ViewSonic VLCDS27955-1W Service Manual

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[Page 1] ViewSonic VLCDS27955-1W

Model No. VLCDS27955-1W/-2W 15” Color TFT LCD Display Service Manual ViewSonic VG510b/s-1 ViewSonic  381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583 (VG510b/s_SM_722 Rev. 1a Apr. 2004) ...

[Page 2] ViewSonic VLCDS27955-1W

Copyright Copyright ¤ 2004 by 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...

[Page 3] ViewSonic VLCDS27955-1W

TABLE OF CONTENTS 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 6. Trouble Shooting Flow Chart 9. Block Diagram 10. Schematic Diagrams 7. Recommended Spare Parts List 1. Precautions and Safety Notices 5. Adju...

[Page 4] ViewSonic VLCDS27955-1W

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 ins...

[Page 5] ViewSonic VLCDS27955-1W

2.1. PRODUCT SPECIFICATIONS LCD panel type 15.0” TFT (15.0” Diagonal) Displayable resolution XGA 1024 x 768 maximum Pixel dimension 0.297 mm horizontal x 0.297 mm vertical LCD display color 16.8M Colors Max. OSD con...

[Page 6] ViewSonic VLCDS27955-1W

2.2. FACTORY SUPPORTING MODES Prim Factory Preset Modes ary Preset VESA 1024 x 768 @ 60 Hz 1. 640 x 350 @ 70Hz, 31.5kHz 2. 640 x 480 @ 60Hz, 31....

[Page 7] ViewSonic VLCDS27955-1W

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 ...

[Page 8] ViewSonic VLCDS27955-1W

5 ViewSonic Corporation Confidential - Do Not Copy VG510b/s 3. Front Panel Function Control Description ...

[Page 9] ViewSonic VLCDS27955-1W

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. 3) ADJUST : To scroll up in sub menu or to increase value of selected item. 4) ADJU...

[Page 10] ViewSonic VLCDS27955-1W

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 P...

[Page 11] ViewSonic VLCDS27955-1W

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. 5. Adjusting Procedure 8 ViewSonic Corporation C...

[Page 12] ViewSonic VLCDS27955-1W

START Use Analog Native mode (Window Pattern ) Picture visible? Yes No A Backlight on? On Off Power LED Green LED & key pad work? Yes No (1)Panel no power (2)Pan...

[Page 13] ViewSonic VLCDS27955-1W

Picture Visible A Picture only appear one second Stable picture & size correct C Yes No Picture jumping Picture over-scaler Picture distortion ...

[Page 14] ViewSonic VLCDS27955-1W

MCU B MCU not p ro g rammed Re-programming Yes No Crystal no OSC (1)MCU not put well (2)Crystal bad (3)Cap of crystal too big/small Yes No MCU 3.3V =3.0~3.6V No Yes Check DC 3.3V CKT Check Reset waveform when...

[Page 15] ViewSonic VLCDS27955-1W

Picture Abnormal but Stable & size correct C Color absent or wron g color Use 256 gray scale with R/G/B white Yes No Segment for s p ecific color Shadowing Yes Check V...

[Page 16] ViewSonic VLCDS27955-1W

NO POWER D Use multi-meter to measure & turn on system 12V ok ? 5V ok ? 3.3V/2.5V ok ? Yes Yes Remove adapter Measure adapter only Adapter ok Change adapter Measur...

[Page 17] ViewSonic VLCDS27955-1W

Item Reference P/N ViewSonic P/N Description of revision(s) 10a RSPKCL032D88FG- E-SK-0412-0085 Vendor P/N removed 10b RSPKCL034D88FG- E-SK-0412-0085 Vendor P/N added 11a GCABA2331D8F--C M-MS-0808-9113 Vendor P/N removed 11b GCABA2331D8FT1C M-MS-0808-...

[Page 18] ViewSonic VLCDS27955-1W

Item Reference P/N ViewSonic P/N Description of revision(s) 10a RSPKCL032D88FG- E-SK-0412-0085 Vendor P/N removed 10b RSPKCL034D88FG- E-SK-0412-0085 Vendor P/N added 11a GCABA2331D8F--- M-MS-0808-9121 Vendor P/N removed 11b GCABA2331D8FT1- M-MS-0...

[Page 19] ViewSonic VLCDS27955-1W

Item ViewSonic P/N Ref. P/N Description Location Q'ty 1 PL-PS-0715-0977 GSTN-2916D8F--A BASE BASE 1 2 M-CV-0830-2498 GCOVD2552D8F--A BASE FRONT COVER BASE FRONT COVER 1 3 M-CV-0830-2499 GCOVD2553D8F--A BASE-BACK COVER BASE-BACK COVER 1 4 M-BK-08...

[Page 20] ViewSonic VLCDS27955-1W

Item ViewSonic P/N Ref. P/N Description Location Q'ty VG510b-1 BOM 13 M-WR-0828-6016 QCNWS0906-8026- OSD-SW WIRE OSD-SW WIRE 1 14 M-WR-0828-6015 QCNWS0904-8038- SPEAKER WIRE SPEAKER WIRE 1 15 #N/A ZTAPEL025S030-- TAPE 100mm*4(PANEL WITH MAIN ME...

[Page 21] ViewSonic VLCDS27955-1W

Item ViewSonic P/N Ref. P/N Description Location Q'ty VG510b-1 BOM 41 #N/A VRMDNVG--202J-A SMT 2KO ±5% 1/16W R115.R142.R150.R151.R152.R3. 6 42 #N/A VRMDNVG--203J-A SMT 20KO ±5% 1/16W R113. 1 43 #N/A VRMDNVG--222J-A SMT 2.2KO ±5% 1/16W R32.R3...

[Page 22] ViewSonic VLCDS27955-1W

Item ViewSonic P/N Ref. P/N Description Location Q'ty 1 PL-PS-0715-0978 GSTN-2916D8F--- BASE BASE 1 2 M-CV-0830-2500 GCOVD2552D8F--- BASE FRONT COVER BASE FRONT COVER 1 3 M-CV-0830-2501 GCOVD2553D8F--- BASE-BACK COVER BASE-BACK COVER 1 4 M-BK-08...

[Page 23] ViewSonic VLCDS27955-1W

Item ViewSonic P/N Ref. P/N Description Location Q'ty VG510s-1 BOM 15 #N/A ZTAPEL025S030-- TAPE 100mm*4(PANEL WITH MAIN METAL),50mm*1(I/F COVER WITH D-SUB METAL),50mm*1(PANEL GROUNDING) 500mm 16 #N/A PCUSS1264T8---- SPONGE 15mm*10mm*10mm 2 17 #...

[Page 24] ViewSonic VLCDS27955-1W

Item ViewSonic P/N Ref. P/N Description Location Q'ty Š-1 BOM 43 #N/A VRMDNVG--222J-A SMT 2.2KO ±5% 1/16W R32.R37. 2 44 #N/A VRMDNVG--301J-A SMT 300O ±5% 1/16W R36. 1 45 #N/A VRMDNVG--302J-A SMT 3.2KO ±5% 1/16W R146. 1 46 #N/...

[Page 25] ViewSonic VLCDS27955-1W

Model Title Date Rev: 8. Exploded Diagram And Spare Parts List Exploded Diagram VG510b/s ViewSonic Corporation 22 ViewSonic Corporation Confidential - Do Not Copy VG510b/s 21 Item ViewSonic P/N Ref. P/N Location Q'ty 1 M-MS-0808-9118...

[Page 26] ViewSonic VLCDS27955-1W

23 ViewSonic Corporation Confidential - Do Not Copy VG510b/s ...

[Page 27] ViewSonic VLCDS27955-1W

INTERFACE BOARD ( DPWBN5559T8---- ) CN1 (DVI-D) COMPUTER GRAPHICS DDC (U12) EEPROM U13 MVXRL U7 MCU MTV312 JP1 TO INVERTER JP2 SWITCH MODE POWER SUPPLY FROM A/D ADAPTOR 12V 15” LCD PANEL 3.3...

[Page 28] ViewSonic VLCDS27955-1W

are 85 C type. 50V type. All resistorwich are not otherwise specified are 1/6W. On/Off Bri PW_GND BRI-ADJ 2,4 INV_EN 2,4 VCC VCC +12VA VCC VCC VDD PW_GND +12VA AGND VAA3RGB VAA2V VDC2V AGND VAA3V AGND +12VA C40 470uF 16v/DIP C30 100uF 16v L2 110uH/DI...

[Page 29] ViewSonic VLCDS27955-1W

#0805 are 85 C type. All C's not otherwise specified are 50V type. All resistorwich are not otherwise specified are 1/6W. Note: All capacitors without specified value VGA_VSYNC VGA_HSYNC VGA_VSYNC V-G DDC5V SDA-VGA V-R V-B SDA-VGA VGA_HSYNC VSYN...

[Page 30] ViewSonic VLCDS27955-1W

are 85 C type. All C's not otherwise specified are 50V type. All resistorwich are not otherwise specified are 1/6W. Note: All capacitors without specified value SDA TxD RxD LED_G LED_O SW2 RxD POWER SW2 SDA POWER TxD RESET GREEN SW3 SCL SCL RESE...

[Page 31] ViewSonic VLCDS27955-1W

Use R147 Location on PCB are 85 C type. All C's not otherwise specified are 50V type. specified are 1/6W. Note: All capacitors without specified value AAGND LEFT_OUT- LEFT_OUT+ RIGHT_OUT- RIGHT_OUT+ AUDIO-CON 4 AUDIO_EN4 AUDIO_MUTE2,4 AUDIO-UPDO...

[Page 32] ViewSonic VLCDS27955-1W

are 85 C type. All C's not otherwise specified are 50V type. All resistorwich are not otherwise specified are 1/6W. Note: SDA-DVI SCL-DVI RX2- RX0- RXC- RX2+ RX1+ RX1- RXC+ RX0+ SCL-DVI SDA-DVI DVI-CON4 RX2- 2 RX2+ 2 RX1- 2 RX1+ 2 RX0- 2 RX0+ 2 ...

[Page 33] ViewSonic VLCDS27955-1W

Option for CPT XG08 RSDS PANEL are 85 C type. All C's not otherwise specified are 50V type. All resistorwich are not otherwise specified are 1/6W. Note: All capacitors without specified value TxA3P TxA3N TxACKP TxACKN TxA2P TxA2N TxA1P TxA1N TxA...

[Page 34] ViewSonic VLCDS27955-1W

Close to Pin30 RSDS PORT-B (NO USE) are 85 C type. All C's not otherwise specified are 50V type. All resistorwich are not otherwise specified are 1/6W. Note: All capacitors without specified value RFG0P RFG0N RFR1P RFG1N RFR1N RFR2P RFG1P RFR2N ...

[Page 35] ViewSonic VLCDS27955-1W

are 85 C type. All C's not otherwise specified are 50V type. All resistorwich are not otherwise specified are 1/6W. Note: All capacitors without specified value L4 BEAD L3 BEAD L2 BEAD L1 BEAD L5 BEAD MODEL UPDATE P/R REV. Nr DWG No. PWB No. M/P...

[Page 36] ViewSonic VLCDS27955-1W

11. PCB Layout Diagrams Main Board 33 ViewSonic Corporation Confidential - Do Not Copy VG510b/s ...

[Page 37] ViewSonic VLCDS27955-1W

Control Board 34 ViewSonic Corporation Confidential - Do Not Copy VG510b/s ...

[Page 38] ViewSonic VLCDS27955-1W

*Readers Response* Dear Readers: Thank you in advance for your feedback on our Service Manual,which allows continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below, for return to ViewSonic Corpora...