ViewSonic VS11755 Manuale utente

ViewSonic VA1926W-9

Model No. VS11755

19 ColorTFT LCD Display

(Manufacturedate:NOV. 2008)

ServiceManual

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

T96MRADDIWVSNND

T96MRADDIWVSNNN

T96MRADKIWVSNND

T96MRADKIWVSNNN

A01 Dec9, 08

T96MRADTIWVSNND

TABLEOFCONTENTS

1. PrecautionsandSafetyNotices..........................................................................................3

2. Specification.......................................................................................................................6

3. FrontPanel FunctionControl Description .......................................................................8

4. CircuitDescription.............................................................................................................15

5.AdjustingProcedure..........................................................................................................16

6.TroubleShooting Flow Chart............................................................................................23

7. Block Diagrams.................................................................................................................24

8. SchematicDiagrams........................................................................................................25

9. PCB LayoutDiagrams......................................................................................................33

10. ExplodedDiagramandSparePartsList.........................................................................40

11. RecommendedSparePartsList....................................................................................44

12. Differentpartslist........................................................................................................... 77

1. PrecautionsandSafetyNotices

1.1AppropriateOperation

(1)Turnoffthe product beforecleaning.

(2)Useonlyadrysoftclothwhen cleaning theLCD panelsurface.

(3)Useasoft clothsoaked withmilddetergenttoclean the displayhousing.

(4)Useonlyahigh quality, safetyapprovedAC/DC powercord.

(5)Disconnect the powerplug fromthe ACoutletif the product willnotbe used foralong period of time.

(6)If smoke, abnormal noise, orstrange odorispresent, immediatelyswitchthe LCD displayoff.

(7)Do nottouchthe LCD panelsurfacewithsharporhardobjects.

(8)Do not placeheavyobjectson the LCD display,videocable,orpowercord.

(9)Do not useabrasivecleaners, waxesorsolventsforyourcleaning.

(10)Do not operatethe product underthefollowing conditions:

-Extremelyhot,coldorhumidenvironment.

-Areascontainingexcessivedust and dirt.

-Nearanyappliancegeneratingastrong magneticfield.

-Indirectsunlight.

1.2. Caution

No modification of anycircuitshouldbe attempted. Servicework shouldonly

beperformed afteryou arethoroughlyfamiliar

withallof the following safetychecksand servicing guidelines.

1.3. SafetyCheck

Careshouldbe taken whileservicing thisLCD display. Becauseofthe high voltage used inthe invertercircuit,the volta

ge is

exposed insuchareasasthe associated transformercircuits.

1.4. LCD ModuleHandling Precautions

Handling Precautions

(1)Sincefrontpolarizeriseasilydamaged, payattentionnot toscratchit.

(2)Besuretoturnoff powersupplywhen connecting ordisconnecting input connector.

(3)Wipe off waterdropsimmediately.Long contact withwatermaycausediscoloration orspots.

(4)When the panelsurfaceissoiled,wipe it withabsorbent cotton orothersoft cloth.

(5)Sincethe panelismade of glass, it maybreakorcrack if dropped orbumped on hardsurface.

(6)SinceCMOSLSIisused inthismodule, takecareof staticelectricityand ensurehuman earthwhen handling.

(7)Do not open ormodifytheModuleAssembly.

(8)Do not press the reflectorsheet atthe back of themoduleinanydirection.

(9)Inthe eventthat aModulemust be put back intothepacking containerslot afterit wastaken out ofthe

container,do not press the centerof the CCFLReflectoredge. Instead, press at the farendsofthe

CFLReflectoredge softly.Otherwisethe TFTModule maybe damaged.

(10)Atthe insertion orremoval ofthe Signal InterfaceConnector, be surenot torotateortiltthe Interface

Connectorof the TFTModule.

(11)Afterinstallation of the TFTModuleintoan enclosure(LCD monitorhousing,forexample), do not twist or

bend the TFTModuleevenmomentarily.When designing the enclosure,it shouldbe taken intoconsideration

that no bending/twisting forcesmaybe appliedtothe TFT Modulefromoutside.Otherwisethe TFT Module

maybe damaged.

(12)The coldcathode fluorescent lampinthe LCD containsasmallamount ofmercury. Pleasefollowlocal

ordinancesorregulationsfordisposal.

(13)The LCD modulecontainsasmallamount ofmaterialshavingno flammabilitygrade.The LCD module

shouldbe supplied withpowerthat complieswiththe requirementsof Limited PowerSource

(IEC60950 orUL1950), oran exemption shouldbe applied for.

(14)The LCD moduleisdesigned sothat the CCFLinitissupplied byaLimited CurrentCircuit (IEC60950

orUL1950). Do notconnectthe CCFLtoaHazardousVoltage Circuit

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.

2. Specification

2.1Productspecifications

Product Name VA1926w

OracleP/N VA1926W-9

ModelNumber VS11755

OSDLanguages

English,French,German,Italian, Spanish,

Finnish, Japanese, Russian Simplified Chinese,

TraditionalChinese, Korean

TFTLCD Panel and Model # 1st panel:CMOA190A2

Scalar RTD2533VH

Input Signal Analog x1/ Digitalx1

SyncCompatibility SeparateSync/CompositeSync/SOG

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 ForRegion code =P/A/J/K/Sunitsonly

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 ForRegion code =Gunitsonly

Manufactureaddress sticker ForRegion code =Gunitsonly

2.2Interface description

1 5

610

11 15

VideoConnectorPinAssignment

A-1.15 pinD-subconnectorpinassignment

PinNumber PinFunction

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 H/Vsyncground

11 No connection

12 (SDA)

13 Horizontalsync(Compositesync)

14 Vertical sync

15 (SCL)

A-2. 24 pinDVI-Dconnectorpinassignment

PinNo. Signal Name Description

1 RX2- TMDSnegativedifferentialinput,channel2

2 RX2+ TMDSpositivedifferential input, channel 2

3 GND LogicGround

4 Reserved 4 Reserved.No connection

5 Reserved 5 Reserved.No connection

6 DDC-CLK DDC Clock

7 DDC-DAT DDC Data

8 Reserved 8 Reserved.No connection

9 RX1- TMDSnegativedifferentialinput,channel1

10 RX1+ TMDSpositivedifferential input, channel 1

11 GND LogicGround

12 Reserved 12 Reserved.No connection

13 Reserved 13 Reserved.No connection

14 VCCX Power

15 GND LogicGround

16 SENS SENSE Pin,PullHigh

17 RX0- TMDSnegativedifferentialinput,channel0

18 RX0+ TMDSpositivedifferential input, channel 0

19 GND LogicGround

20 Reserved 20 Reserved.No connection

21 Reserved 21 Reserved.No connection

22 GND LogicGround

23 RXC+ TMDSpositivedifferential input, referenceclock

24 RXC- TMDSnegativedifferentialinput,referenceclock

3. FrontPanel FunctionControl Description

“MainMenu Controls

MainMenu

withOSDcontrols

FrontControlPanel

shownbelowindetail

Displaysthe control screen

forthehighlightedcontrol.

Alsotogglesbetweentwo

controlsonsomescreens.

Alsoashortcuttotoggle

analoganddigital

connection.

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.

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 ordowninthe 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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