ViewSonic VA503b-1 User manual

ViewSonic VA503b-1
VA503m-1
Model No. VS11248
15” Color TFT LCD Display
(VA503b-1_VA503m-1_SM Rev. 1cNov.2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA –[phone]
Service Manual

ViewSonic Corporation VA503b-1_ VA503m-1
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Copyright
Copyright © 2006by ViewSonic Corporation. All rights reserved. No part of 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.
Trademarks
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1a 05/10/2006 Initial Release Jamie Chang
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1b08/01/2006 VS-E060194 Add 2nd panel source( HSD A02) Jamie Chang
Optiquest is a registered trademark of ViewSonic Corporation.
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
1c11/17/2006 VS-E060417 Add SVA NEC XG04 TB panel source Jamie Chang

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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 4
3. Front Panel Function Control Description 13
4. Circuit Description 19
5. Adjustment Procedure 26
6. Troubleshooting Flow Chart 50
7. Recommended Spare Parts List 51
8. Exploded Diagram and Exploded Parts List 57
9. Block Diagram 67
10. Schematic Diagrams 68
11. PCB Layout Diagrams 75
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1. Precautions and Safety Notices
1.1 SAFETY PRECAUTIONS
This monitor is manufactured and tested on a ground principle that a user’s safety comes
first. However, improper use or installation may cause damage to the monitor as well as
the user. Carefully go over the following WARNINGS before installing and keep this guide
handy.
WARNINGS
．This monitor should be operated only at the correct power sources indicated on the label
on the rear end of the monitor. If you’re unsure of the power supply in your residence,
consult you local dealer or power company.
．Use only the special power adapter that comes with this monitor for power input.
．Do not try to repair the monitor your self as it contains no user-serviceable parts. This
monitor should only be repaired by a qualified technician.
．Do not remove the monitor cabinet. There is high-voltage parts inside that may cause
electric shock to human bodies, even when the power cord is unplugged.
．Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
．Put your monitor only in a clean, dry environment. If it gets wet, unplug the power cable
immediately and consult your service technician.
．Always unplug the monitor before cleaning it .Clean the cabinet with a clean, dry cloth.
Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen.
．Keep the monitor away from magnetic objects, motors, TV sets, and transformer.
．Do not place heavy objects on the monitor or power cord.
1.2 PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections
and the protection afforded by them cannot necessarily be obtained by using replacement
components rated for higher voltages, wattage, etc. Before replacing any of these
components read the parts list in this manual carefully. The use of substitute replacement
parts which do not have the same safety characteristics as specified in the parts list may
create shock, fire ,or other hazards.
1.3 SERVICE NOTES
1. When replacing parts or circuit boards, clamp the lead wires around terminals before
soldering.
2. When replacing a high wattage resistor(more than 1W of metal oxide film resistor) in
circuit board, keep the resistor about 5mm away from circuit board.
3. Keep wires away from high voltage, high temperature components and sharp edges.
4. Keep wires in their original position so as to reduce interference.
5. Usage of this product please refer to also user’s manual.
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1.4 HANDING AND PLACING METHODS
Correct Methods: Incorrect Methods:
Only touch the metal frame of the LCD
panel or the front cover of the monitor. Do
not touch the surface of the polarizer.
Surface of the LCD panel is pressed by fingers
and that may cause “Mura.”
Take out the monitor with cushions Taking out the monitor by grasping the LCD
panel. That may cause “Mura.”
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Place the monitor on a clean and soft foam
pad.
Placing the monitor on foreign objects. That
could scratch the surface of the panel or cause
“Mura.”
Place the monitor on the lap, the panel
surface must be upwards. The panel is placed facedown on the lap. That may cause “Mura.”
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INTRODUCTION
FEATURES VA503b / VA503m
Size 15 “
Luminance (Typ) 250 cd/㎡
Contrast Ratio (Typ) 500:1
Colors 16.2 M colors (6+2bit panel)
Response Time (Typ) 12 ms
Viewing Angle (H/V) 120 ° / 100 °
1st TFT LCD panel
Recommend resolution 1024 x 768 @60Hz
Size 15 “
Luminance (Typ) 200 cd/㎡
Contrast Ratio (Typ) 500 :1
Colors 16.2 M colors (6+2bit panel)
Response Time (Typ) 12 ms
Viewing Angle (H/V) 140 ° / 120 °
2nd TFT LCD panel
Recommend resolution 1024 x 768 @60Hz
Size 15 “
Luminance (Typ) 250 cd/㎡
Contrast Ratio (Typ) 500:1
Colors 16.2 M colors (6+2bit panel)
Response Time (Typ) 12 ms
Viewing Angle (H/V) 120 ° / 100 °
3rd TFT LCD panel
Recommend resolution 1024 x 768 @60Hz
Size 15 “
Luminance (Typ) 250 cd/㎡
Contrast Ratio (Typ) 450:1
Colors 16.2 M colors (6+2bit panel)
Response Time (Typ) 16 ms
Viewing Angle (H/V) 120 ° / 100 °
4th TFT LCD panel
Recommend resolution 1024 x 768 @60Hz
Analog (75ohms, 0.7/1.0 Vp-p) Yes
Input Signal Digital (DVI-D) No
Separate Sync Yes
Composite Sync No
Sync Compatibility
Sync on Green No
PC Yes
Power Mac Yes
Compatibility
TV Box (NextVision 6) Yes
Power Voltage AC 100-240V, 50/60Hz Yes
On Mode(Max / Typ) Under 23 W in max
Power Consumption Active Off Mode (Max) Saving mode< 2W / Off mode <1 W
Tilt ( -5 ° - 22.5 °) Yes
Swivel No
Pivot No
Ergonomics
Height Adjust No
OSD Control [ 1 ] [ 2 ] [ ][▼] [▲] Yes
Physical (W x H x D) 344 x 347.5 x 147 (mm)
13.15 x 13.68 x 5.79 (in)
Dimension Package (W x H x D) 396 x 400 x 141 (mm)
15.59 x 15.75 x 5.55 (in
Physical (Net Weight) 2.7 kg / 5.95 lbs
Weight Package (Gross Weight) 3.7 kg / 8.16 lbs
Temperature (℉/℃) 32℉~104℉/ 0℃~40℃
Operating Condition Humidity (%) 20 % - 90 %
Temperature (℉/℃) -4℉~140℉/ -20℃~60℃
Storage Condition Humidity (%) 5 % - 90 %
Regulation
CB / TCO99 / UL/cUL / FCC-B / ICES 003 / Argentina-TUV/S / NOM / EPA Energy Star /
TUV/Ergo / ISO134062 / TUV/GS / CE / GOST-R / SASO / BSMI / PSB / C-Tick / CCC / RoHS
/ WEEE
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2. Specification

1 GENERAL specification
Test Resolution & Frequency 1024 x 768 @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:
Contrast = 70%, Brightness = 100%
2 VIDEO INTERFACE
Analog Input Connector DB-15 (Analog), refer the appendix A
Default Input Connector Defaults to the first detected input
Video Cable Strain Relief Equal to twice the weight of the monitor for five
minutes
Video Cable Connector DB-15 Pin out Compliant DDC 1/2B
Video Signals 1. Video RGB (Analog), Separate
Video Impedance 75 Ohms (Analog)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals LVDS
DDC 1/2B Compliant with Revision 1.3
Sync Compatibility Separate Sync
Video Compatibility
Shall be compatible with all PC type computers,
Macintosh computers, and after market video
cards
Resolution Compatibility 640 x 350, 640 x 480, 720 x 400 (640 x 400),
800 x 600, 832 x 624, 1024 x 768
Exclusions Not compatible with interlaced video
3 POWER SUPPLY
Internal Power Supply Part Number: 715G1823-I
Input Voltage Range 100 TO 240 VAC
Input Frequency Range 50 TO 60 HERTZ
Short Circuit Protection Output can be shorted without damage
Over Current Protection (1)13V_4.5A@5V_1.5A
(2)5V_6A@13V_2A
Leakage Current 3.5 mA (Max) at 254VAC / 60Hz
Efficiency 80 % typical at 115VAC Full Load
Fuse Internal and not user replaceable
Power Dissipation 4 Watts (typ)
Max Input AC Current 1 Arms @ 90VAC, 0.5 Arms @180VAC
Inrush Current (Cold Start) 60 A @ 240 VAC, 30 A(max) @ 110 VAC
Power Supply Cold Start
Shall start and function properly when under full load, with
all combinations of input voltage, input frequency, and
operating temperature
Power Supply Transient Immunity Shall be able to withstand an ANSI/IEEE C62.41-1980
6000V 200 ampere ring wave transient test with no damage
Power Supply Line Surge Immunity Shall be able to withstand 1.5 times nominal line voltage
for one cycle with no damage
Power Supply Missing Cycle Immunity
Shall be able to function properly, without reset or visible
screen artifacts, when ½ cycle of AC power is randomly
missing at nominal input
Power Supply Acoustics The power supply shall not produce audible noise that
would be detectable by the user. Audible shall define to be
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in compliance with ISO 7779 (DIN EN27779:1991) Noise
measurements of machines acoustics. Power Switch noise
shall not be considered
US Type Power Cable Length = 1.8m. Connects to AC/DC Power Color = Black
Power Saving Operation(Method) VESA DPMS Signaling
Power Consumption ON Mode < 23 W (max)
POWER SAVING < 2W ,OFF < 1W
Recovery Time On Mode = N/A, Active Off < 3 sec
4 ELECTRICAL REQUIREMENT
Horizontal / Vertical Frequency
Horizontal Frequency 30 – 62 KHZ
Vertical Refresh Rate 50 – 85 HZ.
Maximum Pixel Clock 80 MHz
Sync Polarity Independent of sync polarity.
Timing Table
Item Timing Analog
1 640 x 350 @ 70Hz, 31.5kHz Yes
2 640 x 400 @ 70Hz Yes
3 640 x 480 @ 50Hz Yes
4 640 x 480 @ 60Hz, 31.5kHz Yes
5 640 x 480 @ 67Hz, 35.0kHz Yes
6 640 x 480 @ 72Hz, 37.9kHz Yes
7 640 x 480 @ 75Hz, 37.5kHz Yes
8 640 x 480 @ 85Hz, 43.27kHz Yes
9 720 x 400 @ 70Hz, 31.5kHz Yes
10 800 x 600 @ 56Hz, 35.1kHz Yes
11 800 x 600 @ 60Hz, 37.9kHz Yes
12 800 x 600 @ 72Hz, 48.1kHz Yes
13 800 x 600 @ 75Hz, 46.9kHz Yes
14 800 x 600 @ 85Hz, 53.7kHz Yes
15 832 x 624 @ 75Hz, 49.7kHz Yes
16 1024 x 768 @ 60Hz, 48.4kHz Yes
17 1024 x 768 @ 70Hz, 56.5kHz Yes
18 1024 x 768 @ 72Hz, 58.1kHz Yes
19 1024 x 768 @ 75Hz, 60.0kHz Yes
*1. Tolerance ≧± 2kHz.
*2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD message
without blanking.
*3. The image quality of 85Hz mode might be worse than 75Hz.
AUDIO INTERFACE (SPEAKER SPECIFICATION) (For VA503m only)
Line input connection 3.5 mm stereo jack
Line input signal 1.0Vrms
Line input impedance >10 kOhm
Maximum power output (Electric) 1 W @ < 8% distortion
Signal to Noise Ratio 50 dB
Frequency response 500 Hz – 20 Khz
Distortion < 8 % THD (@1kHz)
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Vibration There should be no audible vibration with volume at
100%. (Input signal within 1.0 Vrms)
Screen image There should be no affect on the screen image stability
under any conditions
Connector PC99 requirement Audio in Lime Green pantone # 577C
Cable type / length 3.5mm stereo cable / 1.8m length
Audio DPMS Note: There is no guarantee <1 W power consumption in
Active Off mode, when the Audio Cable is connected
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