Viewsonic VG500b-1 Service Manual 1c

Service Manual

ViewSonic VG500b-1-1

Model No. VLCDS24349-1

15” Color TFT LCD Display

ViewSonic

(VG500b-1_SM_574 Rev. 1c Feb. 2004



381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

Copyright

Copyright
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

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.

2003 by ViewSonic Corporation. All rights reserved. No part of this publication may be

¤

Revision History

Revision Date Description Of Changes Approval

1a 10/01/02 Initial Release DCN-2350 K.Yang

1b 10/31/02 Revise DCN-2350

1c 02/10/04 Change Scaler to MRT MV2 DCN-4213 Angela Luh

C.Shen

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TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

5. Adjusting Procedure

6. Trouble Shooting Flow Chart

7. Recommended Spare Parts List

8. Exploded Diagram And Spare Parts List

9. Block Diagram

10. Schematic Diagrams

11. PCB Layout Diagrams

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2

3

7

14

18

22
28
31
34

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1. Precautions and Safety Notices

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 to the user.

WARNINGS

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This monitor should be operated only at the correct power sources indicated on the label on
the rear of the monitor. If you’re unsure of the power supply in your residence, consult your
local dealer or Power Company.

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Use only the special power adapter that comes with this monitor for power input.

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Do not try to repair the monitor by yourself, as it contains no user-serviceable parts. This
monitor should only be repaired by a qualified technician.

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Do not remove the monitor cabinet. There are high-voltage parts inside that may cause
electric shock to human bodies.

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Stop using the monitor if the clean is damaged. Have it checked by a service technician.

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Put your monitor only in a clean, cool, dry environment. If it gets wet, unplug the power cable
immediately and consult your local dealer.

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Always unplug the monitor local cleaning it. Clean the cabinet with a soft, dry cloth.
Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen.

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Do not place heavy objects on the monitor or power cord.

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 voltage, 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.

SERVICE NOTES

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When replacing parts or circuit boards, clamp the lead wires around terminals before

soldering.

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Keep wires away from high voltage, high temperature components and sharp edges.

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Keep wires in their original position so as to reduce interference.

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Adjustment of this product please refer to the user’ manual.

SERVICE TOOLS & EQUIPMENT REQUIRED

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SIGNAL GENERATOR: Chroma 2237 or equivalent

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MULTIMETER Fluke 45 or equivalent

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SCREW DRIVER

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OSCILLOSCOPE Tektronik TDS3054 digital oscilloscope or equivalent

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SOLDER IRON

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2. Specification

2.1PRODUCT SPECIFICATIONS

LCD Panel 15.0” TFT
Power Management Energy Star compliant VESA

Displayable Resolution XGA, 1024x768 (max.)
Pixel Dimension 0.297(H) x 0.297(V) mm
LCD Display Color 16.7M color (max.)

DPMS compatible
<2W

Viewing Angle CR>

10

Horizontal: -60°~+60°
Vertical: -55°~+45°

Tilt -10°~-5°

400:1 typical

Contrast Ratio
Brightness

250:1 minimum
200cd/m² (min)
250cd/m² (typ.)

Response Time Tr: 7ms, Tf: 23ms
Active Display Area 304.1mm(H) x 228.1mm(V)

Temperature Operating: 0°C~+40°C (240h)

Storage: -20°C~+60°C (240h)

Compliance UL, CSA, FCC, CE, CB, BSMI, Energy Star, TUV,

Semko, Nemko, Fimko, Demko, DHHS, MPRII,
TCO95, GOST-R, C-Tick, VCCI, CCC

Power Input Voltage: 100~240 Vac

Consumption: 35Watts (Max.)

2.2 SUPPORTED MODES

Primary Preset: VESA 1024 x 768 @ 60Hz

Factory Preset Modes:

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1. VGA 640x350 @ 70Hz, 25.176MHz

2. VESA 640x480 @ 60Hz, 25.175MHz

3. MAC 640x480 @ 67Hz, 31.500MHz

4. VESA 640x480 @ 72Hz, 31.50MHz

5. VESA 640x480 @ 75Hz, 31.50MHz

6. VESA 720x400 @ 70Hz, 28.320MHz

7. VESA 800x600 @ 56Hz, 36.00MHz

8. VESA 800x600 @ 60Hz, 40.00MHz

9. VESA 800x600 @ 72Hz, 50.00MHz

10. VESA 800x600 @ 75Hz, 49.5MHz

11. MAC 832x624 @ 75Hz, 57.272MHz

12. VESA 1024x768 @ 60Hz, 65MHz

13. VESA 1024x768 @ 70Hz, 75.000MHz

14. VESA 1024x768 @ 72Hz, 78.000MHz

15. MAC 1024x768 @ 75Hz, 80.000MHz

16. VESA 1024x768 @ 75Hz, 78.750MHz

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3. Front Panel Function Control Description

Panel adjustment

3-1 Select 1024 x 768@60Hz mode, and Crosshatch pattern
3-2 Press “ Auto image set up” -------Direct access “2” Key
3-3 Brightness set at maximum
3-4 Switch pattern to full screen “pixel on/off” pattern with R, B color off and Green on.

3-5 Adjust VR01 until whole screen display stable and flicker free.

Green color level set at level 255.

Function Test and Alignment Procedure

15” LCD MONITOR MODEL: VG500b

Test Equipment

Color Video Signal & Pattern ( XGA 1024 x 768 @ 60 Hz 5 white

Hot Key

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ssAll Mode Reset

block Pattern )

Press “ ” and “ power “ buttons simultaneously and “Power on
“ with signal hold on for 3 seconds. Then the left OSD screen will
show “Software Version “

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Press “ ” button , the OSD will find “ Factory Init. ”

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Then “▲” button for 3 seconds , the OSD show “ Memory Recall “ to
initial All Mode.

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Burn In Mode

Press “ “ button , the OSD will show “Burn In Mode Setting ”

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Then set “▲” or “ ▼ “ buttons , you can find “ set Burn In Mode ”
Information about this monitor

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White Balance

Press “▲” “▼ “and “ “ buttons simultaneously for 3 seconds to
set White Balance Mode.

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Please set the screen on 1024x768 @ 60 Hz resolution 5 white block pattern

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Power Lock

Press “ ▼ and “ “ buttons simultaneously for 10 seconds , and

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the Power will be locked. Repeat the action , and the power will

be unlocked.

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OSDLock

Press “▲ “ “ buttons simultaneously for 10 seconds, and the

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OSD will be locked. Repeat the action and the OSD will be unlocked.

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4. Circuit Description

4.1D-SUB CONNECTOR PINASSIGNMENT

Pin No.

Symbol Signal Description

1 R RED 0.7vp-p (VIDEO)
2 G GREEN 0.7vp-p (VIDEO)
3 B BLUE 0.7vp-p (VIDEO)
4 N.C.
5 GND GROUND
6 GND GROUND
7 GND GROUND
8 GND GROUND

9 VCC_+5V PC +5V
10 GND GROUND
11 N.C.
12 DDC_SDA DDC1/2B TTL
13 DDC_SCL DDC1/2B TTL
14 VGA_VSYNC VSYNC TTL positive or negative
15 VGA_HSYNC HSYNC TTL positive or negative

4.2 Main DC+12V Input (J800 on I/F Board)

Pin No.

Symbol Function

1 GND Ground

2 DC+12V Main DC+12V Input

3 GND Ground

4.3 Audio Input Jack (J701 on I/F Board)

Pin No.

Symbol Function

1 Ground

2 L_CH_Audio Input

3 R_CH_Audio Input

4 L_CH_Audio Return

5 R_CH_Audio Return

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4.4 INTERNAL CONNECTOR & PIN ASSIGNMENT

XGA Interface Board (PWB-0535)

CON1 : Connect with Control board

Pin No. Symbol Function

1 Mute

2 SP- Adjust audio volume smaller
3 SP+ Adjust audio volume louder
4 Menu Call out or close the OSD menu or come back to the

5 Down Choose the next one item or value
6 Up Choose the last one item or value
7 Sel Select
8 GND Ground

9 Amber Indicate the system in power saving mode
10 Green Indicate the system in active mode
11 GND Ground
12 Power Power on/off control port

OSD, Audio Mute Function Button

previous menu

CON3 : Connect to the PWB-0537, which is power/audio board

Pin No. Symbol Function

1 SENSOR Detect audio I/P signal
2 GND Ground
3 +12V DC+12V
4 GND Ground
5 CCFL_EN Backlight lamps ON(high)/Off(Low) control
6 GPIO2/PWM2 Brightness adjustments (Low Max./ Hi. Min.)
7 MUTE+ Audio Must control (High means SPK off, Low means On)
8 GND Ground

9 +5V DC+5V
10 +5V DC+5V
11 STDBY Audio Stand-by control (Hi means stand-by, Low means Normal)
12 VOLUME Speaker volume control (0V means Sound off, 1.2V means MAX.)

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CON5 : Output to panel

Pin No. Symbol Function

1 GND Ground
2 GND Ground
3 CLKH- Sampling Clock for line pixels
4 GND Ground
5 GND Ground
6 OB7 Blue data signal of odd pixel
7 OB6 Blue data signal of odd pixel
8 OB5 Blue data signal of odd pixel

9 OB4 Blue data signal of odd pixel
10 OB3 Blue data signal of odd pixel
11 OB2 Blue data signal of odd pixel
12 OB1 Blue data signal of odd pixel
13 OB0 Blue data signal of odd pixel
14 GND Ground
15 OG7 Green data signal of odd pixel
16 OG6 Green data signal of odd pixel
17 OG5 Green data signal of odd pixel
18 OG4 Green data signal of odd pixel
19 OG3 Green data signal of odd pixel
20 OG2 Green data signal of odd pixel
21 OG1 Green data signal of odd pixel
22 OG0 Green data signal of odd pixel
23 GND Grounding
24 OR7 Red data signal of odd pixel
25 OR6 Red data signal of odd pixel
26 OR5 Red data signal of odd pixel
27 OR4 Red data signal of odd pixel
28 OR3 Red data signal of odd pixel
29 OR2 Red data signal of odd pixel
30 OR1 Red data signal of odd pixel
31 OR0 Red data signal of odd pixel
32 GND Ground
33 GND Ground
34 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

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35 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

36 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

37 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

38 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

Pin No. Symbol Function

39 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

40 GND Ground

41 GND Ground

42 GND Ground

43 GND Ground

44 EPOL O/E reference voltage selection

45 HMS2_E Even pixel inverter for power saving and reducing EMI

46 HMS1_O Odd pixel inverter for power saving and reducing EMI

47 DHS_LP Latch pulse for per line

48 STH1 Trigger the first pixel per line

49 GND Ground

50 GND Ground

CON6 : Output to panel

Pin No. Symbol Function

1 GND Ground
2 GND Ground
3 VEEG DC-6V for frame dark
4 VEEG DC-6V for frame dark
5 VDDG DC+18V for frame white
6 VDDG DC+18V for frame white
7 CLKV Sampling Clock for frame line
8 STV1 Trigger the first line per frame

9 VDDD DC_3.3V for panel VCC
10 VDDD DC_3.3V for panel VCC
11 VDDD DC_3.3V for panel VCC
12 VDDD DC_3.3V for panel VCC
13 VDDD DC_3.3V for panel VCC
14 VDDD DC_3.3V for panel VCC
15 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V
16 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V
17 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V
18 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V
19 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V

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20 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V
21 GND Ground
22 GND Ground
23 EB7 Blue data signal of even pixel
24 EB6 Blue data signal of even pixel
25 EB5 Blue data signal of even pixel
26 EB4 Blue data signal of even pixel

Pin No. Symbol Function

27 EB3 Blue data signal of even pixel
28 EB2 Blue data signal of even pixel
29 EB1 Blue data signal of even pixel
30 EB0 Blue data signal of even pixel
31 GND Ground
32 EG7 Green data signal of even pixel
33 EG6 Green data signal of even pixel
34 EG5 Green data signal of even pixel
35 EG4 Green data signal of even pixel
36 EG3 Green data signal of even pixel
37 EG2 Green data signal of even pixel
38 EG1 Green data signal of even pixel
39 EG0 Green data signal of even pixel
40 GND Ground
41 ER7 Red data signal of even pixel
42 ER6 Red data signal of even pixel
43 ER5 Red data signal of even pixel
44 ER4 Red data signal of even pixel
45 ER3 Red data signal of even pixel
46 ER2 Red data signal of even pixel
47 ER1 Red data signal of even pixel
48 ER0 Red data signal of even pixel
49 GND Ground
50 GND Ground

POWER/AUDIO Board (PWB-0537)

JP2 : Connect to the I/F Board

Pin No. Symbol Function

1 Volume Speaker volume control (0V sound off, 1.2V sound Max.)
2 Stdby Audio standby control (High standby, Low normal)
3 DC+5V DC+5V

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4 DC+5V DC+5V
5 GND Ground

7 BRT Brightness adjustment (Low is max., High is Min.)
8 CCFL_EN Backlight lamps enable (ON/high, OFF/low)

9 GND Ground
10 DC+12V DC+12V
11 GND Ground
12 SENSOR Detect audio I/P signal

P1 : Connect to inverter

Pin No. Symbol Function

1 DC+12V DC+12V

2 GND Ground

3 BRT Brightness adjustment (Low is Max., High is Min.)

4 DC+5V DC+5V

5 CCFL_EN Backlight lamps enable (ON/high, OFF/low)

CN701 : Connect to control board, control the audio

Pin No. Symbol Function

1 L- L_CH_SP_-Signal

2 L+ L_CH_SP_+Signal

3 GND_S1 Ground

4 R+ R_CH_SP_-Signal

5 R- R_CH_SP_+Signal

DDC Recorder User Manual

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Connect the recorder (with Keyport II )to the printer port on your PC.

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Insert on the diskette into your PC's floppy drivers, then turn on the PC power.

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A setup main menu will be appear as below :

Select DDC Function Mode

[1

[2 Auto Replace DDC Date
[3 Bar Code : xtttddsssss
[4
[5 [F5] : Check DDC1 [F6] : Check DDC2
[6

[7] Mode Name : L5CNSE29.HWP
[8] Serial NO : sssss
[9] DDC Year : 2003

[A] DDC Weeks : 01

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Recoding Process :

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Choose a correct mode name

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Press [Caps Lock]then key in the bar code number STHTAA00001,
The screen shows a green color sentence "Receive DDC Data OK"

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Be sure both the bar code number and DDC2 data are correct.

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After set power off --on, press[F5]to make sure the DDC1

and bar code number are correct.

Checking Process :

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After SET ON ,Press [F5]then verify DDC1 data .Press[F6] to

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process ,either DDC1 orDDC2 should appear a green color sentence

"Receive DDC Data OK", and which will be disappeared after 10 second

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The following is an example of DDC data :

DDC Data Received : STHTAA00001

And then Press [Enter].

verify DDC2 data .During checking

*DDC 0 1 2 3 4 5 6 7 8 9 A B C D E F
0000 00 FF FF FF FF FF FF 00 5A 63 0A B4 01 01 01 01
0010 1A 0C 01 03 08 1E 17 78 2A 9D 9E 99 58 4C 93 26
0020 21 4C 54 BF EE 00 61 40 01 01 01 01 01 01 01 01
0030 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88
0040 36 00 30 E4 10 00 00 18 00 00 00 FF 00 31 31 50
0050 30 32 32 36 30 30 30 37 39 0A 00 00 00 FD 00 32
0060 4B 1E 3E 08 00 0A 20 20 20 20 20 20 00 00 00 FC
0070 00 56 47 35 30 30 62 0A 20 20 20 20 20 20 00 43

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