ViewSonic VS11755 User manual

ViewSonic VA1916w
Model No. VS11755
19 ColorTFT LCD Display
(Manufacturedate:Dec.2008)
ServiceManual

1
Copyright
Copyright 2008 byViewSonicCorporation.Allrightsreserved.No partof thispublication maybe reproduced,
transmitted, transcribed,stored inaretrievalsystem,ortranslated intoanylanguage orcomputerlanguage,in any
formorbyanymeans,electronic,mechanical,magnetic,optical,chemical,manualorotherwise,withoutthe prior
written permission ofViewSonicCorporation.
Disclaimer
ViewSonicmakesno representationsorwarranties, eitherexpressed orimplied, withrespect tothe contentshereof
and specificallydisclaimsanywarrantyofmerchantabilityorfitness foranyparticularpurpose.Further,ViewSonic
reservesthe righttorevisethispublication and tomakechangesfromtimetotimeinthe contentshereofwithout
obligation of ViewSonictonotifyanyperson ofsuchrevision orchanges.
Trademarks
Optiquest isaregistered trademarkofViewSonicCorporation.
ViewSonicisaregistered trademark of ViewSonicCorporation.
Allothertrademarksused withinthisdocumentarethe propertyoftheirrespectiveowners.
Productdisposalatendofproductlife
The lampinthisproduct containsmercury. Pleasedisposeofinaccordancewithlocal, stateorfederal laws.
Revision History
Revision
SM Editing Date ECR Number DescriptionofChanges Editor
InitialRelease
T96MRYDBIWVSNNN
T96MRYDDIWVWNND
T96MRYDDIWVWNND
A01 Dec9, 08
T96MRYDDIWVWNNN

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TABLEOFCONTENTS
1. PrecautionsandSafetyNotices..........................................................................................3
2. Specification.......................................................................................................................5
3. FrontPanel FunctionControl Description .......................................................................7
4. CircuitDescription.............................................................................................................14
5.AdjustingProcedure..........................................................................................................15
6.TroubleShooting Flow Chart............................................................................................22
7. Block Diagrams.................................................................................................................23
8. SchematicDiagrams........................................................................................................25
9. PCB LayoutDiagrams......................................................................................................32
10. ExplodedDiagramandSparePartsList.........................................................................39
11. RecommendedSparePartsList....................................................................................44
12. Differentpartslist........................................................................................................... 70

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1. PrecautionsandSafetyNotices
Precautionsandsafetynotices
1.1safetyprecautions
Thismonitorismanufactured and tested on aground principlethat auser’ssafetycomesfirst. However,improperuse
orinstallationmaycausedamage tothe monitoraswell asthe user. Carefullygo overthe following WARNINGS
beforeinstalling and keep thisguide handy.
1.2WARNINGS
Thismonitorshouldbe operated onlyatthe correct powersourcesindicated on the labelon the rearendofthe
monitor.If you’reunsureofthe powersupplyinyourresidence, consult you local dealerorpowercompany.
Useonlythe specialpoweradapterthatcomeswiththismonitorforpowerinput.
Do nottry torepairthe monitoryourselfasitcontainsno user-serviceableparts.Thismonitorshouldonlybe repaired
byaqualified technician.
Do notremovethe monitorcabinet.Thereishigh-voltage partsinside thatmaycauseelectricshock tohuman bodies,
even when the powercordisunplugged.
Stopusing the monitorif thecabinetisdamaged.Haveitchecked byaservicetechnician.
Putyourmonitoronlyinaclean, dryenvironment. If it getswet, unplug the powercableimmediatelyand consult your
servicetechnician.
Alwaysunplug the monitorbeforecleaning it.Clean the cabinetwithaclean,dry cloth.Applynon-ammoniabased
cleanerontothe cloth, not directlyontothe glass screen.
Keep the monitorawayfrommagneticobjects,motors,TVsets, and transformer.
Do notplaceheavyobjectson the monitororpowercord.
1.3 Productsafetynotice
Manyelectricaland mechanicalpartsinthischassishavespecial safetyvisualinspectionsand the protection afforded
bythemcannotnecessarilybe obtained byusing replacementcomponentsrated forhighervoltages, wattage,etc.
Beforereplacing anyof thesecomponentsread the partslistinthismanual carefully.The useof substitute
replacement partswhichdo not havethe samesafetycharacteristicsasspecified inthe partslistmaycreateshock,
fire,orotherhazards.
1.4 Service notes
Whenreplacing partsorcircuit boards, clampthe lead wiresaroundterminalsbeforesoldering.
Whenreplacing ahigh wattage resistor(morethan 1Wofmetal oxide filmresistor) incircuitboard, keep the resistor
about 5mm awayfromcircuit board.
Keep wiresawayfromhigh voltage, high temperaturecomponentsand sharpedges.
Keep wiresintheiroriginal position soastoreduceinterference.
Usage ofthisproduct pleaserefertoalsouser’smanual.

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CorrectMethodsIncorrectMethods
Onlytouchthe metal-frameofthe panelorthe
front coverofthe monitor.
Do not touchthe surfaceofthe polarizer.
Surfaceof the panelispressed byfingersand that
maycause “MURA “
Takeout the monitorfromcarton. Takeout the monitorbygrasping theLCD panel.
Thatmaycause “MURA“.
Placethe monitoron aclean &soft foampad . Placethe monitoron foreign objectsand
that couldscratchthe surfaceof panel.

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2. Specification
2.1Productspecifications
Product Name VA1916w
OracleP/N VA1916W-10
ModelNumber VS11755
OSDLanguages: 11
English,French,German,Italian, Spanish,
Finnish, Japanese, Russian Simplified Chinese,
TraditionalChinese, Korean
TFTLCD Panel and Model # 1st panel:CMOA190A2
Scalar RTD2554VH
Input Signal Analog x1
SyncCompatibility SeparateSync
Adapter InternalPowerBoard
PowerCable Yes,
refertoAPPENDIXB:PowerCable
Analog Cable(1.8m,black), withPC2001 and HotPlug
Detect &DDC Yes (Detached cable; refertheAppendixA)
DVI-DCable(1.8m,black)withPC2001 NO
AudioCable(1.8m, black)withPC2001 NO
MICCable(1.8m,black)withPC2001 No
USB Cable(V2.0) No
ViewSonicCD Wizard
Arabic,English,Finnish, Spanish, German,
Italian, Japanese, Swedish, Polish, Korean,
Portuguese, Russian,Turkish, French,Czech,
Hungarian, Simplified Chinese,Traditional
Chinese. Greek, Dutch,Bulgarian, Croatian,
Romanian, Serbian, Slovak, Slovenian
ViewSonicQuickStartGuide One Page
PerfectSuiteCD No
Screen ProtectorMylar Yes
Foot Protectorplastic No
BaseassemblyProcedureCard Yes
Energystart sticker Yes
VistaInstall CardYes
DCR Sticker Yes
ServiceInsert ForRegion code =Munitsonly
WarrantyCard ForRegion code =Gunitsonly
Carton Sticker ForRegion code =Gunitsonly
PE bag ofCarton NO
Manufactureaddress sticker ForRegion code =Gunitsonly

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2.2Interface description
1 5
610
11 15
VideoConnectorPinAssignment
A-1.15 pinD-subconnectorpinassignment
PinNumber
PinFunction
1 Red video input
2 Green videoinput
3 Blue videoinput
4 NoConnection
5 Ground
6 Red video ground
7 Green videoground
8 Blue videoground
9 +5V
10 H/Vsyncground
11 Noconnection
12 (SDA)
13 Horizontalsync(Compositesync)
14 Verticalsync
15 (SCL)

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3. FrontPanel FunctionControl Description
Usethe buttonson the front control paneltodisplayand adjust the OSDcontrolswhichdisplay
on the screen. The OSDcontrolsareexplained atthe top of the next page and aredefined in
“MainMenu Controls”
MainMenu
withOSDcontrols
FrontControlPanel
shownbelowindetail
Displaysthe control screen
forthehighlightedcontrol.
Alsotogglesbetweentwo
controlsonsomescreens.
AlsoashortcuttoAuto
Image Adjust.
Displaysthe
MainMenu or
exitsthe
controlscreen
and saves
adjustments.
Powerlight
Blue =ON
Orange =PowerSaving
StandbyPower
On/Off
Scrollsthrough
menu optionsand
adjuststhe
displayed control.
Alsoashortcut to
displaythe
Contrast
adjustmentcontrol
screen.

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Do thefollowingtoadjustthedisplay setting:
1. Todisplaythe MainMenu,press button [1].
NOTE: AllOSDmenusand adjustment screensdisappearautomaticallyafterabout 15
seconds. Thisisadjustablethrough the OSDtimeoutsettinginthe setup menu.
2. Toselect acontroltoadjust, press ortoscrollup ordown inthe MainMenu.
3. Afterthe desired controlisselected, press button [2].Acontrol screen likethe one shown
belowappears.
The line atthe bottomofthe screen shows
the currentfunctionsof buttons1and 2:
Exit orselect the Brightness control.
4. Toadjust thecontrol, press the up ordownbuttons.
5. Tosavethe adjustmentsand exit themenu, press button [1] twice.
Thefollowing tipsmay help youoptimizeyourdisplay:
•Adjust the computer'sgraphicscardsothatit outputsa1440 x900 @60Hzvideo signalto
the LCD display.(Lookforinstructionson “changing therefreshrate”inthe graphicscard's
userguide.)
•If necessary, makesmalladjustmentsusing H. POSITIONand V.POSITIONuntilthe
screen image iscompletelyvisible. (The blackborderaround the edge of the screen should
barelytouchthe illuminated “activearea”of the LCD display.)

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MainMenu Controls
Adjust the menu itemsshownbelowbyusing the up and downbuttons.
Control Explanation
Auto ImageAdjust automaticallysizes, centers, and fine tunesthe video signal
toeliminatewaviness and distortion. Press the [2] buttontoobtainasharper
image.
NOTE: AutoImage Adjust workswithmost commonvideo cards. Ifthis
functiondoesnot work on yourLCD display,then lowerthe video refreshrate
to60 Hzand set theresolution toitspre-setvalue.
Contrast adjuststhe differencebetween the image background (black level)
and the foreground (whitelevel).
Brightness adjustsbackground black level of the screen image.
ColorAdjust providesseveral coloradjustmentmodes,including preset color
temperaturesand aUserColormode whichallowsindependent adjustment of
red (R), green (G),and blue (B).The factorysetting forthisproductis6500K
(6500 Kelvin).
sRGB-Thisisquicklybecoming the industry standardforcolormanagement,
withsupport being included inmanyof the latest applications. Enabling this
setting allowsthe LCD displaytomoreaccuratelydisplaycolorsthe waythey
wereoriginallyintended. Enabling the sRGBsetting will causethe Contrast and
Brightness adjustmentstobe disabled.
9300K-Addsblue tothe screen image forcoolerwhite(used inmost office
settingswithfluorescentlighting).
6500K-Addsred tothe screen imageforwarmerwhiteand richerred.
5400K-Addsgreen tothe screen image foradarkercolor.
User Color Individualadjustmentsforred (R), green (G), and blue (B).
1. Toselect color(R,G orB) press button [2].
2. Toadjust selected color,press and.
Important: If you selectRECALL fromtheMainMenu whenthe productisset
toaPresetTiming Mode, colorsreturntothe 6500Kfactory preset.