ViewSonic VG511s, VG512s Schematic

Service Manual

ViewSonic VG511s/VG512s

Model No. VLCDS27955-3W/4W

15” Color TFT LCD Display

ViewSonic

(VG511s/VG512s_SM_742 Rev. 1a Apr. 2004)



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

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.

Revision History

Revision Date Description Of Changes Approval

1a 04/14/04 Initial Release DCN-3756 Angela Lu

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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

7 8 9

14 22 24 25

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1. Precautions and Safety Notices

Prior to using this manual, please ensure that you have carefully followed all the procedures outlined in the user manual

for this product.

Read all of these instructions.

Save these instructions for later use.

Follow all warnings and instructions marked on the product.

Do not use this product near water.

This display should be installed on a solid horizontal base.

When cleaning, use only a neutral detergent cleaner with a soft damp cloth. Do not spray with liquid or aerosol cleaners.

Do not expose this display to direct sunlight or heat. Hot air may cause damage to the cabinet and other parts.

Adequate ventilation must be maintained to ensure reliable and continued operation and to protect the display from overheating. Do not block ventilation slots and openings with objects or install the display in a place where ventilation may be hindered.

Do not install this display near a motor or transformer where strong magnetism is generated. Images on the display will become distorted and the color irregular.

Do not allow metal pieces or objects of any kind fall into the display from ventilation holes.

Slots and openings in the cabinet and the back or bottom are provided for ventilation, to ensure reliable operation of

the product and to protect it from overheating, those openings muse not be blocked or covered.

The openings should never be blocked by placing the product on a bed, sofa, rug, or other similar surface.

This product should never be placed near or over a radiator or heat register.

This product should not be placed in a built-in installation unless proper ventilation is provided.

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2. Specification

2.1. PRODUCT SPECIFICATIONS

LCD panel type Displayable resolution Pixel dimension

LCD display color OSD control

15.0” TFT (15.0” Diagonal) XGA 1024 x 768 maximum

0.297 mm horizontal x 0.297 mm vertical

16.8M Colors Max. AUTO CONFIG, BRIGHTNSS, CONTRAST, COLOR (R, G, B, BLACK LEVEL ADJUST), POSITION(H-POSITION, V-POSITION ),IMAGE (PHASE, CLOCK ), SETUP MENU (RESET,OSD POSITION, SYSTEM INFO )

Manualcontrolbuttons Viewing angle Tilt Contrast ratio Brightness

Response time Active display area

AC/DC adapter

MENU, Select, Adjust(up,down), Power.Mute,+,Horizontal: ± 60 , Vertical: -45~+55. +20°, -5°.

450:1 (typ) , 300:1 (min)

250

cd/m2

(typ), 200

cd/m2

(min)

16ms (typ) tr+tf , 23ms (max) tr+tf

304.1 mm (H) x228.1mm (V) Input: AC 100 ~ 240V, 50 ~ 60 Hz Output: +12 V DC.

Input signal

Video: Analog 0.7 Vp-p. 75 ohms

Sync. : TTL Level, Positive/ Negative, Separate Sync.

Input connector Power management Dimensions ( WxHxD ) Weight

15 Pin D-Sub. yes

34.6 cm x 35.5 cm x 15.6 cm.

2.7 kgs. (LCD Module only)

3.4kgs. (unit)

Accessory Temperature

Color temp (white)

VGA cable, AC/DC adapter, power cord. Operation : 0 ~ 50°C Storage : -20 ~ 60°C

White x 0.313±0.03 , white y 0.329±0.03

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2.2. FACTORY SUPPORTING MODES

Prim

ary Preset VESA 1024 x 768 @ 60 Hz

Factory Preset Modes

1. 640 x 350 @ 70Hz, 31.5kHz

2. 640 x 480 @ 60Hz, 31.5kHz

3. 640 x 480 @ 67Hz, 35.0kHz

4. 640 x 480 @ 75Hz, 37.5kHz

5. 640 x 480 @ 72Hz, 37.9kHz

6. 720 x 400 @ 70Hz, 31.5kHz

7. 800 x 600 @ 56Hz, 35.1kHz

8. 800 x 600 @ 60Hz, 37.9kHz

9. 800 x 600 @ 75Hz, 46.9kHz

10. 800 x 600 @ 72Hz, 48.1kHz

11. 800 x 600 @ 85Hz, 53.7kHz

12. 832 x 624 @ 75Hz, 49.7kHz

13. 1024 x 768 @ 60Hz, 48.4kHz

14. 1024 x 768 @ 70Hz, 56.5kHz

15. 1024 x 768 @ 72Hz, 58.1kHz

16.1024 x 768 @ 75Hz, 60.0kHz

2.3. D-SUB CONNECTOR

This section describes the pin assignment of the LCD’s video connector.

It is called 15 Pin Mini D-sub Connector.

Pin NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Signal Connector

Red Video Signal

Green Video Signal

Blue Video Signal

N.C.

Ground

+5V

Ground

N.C.

DDC data

Horizontal sync signal

Vertical sync signal

DDC clock

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Table 3.1: 15 pin D-sub connector pin assignment

Pin Number Pin Function

1 Red video input 2 Green video input 3 Blue video input 4 No Connection 5 Ground 6 Red video ground 7 Green video ground 8 Blue video ground

9 +5V 10 Ground 11 No connection 12 (SDA) 13 Horizontal sync (Composite sync) 14 Vertical sync 15 (SCL)

Table 3.2: 24 pin DVI-D connector pin assignment

Pin No. Signal Name Description

1 RX2- TMDS negative differential input, channel 2 2 RX2+ TMDS positive differential input, channel 2 3 GND Logic Ground 4 Reserved 4 Reserved. No connection 5 Reserved 5 Reserved. No connection 6 DDC-CLK DDC2B Clock 7 DDC-DAT DDC2B Data 8 Reserved 8 Reserved. No connection

9 RX1- TMDS negative differential input, channel 1 10 RX1+ TMDS positive differential input, channel 1 11 GND Logic Ground 12 Reserved 12 Reserved. No connection 13 Reserved 13 Reserved. No connection 14 VCCX Power 15 GND Logic Ground 16 SENS SENSE Pin, Pull High 17 RX0- TMDS negative differential input, channel 0 18 RX0+ TMDS positive differential input, channel 0 19 GND Logic Ground 20 Reserved 20 Reserved. No connection 21 Reserved 21 Reserved. No connection 22 GND Logic Ground 23 RXC+ TMDS positive differential input, reference clock 24 RXC- TMDS negative differential input, reference clock

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3. Front Panel Function Control Description

3.1 Location of Controls

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1) MENU:

Enter to the OSD adjustment menu. It also used for go back to previous menu for sub-menu,

and the change data don’t save to memory.

2) SELECT:

To confirm the current selection. It also used for go back to previous menu for sub-menu,

and the change data will be save to memory.

ADJUST ▼:

To scroll up in sub menu or to increase value of selected item.

4) ADJUST ▲:

To scroll down in sub menu or to decrease value of selected item

5) POWER SWITCH

Pushing the power switch will turn the monitor on. Pushing it again to turn the monitor off.

6) POWER INDICATOR

The LED will light with green color in normal on state, and will light with orange color in power saving mode.

7) BRIGHTNESS/CONTRAST:

Press button UP/DOWN

8) AUTOIMAGEADIUST:

press button [2]

9) OSD LOCK AND UNLOCK:

press two buttons [1] & [UP] simultaneously for 10 seconds

10) POWER LOCK AND UNLOCK:

press two buttons [1] & [DOWN] simultaneously for 10 seconds

11) ALL RESET:

First,power off the monitor, un-plug the AC cord, then press [2] key at the same time and plug

the AC cord

12) FACTORY MODE:

First,power off the monitor, un-plug the AC cord and be sure the signal cable is connected (D-sub

connected),then press [ ] key at the same time and plug the AC cord.

13) RUN-IN MODE:

▲

First ,power off the monitor, up-plug the AC cord and be sure the cable is not connected(D-Sub not connected),then press [1] key at the same time and plug the AC cord.

14) AUTO COLOR:

press three buttons [1] & [up] & [down], this function only use for 1024x768 60hz patten 42/of

Chroma 2135 signal generator.

NOTE:

chroma Patten 42

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4. Circuit Description

WORKING THEOREM

A. DC-DC CONVERTER

This brick converts the 12V input voltage to 5V for panel use and 3.3V for controller use. It consists of a PWM IC (AP1501), flywheel Diode (D1), buck choke (L2), and capacitor (C70,71).

AP1501 is a PWM generator working at 150Khz.

Self protection features include a two stage frequency reducing current limit for the output

switch and an over temperature shutdown for complete protection under fault condition.

B. A/D converter

The MST 9030A is a highly integrated TFT LCD controller chip with the latest MST advanced imageprocessing technology and an integrated ADC/PLL. The MST 9030A has advanced programmable non-linear parametric cubic based scaling engine with proprietary sharpness adjustment and text enhancement. MST9030A supports both analog and digital interfaced inputs with an internal ADC/PLL. The MST9030A has robust handling of a wide variety of TFT LCD panels and strong support of standard

or non-standard input timings.

. Integrated high speed triple 8-bit ADC/PLL support up to 140MHz for XGA-75Hz

. Advanced image processing with proprietary non linear parametric cubic based scaling engineSupport dual interface

with an integrated ADC/PLL

. Robust auto configuration for input mode detection and clock frequency and phase recovery for standard or

nonstandard input timing

. Support video processing with on-chip 2D de-interlacing and color space conversion

. Support programmable Gamma Correction . GPIO pins for flexible system design

D. MCU:

The MTV312MV64AJ micro-controller is an 8051 CPU core embedded device specially tailored to LCD monitor

applications. It include an 8051 CPU core, 1024-byte SRAM, 14 built-in PWM DACs, VESA DDC interface, 4 channel 6bit A/D converter, a 64 K-byte internal program Flash-ROM .

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5. Adjusting Procedure

First, power off the monitor, un-plug the AC cord and be sure the signal cable is

connected(D-sub connected) , then press “2” key at the same time and plug the AC cord to factory.

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6. Trouble Shooting Flow Chart

START

Use Analog Native mode (Window Pattern )

Green + Orange

Check DC power 12V,5V,3.3V,2.5V ,MCU 5V

Check MCU crystal

Power LED

Picture

visible?

Off On

Backlight

on?

Green

Orange

(1)Panel no power (2)Panel cable not connected (3)H/V sync process to panel

Check Scaler

(1)Check Scaler H/V sync correct? (2)Measure at Scaler side

Yes

Green LED &

key pad work?

Yes

Check MCU or Reprogram MCU

(1)Scaler no power (2)Scaler changed no OSC

Check Inverter

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+ 26 hidden pages