ViewSonic VG500b-1,VLCDS24349-1 Service manual

Service Manual

ViewSonic VG500b-1

Model No. VLCDS24349-1

15” Digital Controlled Color Monitor

ViewSonic

(VG500b-1_SM_574-Rev. 1.0-October 2002)



381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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

ViewSonic is a registered trademark of ViewSonic Corporation. All other trademarks used within this document are the property of their respective owners.

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

C.Shen

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TABLE OF CONTENTS

1. Precautions and notices ..................................................................1

2. Service Tool and Equipment Required........................................2

3. Specifications...............................................................................3

4. Internal Connector Pin Assignment.................................................6

5. Troubleshooting Flow Chart.....................................................10

6. Adjustment................................................................................14

7. Theory of Operation...................................................................15

8. Electrical Parts List..................................................................16

9.. Exploded Diagram and Mechanical Parts List........................19

10. Block Diagram.........................................................................21

11. Schematic Diagrams.................................................................22

12. PCB Layout DiagramS..............................................................31

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PRECAUTIONS AND NOTICES

1. PRECAUTION AND NOTICES

SAFETY PRECAUTIONS

This monitor is manufactured and tested on a ground principle that a user’s safety comes

first. However, improper used or installation may cause damage to the monitor as well as

to the user.

WARNINGS:

z 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.

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

z Do not remove the monitor cabinet. There are high-voltage parts inside that may cause

electric shock to human bodies.

z Stop using the monitor if the cabinet is damaged. Have it checked by a service

technician.

z Put your monitor only in a clean, cool, dry environment. If it gets wet, unplug the power

cable immediately and consult your local dealer.

z 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.

z 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

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

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

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

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

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2. SERVICE TOOL AND EQUIPMENT REQUIRED

SERVICE TOOLS & EQUIPMENT REQUIRED

1. SIGNAL GENERATOR: Chroma 2237 or equivalent

2. MULTIMETER Fluke 45 or equivalent

3. SCREW DRIVER

4. OSCILLOSCOPE Tektronik TDS3054 digital oscilloscope or equivalent

5. SOLDER IRON

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SPECIFICATIONS

3.1 PRODUCT SPECIFICATIONS

LCD Panel 15.0” TFT

Power Management ENERGY Star compliant VESA

DPMS compatible <2W

Displayable Resolution XGA, 1024x768 (max.)

Pixel Dimension 0.2907(H) x 0.2907(V) mm

LCD Display Color 16.7M color (max.)

Viewing Angle CR>10

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

Tilt -5˚~20˚

Contrast Ratio Brightness

400:1 typical 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˚

Storage: -20˚C~+60˚

C C

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

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

Power Input Voltage: 100~240 Vac

Consumption: 36 Watts (Max.)

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3.2. SUPPORTING MODES

Primary Preset: VESA 1024 x 768 @ 60Hz

Factory Preset Modes:

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

3.3. D-SUB CONNECTOR PINASSIGNMENT

1. VGA 640x350 @ 70Hz, 25.176MHz

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 GND GROUND 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

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15 VGA_HSYNC HSYNC TTL positive or negative

3.4 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

3.5 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. INTERNAL CONNECTOR PIN ASSIGNMENT

XGA Interface Board (LIF-007)

JP2 (T-S12BZR): Connect with Control board

Pin No. Symbol Function

1 Mute OSD, Audio Mute Function Button 2 SP- Adjust audio volume smaller 3 SP+ Adjust audio volume louder

4 Menu

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

CON220 (T-B12B-ZR): Connect to the LOR-002, 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.)

Call out or close the OSD menu or come back to the previous menu

CN501 (IL-FHR-50S-HF): 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

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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

35 VDDA

36 VDDA

37 VDDA

38 VDDA

39 VDDA

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

Pin No. Symbol Function

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

CN502 (IL-FHR-50S-HF): 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

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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 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 (LOR-002)

JP2 (T-B12B-ZR): 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 4 DC+5V DC+5V 5 GND Ground 6 MUTE+ Audio mute control (Voltage High speaker off, Low speaker on) 7 BRT Brightness adjustment (Low is max., High is Min.) 8 CCFL_EN Backlight lamps enable (ON/high, OFF/low)

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

CN830 (S5B-PH-K): 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 (S5BPH-K): 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

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ViewSonic VG500b-1,VLCDS24349-1 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual