ViewSonic VP171s-2,VP171b-2,VLCDS25972-4W,VLCDS25972-5W Service manual

Service Manual

ViewSonic VP171s/b-2

Model No.VLCDS25972-4W/5W

17” Color TFT LCD Display

ViewSonic

( VP171s/b-2_SM_947-Rev. 1a– Dec. 2004 )



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

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

12/08/04

Documents Number

DCN Number ECR Number

4870

Description of Changes EditorRevision SM Editing Date

Initial Release

A. Lu

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Preface

This manual is prepared for the maintenance service for the VP171/s/b series LCD

Panel Monitor. Maintenance procedures described in this manual are intended to isolate

faulty parts and replace them in the field. It also aims to serve as a guide in procuring

replacement parts for this product.

This manual is copyrighted and all rights are reserved. This product may not,

in whole or in part be copied, photocopied, translated or reduced to any electronic or

machine readable form without prior written consent except for copyies retained by

the purchaser for backup purpose.

This manual includes system overview, major system assembly, components

description, and the Troubleshooting makes explanations on how to detect errors.

It also includes a flow chart for checking or correcting faults.

No Warranty or representation, either expressed or implied, is made with

respect to this documentation, its quality, performance, merchantability or

fitness for particular purpose.

No event will the vendor be liable for direct, indirect, special, incidental or

consequential damages arising out of the user or inability to use this product

or documentation.

Notice:

The information found in this manual is subject to change without prior notice. Any

subsequent changes made to the data herein will be incorporated in future edition.

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TABLE OF CONTENTS

1 Introduction

2 Mechanical Construction

3 Procedure of Disassembly

4 Troubleshooting Procedure

5Function Test & Alignment Procedure

6 Firmware Upgrade Procedure

7 DDC Key In Procedure

8 Panel Specification 9 Packing For Shipping

10 Appendix

11PCB Layout 12Schematic Diagrams 13 Recommended Spare Parts List

1 4 8

17 21

30 39

52 61

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1. Introduction

This manual provides the integral information you need to maintain the LCD Monitor, and

the manual is applied to the mode of 1280*1024 resolution and 17 SXGA TFT LCD Monitor.

There are ten topics in this manual, and you can immediately identify problems through the manual.

This manual is for the technicans and people with an electronics background.

Send the product back to the distributor for repairing and do not attempt to do

is complex or isnt mentioned in the

Troubleshooting.

1-1 The Appropriate Operation

- Turn off the product before cleaning.

- Use only a dry soft cloth when cleaning the LCD panel surface.

- Use a soft cloth moistured with mild detergent to clean the display housing.

- Disconnect the power plug from AC outlet if the product is not used for a long period of time.

-Do not touch the LCD panel surface with sharp or hard objects.

- Do not use abrasive cleaners, waxes or solvents for your cleaning.

- Do not operate the product under the following conditions :

1.) Extremely hot, cold or humid environment.

2.) Areas susceptible to excessive dust and dirt.

3.) Near any appliance generating a strong magnetic field.

4.) Place in direct sunlight.

anything which

1-2 Product Highlight

- Dual Analog and Digital Signal Input

- Active matrix TFT LCD Technology

- 1280*1024 addressable pixels

- 30-82kHz Horizontal Frequency

- 50-85Hz V ertical Refresh Rate

- Wide Viewing Angle Technology

- Auto-Adjustment

- Multifunction OSD User Controls

- VESA DPMS Power Saving

- High quality full screen re-scaling capability

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1-3 Technical Specification

LCD T e chnology

Fisrt Source

-Source panel AU Panel (M170EG01 V2)

-Size 17” diagonal screen size

-Type MVA type with L VDS interface

-Pixel 1280*1024 addressable pixels

-Pixel Pitch 0.264mm*0.264mm pixel pitch

-Brightness 300 cd/m2 (Typ after 30 minute warm up)

-Contrast Ratio 500:1 (Typ), 300:1 (M in)

-Viewing Angle(Horizontal) 140 deg @ CR>10

-Viewing Angle (V ertical) 130 deg @ CR>10

-Response Time 8 ms (T r=6ms, Tf =2 ms) (T yp.)

-Backlight lamps 4 CCFL backlight lamps

-Backlight Life 50,000 Hours (Typ.) / 30,000 Hours (Min.)

Display Resolution -1280 pixels(H)*1024 lines(V) Active Display Area -337.9mm(H)*270.3mm(V) Displayable Color -16.2M Colors Horizontal Scan -30 to 82kHz Vertical Refresh -50 to 85 Hz Max. Pixel Clock -135MHz Auto-Adjustment -Yes

Re-Scaling -Yes I/O Connectors -AC power in

-VGA in D-Sub 15 pin *2

-DVI-D Connector *1

Power Saving -VESA DPMS Signaling Ergonomics -Tilt Up 25 degrees minimum

-Tilt Down 5 degrees

-Swivel Right 45 degrees

-Swivel Left 45 degrees

-Height Adjust 0~110 cm

-Pivot 0~90 degrees (Clockwise)

Environmental -Operating Te mperature: 0

~ +40oC/32o ~ 104oF

-Operating Relative Humidity: 20% ~ 90% RH Non-condensing

-Storage T emperature: -20o ~ +60oC/ -4o ~ 140oF

-Storage Relative Humidity: 5% ~ 90% RH Non-condensing

Mounting Interface -VESA Flat Panel Monitor Physical Mounting Interface

Power Supply -Internal Power Supply

-Power Dissipation : 50 Watts (typ.)

Dimension (W*H*D) -392.0mm*350.0mm*238.0mm Weight -6.5 kgs/14.3 lbs

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1-4 Compatible Modes

VP171 (AU Panel: M17EG01 V2):

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2. Mechanical Construction

This section provides the package and exploded overview, replaceable parts list. You can

place an order for correct parts in the recommended parts list.

2-1 Package Overview

Item ViewSonic P/N Ref. P/N Description Q'ty

1 M-LB-0813-0706 35.58203.001 LABEL CARTON 76*76mm 2 DC-00000681 36.61102.003 USER GUIDE+CD VP171b AU EG01 V2 3 A-PC-0106-0272 42.50115.001 CABLE POWER CORD 1830mm SP30+IS14 1 4 A-VC-0101-0261 42.59901.A01 CABLE VGA 15P 1800mm 2*75mm 2-CORE 1 5 A-VC-0101-0262 42.59902.012 CABLE DVI-D 1.8M 2-CORE MOLEX 6 P-00000686 51.00081.009 PE BAG LDPE 570*850*0.1t W/HOLE 1 7 M-MS-0808-8952 51.58314.001 LCD PROTECT FILM 355*290*0.1t mm MYLAR VG700/VG750 1 8

9 P-FM-0602-0583 56.61101.001 CUSHION R EPS VP171 10 P-FM-0602-0584 56.61102.001 CUSHION L EPS VP171 1 11 VP171b-2 DC.61112.001 D.C. VP171b AUO M170 EG01 V2

P-00000683

PACKING PARTS LIST (VP171b-2)

1 1

55.61101.005 CARTON AB-18 465*265*430(h) VP171b 1 1

PACKING PARTS LIST (VP171s-2)

Item ViewSonic P/N Ref. P/N Description Q'ty

1 M-LB-0813-0706 35.58203.001 LABEL CARTON 76*76mm 2 DC-00000688 36.61101.004 USER GUIDE+CD VP171s AU EG01 V2 3 A-PC-0106-0272 42.50115.001 CABLE POWER CORD 1830mm SP30+IS14 4 5 A-VC-0101-0262 42.59902.012 CABLE DVI-D 1.8M 2-CORE MOLEX 6 P-00000334 51.00081.009 PE BAG LDPE 570*850*0.1t W/HOLE 7 M-MS-0808-8952 51.58314.001 LCD PROTECT FILM 355*290*0.1t mm MYLAR VG700/VG750 8 P-00000689 55.61101.006 CARTON AB-18 465*265*430(h) VP171s

9 P-FM-0602-0583 56.61101.001 CUSHION R EPS VP171 10 P-FM-0602-0584 56.61102.001 CUSHION L EPS VP171 11 VP171s-2 DC.61113.001 D.C. VP171s AUO M170 EG01 V2

A-VC-0101-0261

42.59910.A01 CABLE VGA 15P 1800mm 2*75mm 2-CORE

1 1 1 1 1 1 1 1 1 1 1

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2-2 Exploded Overview

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OPEN FRAME IN:100-240V OUT:12V/4.16A"LSE"(NOISE REDUCTION)

ViewSonic Model Number: VLCDS25972-4W Rev: 1a

Item ViewSonic P/N Ref. P/N Description Q'ty

1 C-FP-0301-0373 51.61101.002 FRONT COVER PC+ABS-VS08A VP171b 1 2 C-BC-0302-0497 51.61102.002 REAR COVER PC+ABS-VS08A VP171b 1 3 HW-00000173 61.61101.002 LCD BRKT SECC 1.0t AUO M170EG01 VP171 1 4 B-00000677 80.61104.002 PCBA MAIN BD FOR VP171b AU EG01 V2 1 5 M-00000685 35.61204.002 COSMETIC STRIP ADHESIVE 180*10*0.3(t)mm PC- 1 6 B-PS-0204-0057 44.61103.003 7 CB-00000175 42.61103.A01 W.A. 30P UL20276 #28110mm W/O CORE VP171(COSTDOWN) 1 8 E-00000682 48.62701.006 TFT LCD 17" AUO M170EG01 V2 1

9 B-SB-0221-0700 44.58402.002 PCBA INVERTER;EMAX FOR 17" AUO M170EG01 V0 1 10 M-WR-0828-0717 42.61203.001 W.A. 4P UL1007 #24 250mm VP191(POWER) 1 11 PL-00000176 61.61102.001 SHIELDING PLATE-INV Tineplate 0.3t VP171 1 12 M-WR-0828-0716 42.61202.001 W.A. 10/6P UL1007 #24 50mm VP191(INV) 1 13 M-WR-0828-0718 42.61204.001 W.A. 4P UL1007 #18 VP191(SWT) 1 14 M-WR-0828-0719 42.61205.001 W.A. 3P UL1007 #18 50mm VP191(INLET) 1 15 M-MS-0808-9553 61.61202.001 SHIELDING BRKT-MB SECC 1.0t VP191 1 16 M-SCW-0824-6753 85.4A323.040 SCREW FLATE MECH M3*4 BLACK 7 17 M-SCW-0824-0651 85.1F123.060 SCREW PAN MECH W/SF M3*6 Ni 10 18 M-SCW-0824-6961 85.1H123.040 SCREW PAN MECH W/SPG M3*4 Ni 3 19 M-MS-0808-6287 85.005AG.075 SCREW HEX I/O #4-40*H5*L7.5 Ni NYLOK 6 20 HW-00000177 85.ZA123.040 SCREW WCH/W MECH M3*4 Ni 4 21 M-CV-0830-2426 51.61203.002 OVAL CAP PC+ABS-VS08A VP191b 1 22 PL-BT-0706-0134 51.61210.002 SELECT BUTTON PC+ABS-VS08 VP191b 1 23 M-MS-0808-9539 51.61211.001 LED LENS PMMA VP191 1 24 B-CB-0206-0158 80.61102.001 PCBA CTRL BD FOR VP171 1 25 M-SCW-0824-6827 85.1C124.060 SCREW PAN MECH W/T M4*6 Ni 1 26 M-BK-0805-0023 61.00042.001 LOCK BRKT+CAP SECC 0.8t 1 27 M-SCW-0824-6826 85.1F323.080 SCREW PAN MECH W/SF M3*8 BLACK 4 28 M-MS-0808-8299 51.58711.002 NAMEPLATE ELLIPSE CS-VS08 ViewSonic 1 29 M-MS-0808-8750 51.61103.001 MYLAR ADHESIVEt=0.3mm VP171 1 30 M-CV-0830-2427 51.61204.002 HINGE CAP-1 PC+ABS-VS08 VP191b 1 31 M-CV-0830-2428 51.61205.002 HINGE CAP-2 PC+ABS-VS08 VP191b 1 32 M-CV-0830-2429 51.61206.002 HINGE CAP-3 PC+ABS-VS08 VP191b 1 33 M-MS-0808-7823 51.61207.002 FRONT ARM PC+ABS-VS08 VP191b 1 34 M-MS-0808-7824 51.61208.002 REAR ARM PC+ABS-VS08 VP191b 1 35 M-CV-0830-2430 51.61209.002 BASE COVER PC+ABS-VS08 VP191b 1 36 M-CV-0830-2431 51.61212.002 HINGE CAP-4 PC+ABS-VS08 VP191b 1 37 M-MS-0808-8772 61.61204.001 BASE PLATE SPHC 3.0t Zn 1 38 PL-CL-0710-0033 51.61213.002 CLIP NYLON-VS08 VP191b 3 39 M-MS-0808-7795 51.61214.001 WEAR PLATE (FRONT) VP191 1 40 M-MS-0808-7796 51.61215.001 WEAR PLATE (REAR) VP191 1 41 PL-PD-0714-0091 52.61201.001 RUBBER PAD 27d*2t VP191 4 42 M-MS-0808-8756 61.61103.001 HINGE VP171 1 43 M-SCW-0824-0845 85.YA323.080 SCREW FLAT TAP M3*8 BLACK 3 44 M-SCW-0824-0869 85.4A624.080 SCREW FLAT MECH M4*8 BLACK NYLOK 4 45 M-SCW-0824-0868 85.4A623.080 SCREW FLAT MECH M3*8 BLACK NYLOK 1 46 M-SCW-0824-6755 85.UA123.080 DOUBLE THREADS SCREW PAN TAP M3*8 Ni 4 47 M-SCW-0824-0847 85.5A124.080 SCREW BINDING MECH M4*8 Ni 4 48 M-MS-0808-8797 51.00014.002 FILAMENT TAPE 3M NO.8915 25mm*55M 0.01 49 M-MS-0808-8239 51.59901.001 ACETATE TAPE W=20mm 10cm 50 M-MS-0808-7798 41.53615.001 EMI Tape (80560) 30*50mm 2 51 M-MS-0808-7799 41.54612.001 EMI Tape (80560) 25*30mm 5 52 M-LB-0813-0736 35.58304.001 LABEL BARCODE 40*14 ViewSonic 1 53 DC-00000680 35.61101.004 LABEL SPEC 120*50mm VP171b-4W 1 54 M-LB-0813-0781 35.61203.001 LABEL BAR CODE 50*25mm VP191 1 55 M-MS-0808-7800 35.61202.001 BIRD LOGO AL E015-004 "ViewSonic" 1 56 M-00000685 35.61204.002 COSMETIC STRIP ADHESIVE 180*10*0.3(t)mm PC- 1 57 PL-00000180 52.61101.001 RUBBER 20L*10W*2.0T VP171 2 58 M-MS-0808-9913 52.61202.003 RUBBER KIT SILICONE 20*10*7.0mm 1 59 M-MS-0808-9914 52.61202.002 RUBBER KIT SILICONE 20*10*3.5mm 1 60 PL-00000181 52.59907.005 RUBBER PAD 15*10*1.7t mm 2

EXPLODED PARTS LIST (VP171b-2)

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ViewSonic Model Number: VLCDS25972-5W

Rev: 1a

Item ViewSonic P/N Ref. P/N Description Q'ty

1 C-FP-0301-0357 51.61101.003 FRONT COVER PC+ABS-VS07A VP171s 1 2 C-BC-0302-0508 51.61102.003 REAR COVER PC+ABS-VS06A VP171s 1 3 HW-00000173 61.61101.002 LCD BRKT SECC 1.0t AUO M170EG01 VP171 1 4 B-00000677 80.61104.002 PCBA MAIN BD FOR VP171b AU EG01 V2 1 5 M-00000174 35.61204.003 COSMETIC STRIP ADHESIVE 180*10*0.3(t)mm PC-VS06 VP191s 1 6 B-PS-0204-0057 44.61103.003 OPEN FRAME IN:100-240V OUT:12V/4.16A"LSE"(NOISE REDUCTION) 1 7 CB-00000175 42.61103.A01 W.A. 30P UL20276 #28110mm W/O CORE VP171(COSTDOWN) 1 8 E-00000682 48.62701.006 TFT LCD 17" AUO M170EG01 V2 1

9 B-SB-0221-0700 44.58402.002 PCBA INVERTER;EMAX FOR 17" AUO M170EG01 V0 1 10 M-WR-0828-0717 42.61203.001 W.A. 4P UL1007 #24 250mm VP191(POWER) 1 11 PL-00000176 61.61102.001 SHIELDING PLATE-INV Tineplate 0.3t VP171 1 12 M-WR-0828-0716 42.61202.001 W.A. 10/6P UL1007 #24 50mm VP191(INV) 1 13 M-WR-0828-0718 42.61204.001 W.A. 4P UL1007 #18 VP191(SWT) 1 14 M-WR-0828-0719 42.61205.001 W.A. 3P UL1007 #18 50mm VP191(INLET) 1 15 M-MS-0808-9553 61.61202.001 SHIELDING BRKT-MB SECC 1.0t VP191 1 16 M-SCW-0824-6753 85.4A323.040 SCREW FLATE MECH M3*4 BLACK 7 17 M-SCW-0824-0651 85.1F123.060 SCREW PAN MECH W/SF M3*6 Ni 10 18 M-SCW-0824-6961 85.1H123.040 SCREW PAN MECH W/SPG M3*4 Ni 3 19 M-MS-0808-6287 85.005AG.075 SCREW HEX I/O #4-40*H5*L7.5 Ni NYLOK 6 20 HW-00000177 85.ZA123.040 SCREW WCH/W MECH M3*4 Ni 4 21 M-CV-0830-2452 51.61203.003 OVAL CAP PC+ABS-VS06A VP191s 1 22 PL-BT-0706-0166 51.61210.003 SELECT BUTTON PC+ABS-VS07A VP191s 1 23 M-MS-0808-9539 51.61211.001 LED LENS PMMA VP191 1 24 B-CB-0206-0158 80.61102.001 PCBA CTRL BD FOR VP171 1 25 M-SCW-0824-6827 85.1C124.060 SCREW PAN MECH W/T M4*6 Ni 1 26 M-BK-0805-0023 61.00042.001 LOCK BRKT+CAP SECC 0.8t 1 27 M-SCW-0824-6826 85.1F323.080 SCREW PAN MECH W/SF M3*8 BLACK 4 28 M-MS-0808-8116 51.58711.001 NAMEPLATE ELLIPSE ViewSonic 1 29 M-MS-0808-8750 51.61103.001 MYLAR ADHESIVEt=0.3mm VP171 1 30 M-CV-0830-0297 51.61204.003 HINGE CAP-1 PC+ABS-VS06 VP191s 1 31 M-CV-0830-0298 51.61205.003 HINGE CAP-2 PC+ABS-VS06 VP191s 1 32 M-CV-0830-2453 51.61206.003 HINGE CAP-3 PC+ABS-VS06 VP191s 1 33 M-MS-0808-8751 51.61207.003 FRONT ARM PC+ABS-VS06 VP191s 1 34 M-MS-0808-8752 51.61208.003 REAR ARM PC+ABS-VS06 VP191s 1 35 M-CV-0830-2454 51.61209.003 BASE COVER PC+ABS-VS06 VP191s 1 36 M-CV-0830-2455 51.61212.003 HINGE CAP-4 PC+ABS-VS06 VP191s 1 37 M-MS-0808-8772 61.61204.001 BASE PLATE SPHC 3.0t Zn 1 38 M-MS-0808-8753 51.61213.003 CLIP NYLON-VS06 VP191s 3 39 M-MS-0808-7795 51.61214.001 WEAR PLATE (FRONT) VP191 1 40 M-MS-0808-7796 51.61215.001 WEAR PLATE (REAR) VP191 1 41 PL-PD-0714-0091 52.61201.001 RUBBER PAD 27d*2t VP191 4 42 M-MS-0808-8756 61.61103.001 HINGE VP171 1 43 M-SCW-0824-0845 85.YA323.080 SCREW FLAT TAP M3*8 BLACK 3 44 M-SCW-0824-0869 85.4A624.080 SCREW FLAT MECH M4*8 BLACK NYLOK 4 45 M-SCW-0824-0868 85.4A623.080 SCREW FLAT MECH M3*8 BLACK NYLOK 1 46 M-SCW-0824-6755 85.UA123.080 DOUBLE THREADS SCREW PAN TAP M3*8 Ni 4 47 M-SCW-0824-0847 85.5A124.080 SCREW BINDING MECH M4*8 Ni 4 48 M-MS-0808-8797 51.00014.002 FILAMENT TAPE 3M NO.8915 25mm*55M 0.01 49 M-MS-0808-8239 51.59901.001 ACETATE TAPE W=20mm 10cm 50 M-MS-0808-7798 41.53615.001 EMI Tape (80560) 30*50mm 2 51 M-MS-0808-7799 41.54612.001 EMI Tape (80560) 25*30mm 5 52 M-LB-0813-0736 35.58304.001 LABEL BARCODE 40*14 ViewSonic 1 53 DC-00000687 35.61101.005 LABEL SPEC 120*50mm VP171s-5W 1 54 M-LB-0813-0781 35.61203.001 LABEL BAR CODE 50*25mm VP191 1 55 M-MS-0808-7800 35.61202.001 BIRD LOGO AL E015-004 "ViewSonic" 1 56 M-00000174 35.61204.003 COSMETIC STRIP ADHESIVE 180*10*0.3(t)mm PC-VS06 VP191s 1 57 PL-00000180 52.61101.001 RUBBER 20L*10W*2.0T VP171 2 58 M-MS-0808-9913 52.61202.003 RUBBER KIT SILICONE 20*10*7.0mm 1 59 M-MS-0808-9914 52.61202.002 RUBBER KIT SILICONE 20*10*3.5mm 1 60 PL-00000181 52.59907.005 RUBBER PAD 15*10*1.7t mm 2

EXPLODED PART LIST (VP171s-2)

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

3. Procedure of Disassembly

This section provides disassembly procedures for VP171/s/b LCD Monitor. Before you begin

any of these procedures, be sure to turn off the power, computer system, and other attached

devices; then disconnect the power cable from the electronically outlet. Moreover, when you

disassemble the monitor, be sure to put the screws in a safe place and separate them according

to grouping.

3-1 Disassembly of Stand unit from Monitor

Hinge Cap

Oval Cap



1. Put the monitor facedown. Take off Oval Cap and pry Hinge Cap off.

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85.5A124.080

X 4

Stand unit

2. Unscrew five screws that secure Stand unit and detach Stand unit from the monitor.

85.4A123.080

X 1

3. Unscrew four screws of Base Plate to remove Hinge.

85.4A524.080

Base Plate

X 4

Hinge

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85.YA323.080

Base Cover

X 3

Base Plate

4. Unscrew three screws that secure Base Plate to separate Base Plate from Base Cover.

Front Arm

Rear Arm

X 2

Hinge

5. Unscrew two screws that secure Rear Arm to separate Rear Arm from Hinge.

6. Turn Hinge and unscrew two screws that secure Front Arm to detach Front Arm from Hinge.

85.UA123.080 Hinge

X 2

85.UA123.080

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3-2 Disassembly of Rear Cover

Rear Cover

LCD Panel Module

X 4

85.1F123.080



Rear Cover

1. Unscrew four screws of Rear Cover, then detach LCD Panel module from Rear Cover.

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3-3 Disassembly of Inverter Board, Main Board and Power Board

X 3

85.AA123.030

Shielding Plate

1. Unscrew three screws that secure Shielding Plate and remove Shielding Plate.

85.1F123.060

X 2

Inverter Board

2. Unscrew two screws that secure Inverter Board and disconect three connectors to remove Inverter Board.

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X 7

85.AA123.030

M/B Shielding Bracket

85.4A323.040

3. Disconnect the wire between M/B and Power Board.

4. Unscrew 10 screws that secure M/B Shielding Bracket and Remove the EMI tape to remove M/B Shielding

Bracket.

X 3

EMI Tape

Main Board

85.005AG.075

5. Unscew six hex screws that secure Main Board.

6. Unscrew four screws that secure Main Board to remove Main Board.

7. Disconnect the wires which are connected to Main Board.

X 6

85.1F123.060

X 4

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Power Board

85.1F123.060

Power Board Mylar

8. Unscrew four screws that secure Power Board and disconnect the wire to remove Power Board.

Detach Power Board Mylar.

X 4

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3-4 Disassembly of Front Cover Module, LCD Panel, Switch

and Inlet Wires

Front Cover

Control Board wire

1. Remove two tapes of Control Board wire and detach Front Cover from LCD Bracket.



Switch

Wire

X 1

85.1C124.060

Inlet Wire

2. Unscrew one screw that secures Inlet Wire and disconnect two wires that are connected to Switch Wire.

3. Use the tool to pull and press out Inlet and Switch Wires.

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LCD Panel

85.ZA123.040

X 4

4. Unscrew four screws beside LCD Bracket to detach LCD Panel from LCD Bracket.

LCD Bracket

5. Turn LCD Panel around and remove the tape on the wire to disconnect the wire.

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4. Troubleshooting Procedure

This chapter provides technicians and people who have an electronic background a pri-

mary description about maintaining the product. Moreover, you can get the appropriate opera-

tion to solve some complicated problems of component repairing and professional problems.

4-1 Equipment Needed

- VP171 Monitor

- Philips Screw Driver #101 and #107

- Electronic Hex Nut M5mm

- PC(Personal Computer) with SXGA resolution / Pattern Generator

4-2 Main Procedure

Start

Power-on

Power LED ok ?

Ye s

Is display

performance ok ?

Yes

Is function

adjustment ok ?

A. Power Circuit

Troubleshooting

B. Performance

Troubleshooting

C. Control Function

Troubleshooting

Yes

End

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4-2.1 A. Power Circuit Troubleshooting

Start

Change

Power

Board

Yes

End

Change

Main Board

Yes

4-2.2 B. Performance Troubleshooting

Start

Is screen black ?

Yes

Change

Inverter Board

Change

Main Board

Change

LCD Panel

Is screen white ?

Ye s

Replug/Change

Abnormal Color ?

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Ye s

Yes

FPC Cable

Yes

Change

Main Board

Yes

Change

Main Board

Yes

Change

LCD Panel

Yes

Ye s

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Change

LCD Panel

Yes

Is screen scrolling ?

Is screen flickering ?

Is LCD line defective ?

Bad Uniformity ?

Ye s

Yes

Ye s

Change

VGA Cable

Yes

Change

Main Board

Yes

Change

LCD Panel

Yes

Change

Inverter Board

Change

Main Board

Yes

Change

LCD Panel

Yes

Change

LCD Panel

Yes

Adjust Fine

Have line bar or noise?

Yes

Tune Sharpness or Auto

Change

Main Board

Adjustment

Ghost image ?

Yes

Refer to

Notice 1

Yes

Adjust Fine Tune Sharpness or Auto

Ye s

Refer to

Notice 2

Change

Main Board

Adjustment

Yes

End

Notice :

1. Make sure VGA cable connect to PC directly and not through a Data transfer or Distribution......After this

action if Ghost image disappear, go to Yes; else, go to No.

2. Check the compatibility on the computer. If it is compatibility problem, feedback the information to ViewSonic;

else, go to No.

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4-2.3 C. Control Function Troubleshooting

Start

Change

Control Board

Yes

End

Change

Main Board

Ye s

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5. Function Test and Alignment Procedure

5-1

5-2

5-3

Product

- 17 LCD Monitor

Test Equipment

- Color Video Signal & Pattern (or PC with SXGA resolution)

Hot Key

1). All Mode Reset:

Press  ,   buttons simultaneously and Power on with signal, hold on for 3 seconds. Then the

screen will show All Mode Reset.

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2). Burn In Mode:

Press  ,   buttons simultaneously and Power on without signal, hold on for 3 seconds. Then the

screen will show Burn In Mode. Press   button, you can find the information about this monitor.

3). White Balance:

Set the screen on 640*480@60Hz resolution pure black and white pattern, no other color. Press  ,  

and   simultaneously.

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+ 58 hidden pages

ViewSonic VP171s-2,VP171b-2,VLCDS25972-4W,VLCDS25972-5W Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual