ViewSonic VG181 User manual

VIDE-V27608
Service Manual
ViewSonic VG181
Model No. VLCDS21594-1
18” Color TFT LCD Display
VG181_SM_104 - Rev. 1 — September 2005)
ViewSonic® 381 Brea Canyon Road, Wainut, California 91789 USA - [phone]

Copyright
Copyright © 1998 by ViewSonic Corporation. Alf 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 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 fo 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
fime 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
Description Of Changes Approval
9/15/00 _| Initial Issue — DCN683 —_
if ; VG181 Service Manual

TABLE OF CONTENTS
PRECAUTIONS AND SARETY NOTICES ws. 03 .cssiccca Nts aie Bae ee a utes 2
BE ATURES siccicsesstis so etatuhe slg eiSena tue aca teuty iedgecscceaaesidecshsndlh Sach enc tb occ szaten decane uligesedlantvaatenandedeaeeNusdea slabs 3
SPECIFICATIONS icc cs Scnscipesestecectdtasatbuecsideed onxetareusdstec Satdecsaudsex'slWanloes dgvechestents ides dSecaithes Citta aczecducds sheteceadsaxds 4
ON SCREEN’ DISPICAY eccescitd is cag sesiceca,ccsedh stnstaaterSocxteet den Sects a he enh easiness 5
FACTORY PRESE P-TIMINGS fsesecjececertivaxssccassreceussosanstuceossbeeteardiessucclcleucasszesueceositeutgcetetvacceusleadinadaadeacdiveuy 6
PIN PASSIGNMEN TES vhs c.csjuescseessictesdbesvadsontesssdoededecsvincdeccentsceabevesed ise ccusdui esses visa wetter artorsa dodusbledeateiablsct 7~8
MAIN BOARD VO CONNECTIONS ou. ccecescesesececesenscnseevsssseasencesssscesesesneataneesesscsenesseneesensseeaesesseeessens 9
THEORY. OF ‘ORERA TION siccessiessccnssstsesastvasvenssseseasscondseos suaseseoats sacsauterstaeaiahae igacesveeses foivardesustedseceveries 10~32
WAVEFORMS 30 iascvcsscsads oud sisces cas dsedel secaseznrsusvessteczt agendas caste stas sade saukce sccbeesoedushleadenetecaavecdbansbahdactadeisxsy 33~39
TROUBLESHOOTING GUIDE wicccisie. cccectbeateccsectecescscbusaccedbuuecvesssdecsesuescenceccccdtestdacssdeaaducniaesdesacobesseers 40~44
SPARE PARTS LISD ssosccssse Si descss sca sadsvuncciassvissieivadeas dyes cscs decyag cuss belde en nace cas badcanyih scbtpacassennlgeeiaes SZccvad docks 45
COMPEETE PARTS: DIS Viivagucs. of. ccdedaccazsesseetacgasiocuectesutueds uu svetesesosodsecsentoal sdeus vabelappaceessstuvesss caiieereeed 46~62
SCHEMATIC DIAGRAMS | oic2c50. 8s scuba saviaartvannarsseseveurea satnede oSensanabetetlactetedbsrtermtezentusaseecaetiel alias 63~69
EXPLODED VIEW AND PARTS LIST. .......ccsccsssssssssssssssssatsssscsossnsersenscaceeacseseseerseseseessenseeneeasensecsensnem outs 70
PRIS TT ORDEAL OL LAD OE TI NE EOL NEY EL EEE LE EM IARI LEA NOVEL EI OE ADELA LEE T OIE IE LE LF I TEE EE ELE I GE CLIN EE
iii VG181 Service Manal

Service Manual ViewSonic
VG181 July 2000 - Version 1.0
Copyright © VIEWSONIC CORPORATION, 2000 All Rights Reserved.
IBM and IBM products are registered trademarks of International Business Machines Corporation.
Macintosh and Power Macintosh are registered trademarks of Apple Computer, Inc.
ViewPanel, ViewSonic, the three birds logo, OnView, ViewMatch, and ViewMeter are registered
trademarks of ViewSonic Corporation.
VESA is registered trademarks of Video Electronics Standards Association. DPMS and DDC are
trademarks of VESA.
Energy Star is a registered trademark of the US Environmental Protection Agency (EPA).
Disclaimer : ViewSonic Corporation shall not be liable for technical or editorial errors or omissions
contained herein ; nor for incidenta! or consequential damages resulting from furnishing this
material, or the performance or use this product.
In the interest of continuing product improvement, ViewSonic Corporation reserves the right to
change product specification without notice. Information in this document may change without
notice.
No part of this document may be copied, reproduced or transmitted by any means for any purpose
without prior written permission from ViewSonic Corporation.
FCC INFORMATION
This equipment has been tested and found to comply with the limits of a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy, and if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that the
interference will not occur in a particular installation. If this equipment does cause unacceptable
interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following
measures -- reorient or relocate the receiving antenna; increase the separation between equipment
and receiver; or connect the into an outlet on a circuit different from that to which the receiver is
connected.
FCC WARNING
To assure continued FCC compliance, the user must use a grounded power supply cord and the
provided shielded video interface cable with bonded ferrite cores. Also, any unauthorized changes or
modifications to Amtrak products will void the user's authority to operate this device. Thus
ViewSonic Corporation will not be held responsible for the product and its safety.
CE CERTIFICATION
This device complies with the requirements of the EEC directive 89/336/EEC with regard to
“Electromagnetic compatibility.”
SAFETY CAUTION
Use a power cable that is properly grounded. Always use the AC cords as follows — USA (UL);
Canada (CSA); Germany (VDE); Switzerland (SEV); Britain (BASEC/BS); Japan (Electric Appliance
Control Act); or an AC cord that meets the local safety standards.
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ViewSonic Service Manual
July 2000 - Version 1.0 VG181
FEATURES
The VG181 is a world class TFT LCD display that includes the following features.
le
Digital On Screen Display Controls
User friendly buttons (71), Select (w/ 4) (2), Power] allowing for picture perfect
quality. Users can define display modes or reset to default settings. The main
menu contains : Contrast / Brightness ; Image Adjust ; Viewmach Color;
Advanced Menu ; Setup Menu ; Memory Recall and Exit.
Power Supply Support
The separate AC adapter accepts voltages from 90~264 Vac (Universal),
allowing for a full range of input AC sources.
Power Saving System
This environmental friendly product can reduce power consumption
by more than 95% in the Active Off mode.
Frequency Range
The display can support video standards from VGA to SXGA, with a Horizontal
frequency range from 30~82kHz and a Vertical frequency range from
50~75 Hz.
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Service Manual
SPECIFICATIONS
LCD Pane!
Maximum Viewing
Angles
Signal Input
Connector
Maximum Resolution
Video Bandwidth
Display Area
Power Voltage
Power Consumption
Operating Conditions
Storage Conditions
Dimensions
ViewSonic
July 2000 - Version 1.0
18.1 inch diagonal viewable screen, Anti-glare TFT Active
Matrix Panel, 0.2805mm pixel pitch
Horizontal 160°CR>10
Vertical 160°CR>10
Video : RGB analog, 0.7/1.0 Vp-p, 75 ohms
Composite Sync, Separate Sync,
Sync On Green, fp: 30-82 kHz, fy. 50-75 Hz
Analog : 15 Pin Mini D-Sub
Digital: 24 Pin DVI_D
1280x1024
135 MHz nominal
359.00 mm (H) x 287.2 mm (V)
90~264Vac @ 50/60 Hz (auto switch), 12Vdc 6A
70 W max.
Temperature :32 to 104 (0 to 40 )
Humidity : 10% to 90% (no condensation)
Altitude : To 10,000 feet
Temperature :-4 to+140 (-20 to+60 )
Humidity : 10% to 90% (no condensation)
Altitude : To 40,000 feet
Physical : 460mm (W) x 458.8mm (H) x 240mm (D)
10.0 kgs
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ViewSonic
July 2000 - Version 1.0
ON SCREEN DISPLAY
Service Manual
VG181
The OSD (On Screen Display) function is supported and controlled by four easy to
use buttons -{1], Select , Select ,
Conitrast/ Brightness
Image Adjust
Viewmaitch Color
Advanced Menu
Set Menu
[2], Power.
Contrast
Brightness
Auto Tune
H/V. Position
H. Size
Phase
Zoom
Color Temp Select
User Color
Scaling
Sharpness
ViewMeter
Input Select
Language Select
OSD Position
OSD Timeout
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Confidential - Do Not Copy

Service Manual ViewSonic
VG181
July
2000
-
Version
1.0
FACTORY PRESET TIMINGS
These timings are preset for the analog & digital me
Timing Horizontal | Horizontal | Vertical Vertical
________—|_Polarity {Frequency} Polarity | Frequency |
VGA 640x350 31.47 kHz 70.09 Hz
VGA 720x400 31.47 70.08
VGA 640x400 31.47 70.09
VGA 640x480 31.47 59.94
VESA 640x480 37.86 72.81
VESA 640x480 37.50 75.00
MAC 640x480 35.00 66.67
VESA 800x600 35.15 56.25
VESA 800x600 37.88 60.32
VESA 800x600 48.08 72.19
VESA 800x600 46.88 75.00
MAC 832x624 49.72 74.55
VESA 1024x768 48.36 60.00
VESA 1024x768 56.48 70.07
VESA 1024x768 58.04 71.92
VESA 1024x768 60.02 75.03
MAC 1024x768 60.24 74.92
VESA 1280x1024 68.981 60.02
VESA 1280x1024 79.98 75.03
VESA 1152x864 67.50 75.00
VESA 1280x960 60.00 60.00
Composite
+
+
+
+
Composite
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ViewSonic
July 2000 - Version 1.0
PIN ASSIGNMENT
Service Manual
VG181
The analog input uses a 15 Pin Mini D-Sub connector.
Green
Blue
Ground
Ground
R-Ground
G-Ground
B-Ground
No Connection
Ground
No Connection
(SDA)
H-Sync (Composite Sync)
V-Sync
(SCL)
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Service Manual
VG181
PIN ASSIGNMENT
The digital input use a 24 Pin DVI_D connector.
Logic Ground
Reserved. No connection
Reserved. No connection
DDC2B Clock
DDC2B Data
Reserved. No connection
oO MAN OT FWD =
— ©
—_, oh
Logic Ground
_
np
Reserved. No connection
—_ ie)
Reserved. No connection
=_— f
Power
ay on
Logic Ground
SENSE Pin, Pull High
ces
Oo ON OD
Logic Ground
nN fo)
Reserved. No connection
N =~
Reserved. No connection
nN NO
Logic Ground
hm bh -& WwW
| Pin | Description
TMDS negative differential input, channel 2
TMDS positive differential input, channel 2
TMDS negative differential input, channel 1
TMDS positive differential input, channel 1
TMDS negative differential input, channel 0
TMDS positive differential input, channel 0
TMDS positive differential input, reference clock
TMDS negative differential input, reference clock
Page 8 ©
Confidential - Do Not Copy
ViewSonic
July 2000 - Version 1.0