refer to FIG.2).
H-position:︱g3-g4︱≦1.5mm.
V-position:︱g1-g2︱≦1.5mm.
2. Luminance test.
2.1 Input a 1600x1200 / 60Hz full white pattern at 100IRE with brightness set to 100% and
Y (Luminance)
Color temperature x y Analog DVI
sRGB 0.313 ± 0.01 0.329 ± 0.01 >200 nit >200 nit
9300K 0.283 ± 0.01 0.298 ± 0.01 >150 nit >150 nit
6500K 0.313 ± 0.01 0.329 ± 0.01 >200 nit >200 nit
5400K 0.335 ± 0.01 0.350 ± 0.01 >180 nit >180 nit
5000K 0.346 ± 0.01 0.359 ± 0.01 >180 nit >180 nit
2.2 Input a1600x1200 / 60Hz full white pattern at 100IRE with brightness set to 100% and
Y (Luminance)
Color temperature Analog DVI
9300K >220 nit >220 nit
6500K >220 nit >220 nit
5400K >220 nit >220 nit
5000K >220 nit >220 nit
3. Picture performance test.
3.1 Picture quality:
Test pattern signal The following image faults shall not be conspicuous:
1 100IRE white raster pattern Seam, Noise, Beat, Flicker
2Cross hatch pattern Ringing, Overshoot, Smear, V-jitter, H-jitter
3 Color bar Color distortion, Noise, Beat, Color tangent
4 Gray scale (16 steps) Noise, Beat, Gamma distortion
51 dot ON / 1 dot OFF pattern Noise, Flicker
6 40IRE gray raster Noise, Beat, Gamma distortion
3.2 DVI performance test.
3.2.1 3.2.2 Test conditions:
a. VG828 digital pattern generator.
b. “TTL” DVI-D single link cable.
3.2.2 Test condition:
a. a. Resolution: 1600x1200; refresh rate: 75KHz vertical / 60Hz horizontal.
b. b. 16, 32, 64, and 256-level horizontal gray scales.
c. c. 16, 32, 64, and 256-level vertical gray scales.
4. Shortcut keys and factory presets
4.1 Shortcut keys: Press the following keys to adjust settings directly, when the OSD is not active.
[1]. Main Menu.
[2]. Select next input. (Sequence: D-SUB →DVI-A → DVI-D)
[UP] or[DOWN]arrow. Directly activate the Contrast menu. Switch to Brightness menu
408mm
306mm
g4
g2
g1
g3
FIG. 2
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contrast set to 70%.
contrast set to 100%.