ViewSonic VG500b-1 Manuel utilisateur

Service Manual

ViewSonic VG500b-1

Model No. VLCDS24349-1

15” Digital Controlled Color Monitor

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

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

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

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1b10/31/02 Revise DCN-2350 C.Shen

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

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

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

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

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

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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 yourresidence,

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.

1. PRECAUTIONS AND NOTICES

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SERVICE TOOLS & EQUIPMENT REQUIRED

1. SIGNAL GENERATOR: Chroma 2237 or equivalent

2. MULTIMETER Fluke 45 or equivalent

3.SCREWDRIVER

4. OSCILLOSCOPE Tektronik TDS3054 digital oscilloscope or equivalent

5. SOLDER IRON

2.SERVICE TOOL AND EQUIPMENT REQUIRED

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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˚

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: 36Watts (Max.)

3.SPECIFICATIONS

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3.2. SUPPORTING MODES

Primary Preset: VESA 1024 x 768 @ 60Hz

Factory Preset Modes: 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

3.3. D-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 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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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

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

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.)

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

4.INTERNAL CONNECTOR PIN ASSIGNMENT

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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