ViewSonic VX1940W-2 User manual

19 LCDViewSonicVX1940W-2
-1
ViewSonicCorporation
Service
Service
Service
TABLE OFCONTENTS
Description P
ageDescription
Page
SAFETYNOTICE
ANYPERSONATTEMPTINGTOSERVICETHISCHASSISMUSTFAMILIARIZEHIMSELFWITH
THECHASSISAND BEAWAREOFTHENECESSARYSAFETYPRECAUTIONSTOBE USED
WHENSERVICINGELECTRONICEQUIPMENTCONTAININGHIGHVOLTAGES.
CAUTION:USEASEPARATEISOLATIONTRANSFOMERFORTHISUNITWHENSERVICING
7
.
T
roubleshootingflowchart
…………………...
3
3
8..MechanicalInstructions.………………….......35
9. Exploded diagram……………........................41
10.BOMList….………………………………….43
11.Differentpartslist……………………………….57
TableOfContents.......……..............................…........1
Revision List.…........................................……......2
Precautionsand SafetyNotices…………............……......3
1.MonitorSpecification.............................……….....4
2.LCD MonitorDescription……….......13
3. Frontpanelfunctioncontroldescription....................13
3.1 Front PanelHardwareControls………………..........13
3.2Functiondescriptions.....................…...........14
4. Input/OutputSpecification…………………..………..16
5.SchematicDiagram.……………………..................19
5.1Mainboard.……………………..................19
5.2Powerboard.……………………..................24
5.3OSDKeyPAD.……………………..................27
6.PCBlayoutdiagrams.……………………..................27

19 LCDViewSonicVX1940W-2
-2
ViewSonicCorporation
Revision List
Version ReleaseDate RevisionHistory TPV Model
T96MNBDKIWVSNNN
A00 NOV-5-2008 InitialRelease T96MNBDKIWVSNND

19 LCDViewSonicVX1940W-2
-3
ViewSonicCorporation
Precautionsandsafetynotices
safety precautions
Thismonitorismanufacturedand testedonagroundprinciplethatauser’ssafetycomesfirst. However,
improperuseorinstallation maycausedamagetothe monitoraswellasthe user.Carefullygo overthefollowing
WARNINGSbeforeinstallingandkeepthisguidehandy.
WARNINGS
Thismonitorshouldbe operatedonlyat thecorrectpowersourcesindicatedonthelabelon the rearendofthe
monitor. If you’reunsureofthepowersupplyinyourresidence, consult youlocaldealerorpowercompany.
Useonlythespecialpoweradapterthat comeswiththismonitorforpowerinput.
Donottrytorepairthemonitoryourselfasitcontainsnouser-serviceableparts.Thismonitorshouldonlybe
repairedbyaqualifiedtechnician.
Donotremovethemonitorcabinet. Thereishigh-voltagepartsinsidethat maycauseelectricshocktohuman
bodies, even when the powercordisunplugged.
Stopusingthe monitorifthecabinet isdamaged.Haveitchecked byaservicetechnician.
Put yourmonitoronlyinaclean,dryenvironment. If itgetswet,unplugthepowercableimmediatelyandconsult
yourservicetechnician.
Alwaysunplug the monitorbeforecleaningit.Cleanthe cabinetwithaclean,drycloth.Applynon-ammonia
based cleanerontothecloth, notdirectlyontothe glassscreen.
Keepthemonitorawayfrommagneticobjects,motors,TVsets, and transformer.
Donot placeheavyobjectson themonitororpowercord.
Productsafety notice
Manyelectricaland mechanicalpartsinthischassishavespecialsafetyvisualinspectionsand the protection
affordedbythemcannotnecessarilybeobtained byusing replacementcomponentsratedforhighervoltages,
wattage,etc.Beforereplacinganyofthesecomponentsread thepartslistinthismanualcarefully.The useof
substitutereplacementpartswhichdonot havethesamesafetycharacteristics asspecified inthe partslistmay
createshock, fire,orotherhazards.
Servicenotes
Whenreplacingpartsorcircuitboards,clamptheleadwiresaround terminalsbeforesoldering.
Whenreplacingahighwattageresistor(morethan 1Wofmetaloxide filmresistor) incircuitboard,keepthe
resistorabout5mmawayfromcircuitboard.
Keepwiresawayfromhigh voltage, hightemperaturecomponentsandsharpedges.
Keepwiresintheiroriginalposition soastoreduceinterference.
Usage ofthisproduct pleaserefertoalsouser’smanual.

19 LCDViewSonicVX1940W-2
-4
ViewSonicCorporation
1.MonitorSpecifications
1.1specifications VSA VSAP VSE VSCN
Region (M) P(E)/(U) (G)
ProductName VX1940w-2
ModelNumber VS11868
OSDLanguages English,French,German,Italian,Spanish,Finnish,
Russian,Korean, Japanese,TraditionalChinese,
SimplifiedChinese
TFT LCD PanelandModel# CMOA190Z1L01
Scalar Model#: NT68670HTFG
InputSignal D-Sub /DVI-D
SyncCompatibility Separate/ Composite/ SOG
PowerConsumption Built-in/under49W(max)/ 44W(typ)
PowerCable RefertoAppendixG
Analog Cable(1.8m,color:black),withPC
2001and HotPlug Detect &DDC YES
DVI-DCable/ 1.8m YES
ViewSonicCD Wizard
ViewSonic Quick StartGuide
Arabic,English,Finnish, Spanish,German,
Italian, Japanese,Swedish,Polish,Korean
Portuguese,Russian,French,Greek,Dutch,Turkish,
SimplifiedChinese,TraditionalChinese,Czech, Hungarian
ScreenProtectorMylar YES
ExtrmeLabel (up to 2ms) Yes
ServiceInsert(newversion) YES NO NO NO
WarrantySticker NO NO NO YES
WarrantyCard(newversion) NO NO NO YES
CartonSticker(newversion) NO NO NO YES
PEbag ofCarton NO NO NO YES
1.2General specification
TestResolution&Frequency 1680x1050@60Hz
TestImageSize FullSize
Contrast andBrightnessControls FactoryDefault:
Contrast=70%, Brightness=100%
1.3Videointerface
Analog Input Connector DB-15(Analog),refertheappendixA
DigitalInputConnector DVI-D
Default Input Connector Defaultstothefirst detectedinput
VideoCableStrainRelief Equaltotwicetheweightofthemonitorforfiveminutes
VideoCableConnectorDB-15Pin
out CompliantDDC/CI/ DDC2B
VideoSignals 1. VideoRGB(Analog)

19 LCDViewSonicVX1940W-2
-5
ViewSonicCorporation
Separate, Composite,and SynconGreen
2.TMDS(Digital)
VideoImpedance 75Ohms(Analog), 100Ohms(Digital)
MaximumPCVideo Signal 950 mVwithnodamage tomonitor
MaximumMacVideoSignal 1250mVwithno damagetomonitor
SyncSignals TTL
DDC2B CompliantwithRevision 1.3
DDC/CI CompliantwithRevision 1.1
HDCP HDCPcodeinside andcompatible
SyncCompatibility SeparateSync, CompositeSync,SOG
VideoCompatibility Shall becompatiblewithallPCtypecomputers,Macintosh
computers, andaftermarketvideo cards
640x350 640x400 640x480 720x400
720x480 800x600 832x624 1024x768
1152x864 1152x870 1280x720 1280x768
1280x960 1280x1024 1360x768 1400x1050
1440x900 1600x1200 1680x1050
ResolutionCompatibility
The image verticalsizemightnot befull screen.
But the imageverticalposition shouldbe atthecenter.
Exclusions Notcompatiblewithinterlacedvideo
1.4TFT LCD panel
PanelSourceIdentify
Thepanelcode(refertosegment4-16)shouldbeshownonfollowingposition,
(1)Thelowerright side of IDlabel. (see Figure2)
(2)Thelowerrightside ofUPClabel.(see Figure3)
(3)TheF/Wversion stickerorsilkscreenon mainboard.
PanelCharacteristics :
1
st SourcePanel
Modelnumber CMOA190Z1L01
Type TNTYPEWITHLVDSINTERFACE
ActiveSize19 WIDE;408.24(H) X255.15(V)
PixelArrangement RGBVERTICALSTRIPE
PixelPitch 0.243(H) X0.243(H)MM
GlassTreatment ANTIGLARE(HARDCOATING3H)
#ofBacklights 4CCFL
BacklightLife 40000 HOURS (MIN)
Luminance(5-point)
Condition:
CT= User Color,
Contrast=Max,
Brightness= Max
300CD/M2(TYPAFTER30MINUTEWARM
UP)
230CD/M2(MINAFTER30 MINUTEWARM
UP)
BrightnessUniformity 67%(MIN)
ContrastRatio 1000:1(TYP), 630:1(MIN)
ColorDepth 16.2MILLIONCOLORS

19 LCDViewSonicVX1940W-2
-6
ViewSonicCorporation
ViewingAngle(Horizontal)
Ultra TN type
@CR>10
Typical:170
Minimum:150
ViewingAngle(Vertical)
Ultra TN type
@CR>10
Typical:160
MINIMUM:140
ResponseTime
10%-90%@Ta=25°C
Typical=5ms(on/off)
Maximum=15ms(on/off)
PanelDefects PleaseseePanelQualitySpecifications.

19 LCDViewSonicVX1940W-2
-7
ViewSonicCorporation
1.5Imageperformance
DisplaySize
HorizontalDisplaySize, PrimaryPreset Full Screen
VerticalDisplaySize,PrimaryPreset Full Screen
Luminance
Item Condition JUDGMENT
Lv(Max)Contrast=100%
Brightness=100%
CCT =User color(R/G/B=100%)
LV(MAX)=THE LUMINANCEIN
SECTION
4-7 “TFTLCDPANEL
Lv(Def)Contrast=100%
Brightness=100%
CCT =6500K [LV(DEF) /LV(MAX) ] X100% 65%
Lv(6500k) Contrast=Default Brightness=Default
ColorTemperature=6500K [LV(6500K)/LV(MAX) ] X100% 85%
Lv(9300k) Contrast=Default
Brightness=Default
ColorTemperature=9300K [LV(9300K)/LV(MAX) ] X100% 65%
Lv(7500k) Contrast=Default
Brightness=Default
ColorTemperature=7500K [LV(7500K)/LV(MAX) ] X100% 75%
Lv(5400k)Contrast=Default Brightness=Default
ColorTemperature=5400K[LV(5400K)/LV(MAX) ] X100% 70%
Lv(Brightness)
Contrast=100% [LV(BRIGHTNESS=0%)/ LV(BRIGHTNESS=100%)]X
100% ≤55%
Lv(Contrast) Brightness=100% [Lv(Contrast=0%)/Lv(Contrast=100%)]x
100% ≤30%

19 LCDViewSonicVX1940W-2
-8
ViewSonicCorporation
ContrastRatio
Contrast=Default
Brightness=Default
TestPattern= 64-Gray NO VISIBLE SATURATION
Contrast=100%
Brightness=100%
TestPattern=64-Gray 12-16 LEVELSATURATION
DynamicContrastRatio
CR(Max) Condition:
CCT=USERCOLOR
(R/G/B=100%)
3000:1(typ)
DCRSelection inOSDMenu Display “Dynamic Contrast”textwith “On/Off”
selection.
DCRDefaultSetting Off
DCROnDefinition Full timeframeluminancedetectionfor: 1.BacklightAdjustment
2.AdaptiveContrastAdjustment

19 LCDViewSonicVX1940W-2
-9
ViewSonicCorporation
BacklightAdjustment Method
DCR willcalculatethegraylevelhistogramin aframe
andsetbacklightbrightnesstargetasbelow:
λ Theadjustment timetomeetbrightnesstargetis
3±0.5seconds.
λ Imageflickerorflashingis prohibitedforvideo
displayand/orPCmode operation.
GrayLevel
(FrameAverage)
Backlight
Brightness
(%)
0~7 0
8~15 30
16~23 52
24~31 68
32~39 78
40~47 86
48~55 91
56~63 96
64and above 100
BacklightBrightness
25
GrayLevel
30%
0%
16
0
8
24
64
56
48
40
32
52%
68%
78%
86%
91%
96%
100%

19 LCDViewSonicVX1940W-2
-10
ViewSonicCorporation
AdaptiveContrastAdjustment
Toadjust Gammadatafordifferentframeluminance
λ Thecontrast/datadeltapercentageisless than
10%of originalvalue.
λ Lowlevelnoisecannotoccurduringadaptive
contrast adjustment.
λ Thedynamic changeinGammadatacan not
causeflashingduringgrayleveltransition (L0 to
L255)
ContrastCurveReference
DarkSceneBrightScene
(Actualcurvemayvarydependsonperformance)
ColorandSharpness tuning (Optional)
λ Toimproveimagecontrast,the saturationand
peakingcanbeincreased upto5%.
λ Beawareofside effectslikecolordistortionand
64 192
255
128
64
192
255
128
Yin

19 LCDViewSonicVX1940W-2
-11
ViewSonicCorporation
datanoise.
OSDControlLimitation(DCR on)
1.DisableContrast/Brightnessmenuandhotkey
control.CR/BTusersettingsarestored forlater
retrieval.
2.Brightness levelisbasedonDCR calculationand
independentfromOSDsetting.
3.DisableWhiteBalancehot key.
4.Disable “sRGB”selectioninColorAdjustmenu
OSDControlLimitation(DCR off) 1.RestoreBR/CTsettingswhen DCR is off
2.DisableDCRwhen “sRGB”isselected inColor
Adjustmenu.
DDC/CI Control(forCR / BTonly) DisableContrast/Brightnesscontrol.
Remark Compatibletoall listedtiming settings.
Saturation
Contrast=Default
Brightness=Default
TestPattern= 64-Gray NO VISIBLE SATURATION
Contrast=100%
Brightness=100%
TestPattern=64-Gray 12-16 LEVELSATURATION
PresetColorTemperatures
sRGB It shouldmeetIEC61966-2-1(1999-10)standard.
Preset1 CCT(typ)=9300K (x=0.283 0.03；y=0.297 0.03)
(@FullWhitepattern)
Preset2 CCT(typ)= 7500K (x=0.299 0.03；y=0.315 0.03)
(@FullWhitepattern)
Preset3(Primary) CCT(typ)= 6500K (x=0.313 0.03；y=0.329 0.03)
(@FullWhitepattern)
Preset4 CCT(typ)= 5400K (x=0.335 0.03；y=0.350 0.03)
(@FullWhitepattern)
PresetColorTemperature
Adjustability Eachcolor
presetshallbe adjustable.Red,Green,and Blue
shallbeindividuallycontrolled.
Grayscales mustbe linear with nobanding ….And grayscalesmustbe “gray withnored,
green,orbluishdistortion
VideoCardsCompatibility
PeakingPerformance: Peakingisnotadjustable
RasterArtifacts
●VideoArtifacts: Novisiblestreaking,sag, orsmearingartifactswhen drivenbythespecified
videocardsintheprimarymode andafteruseradjustmenttobestcondition

19 LCDViewSonicVX1940W-2
-12
ViewSonicCorporation
●PowerSupply, and GroundingArtifacts: Novisibleartifactsinanyspecified videomodewithin
thehorizontalorverticalfrequency rangeof the monitor
●TemperatureDrift : Imageshallnotdrift orlosefine-tune adjustment
1.6Videocommunications
EDID StandardAnd Structure
EDID FileFormat VESA’sEDID StandardVersion #3,Revision#0,
EDIDStructureVersion#1,Revision#3.
EDID VENDORNAME VSC: Byte8 0x5A,Byte9 0x63.
EDID PRODUCTID Byte10
20 ,Byte11 6A
EDID File Shallbe approved byVSCpriortoMP.
1.7Codingassignment
ProductName ViewSonic VX1940w-2
Modelnumber VS11868
S/N Coding IDLabelandSmall
S/N Sticker(Code ‘128’format)
PPPYYWWAxxxxwhere
PPP =RegionalProductID Code
YY=Last2digitsofmanufacturing year
WW =Manufacturingweek
A=2~4forCMOA190Z1L01withNT68670HTFG(Ningbo/ TPV)
A=5~6forCMOA190Z1L01withNT68670HTFG(Ningbo/CMO)
A=0~1and 7~9Reserved
xxxx=Sequencenumber
RegionalProductID Code ID Code:
R60
GTIN (UCC-12)
Code:UPC-A UPC-ACode:
766907 27531 5
Note:ForUPClabel,pleaserefertoFigure3
GTIN (EAN/UCC-14)
Code:ITF-14 ITF-14Code:
00766907 275315
Note:ForUPClabel,pleaserefertoFigure3
FCC ID SelfCertification

19 LCDViewSonicVX1940W-2
-13
ViewSonicCorporation
2.LCD MONITORDESCRIPTION
3.Frontpanelfunctioncontrol description
3.1Front PanelHardwareControls
PowerSwitch(FrontHead) PowerControl,softPowerSwitch.
PowerLED (FrontHead) Blue ON Amber ActiveOff
Dark=SoftPowerSwitchOFF
FrontPanelControls(Head)
[ 1][ 2]] [ ][▼][▲]
[ 1] BUTTON 1
[ 2]Button2
[]Power
[▼]DOWNARROWBUTTON
[▲]UPARROWBUTTON
Note:PowerButton, Button 1andButton2mustbe
one-shotlogicoperation.(i.e.thereshouldbeno
cycling)

19 LCDViewSonicVX1940W-2
-14
ViewSonicCorporation
Reaction Time OSDmustfully appearwithin0.5safterpushing
Button 1
ShortCutsFunctionfromthebutton(s)
[1] MainMenu
[2] Inputtoggle(D-sub /DVI)
[▼]or[▲] ToimmediatelyactivateCRorBTmenu.
[▼]+[ ▲] Recall bothofCRandBTtodefault
[1]+[2]
1.Toggle1400x1050and1680x1050 mode wheninput
1400x1050 or1680x1050mode.
2.Toggle640x400and720x400modewheninput640x400 or
720x400modes.
[1] +[▼] +[▲]
(Keeppushing3sec) WhiteBalance. (Notshownonuser’sguide)
[1]+[▼] PowerLock
[1]+[▲] OSDLock
[2]+[▼] DDC/CI switch ◊on=DDC/CI ; off=DDC2B
[1]+[2]+[ ] FactoryMode
Remark:All theshortcutsfunction areonlyavailablewhileOSDoff
3.2Functiondescriptions
OSD Lockshortcutsfunction forthebuttons
TheOSDlock willbeactivatedbypressingthefrontpanelcontrolbuttons"(1),&
(▲)"for 10seconds.
Iftheuser thentriestoaccess theOSDbypressing anyofthebuttons"1", "▼","▲",
"2"amessage will appear onthe screen for3secondsshowing "OSDLocked".
TheOSDlock willbedeactivatedbypressing thefront panelcontrolbuttons"(1),&
(▲)"againfor 10 seconds.
Note1: WhentheOSD islockedwill lockall functions,including “Volume”and “Mute”
Note2:StatusbarindicatingOSDLockor Unlock isinprogressand whencompleteitwill
indicate “OSD Locked”
Note3:OSD Lockshouldnotlock PowerButton and PowerLockfunction
PowerLock shortcutsfunction forthebuttons
The powerbuttonlockwill be activated bypressing thefront panelcontrolbuttons"(1),&(▼)"for
10seconds.
Lockingthe powerbutton meansthatthe userwon'tbeabletoturnofftheLCD whilethe power
buttonislocked.Iftheuserpressesthepowerbuttonwhileitislocked,amessagewill appearonthe
screenfor3secondsshowing"PowerButtonLocked".It alsomeansthatwiththepowerbutton
locked,the LCDwouldautomaticallyturnback"On"whenpoweris restoredafterapowerfailure. If
the powerbuttonisnotinthe lockedmode,then powershouldreturntoit'spreviousstatewhen
powerisrestoredafterapowerfailure.
The powerbuttonlockwill bedeactivatedbypressingthefront panelcontrolbuttons"(1),&(▼)"
againfor10seconds.
Note1:Statusbarindicating PowerButton lockorunlockisinprogress andwhencompleteitwill
indicate “PowerButton Locked”

19 LCDViewSonicVX1940W-2
-15
ViewSonicCorporation
Note2:Powershouldonlybelockableinthe “OnState”
MemoryRecall Actions
MemoryRecallactionon the analogand digitalmodeasbelow
1. Set the factorydefaultsasshowninSection4-8
2. Cleanallthemode setting buffer
3. ExecuteAutoImageAdjust
Note: MemoryRecallshouldhavenoeffectforLanguage, PowerLock,UserColorSettingsorInput
Priority
ResolutionNoticeActions
1.Resolution NoticeOSDshouldshowon screenafterchangingtonon-nativemodefor30sec
2.The OSDshoulddisappearafter10secorbypushing button[1]or[2]
Resolution Noticefunctionshouldbe disabledwhenpushbutton[2] underResolution NoticeOSD
0-Touch™FunctionActions
1.ExecuteAuto ImageAdjustwhennewmodedetected,andsavethesettingstobufferforfurther
use
2. It shouldberesetbyMemoryRecallfunction
(Shouldnot reset bypoweroff, powerunplugandothers)
OSDAutoSave
The OSDshall savenewsettingswhenitisturnedoff bytheuserorwhenit timesout.Thereshall
not beaseparatesave
Input Priority
Thisfunctionis definedthe autodetect prioritywhen thedisplayhasseveralinputs. Pleasereferto
the detailflowchart asthe appendixD
*1. Tolerance ≧±2KHz.(if the range dosenotcoverothertimingmode)
*2.Anytimingnotinthelist,itshoulddisplayasnormalorshowon “OUTOFRANGE”OSDmessage
withblanking.
*3. Theimagequalityof85Hzmode might beworsethan75Hz.
PrimaryPresets
1680x1050@60Hz
UserPresets
Numberof UserPresets(recognized timings)Available:10 presetstotalinFIFOconfiguration
Changing Modes
●MaximumModeChangeBlankTimeforimagestability: 3seconds(Max),excluding “Auto
ImageAdjust”time
●UnderDOSmode (640x350, 720x400&640x400),itshouldrecallfactorysettingwhen
execute “AutoImageAdjust”
●Themonitorneedstodo “AutoAdjust”thefirst timewhen anewmodeisdetected
(Seesection “0-Touch™FunctionActions”)

19 LCDViewSonicVX1940W-2
-16
ViewSonicCorporation
4.Input/outputspecification
4.1D-SUBconnector pinassignment
PinNumber PinFunction
1 Redvideo input
2 Green video input
3 Bluevideo input
4 NoConnection
5 Ground
6 Redvideo ground
7 Green video ground
8 Bluevideo ground
9 +5V
10 H/Vsyncground
11 Noconnection
12 (SDA)
13 Horizontalsync(Compositesync)
14 Verticalsync
15 (SCL)
D-SUB15PINconnector
1 5
610
11 15
DVI-D connectorpinassignment
PinNumber PinFunction
1 DATA2-
2 DATA2+
3 DATA2/4Shield
4 DATA4-
5 DATA4+
6 DDC Clock
7 DDC Data
8 NoConnect
9 DATA1-
10 DATA1+
11 DATA1/3Shield
12 DATA3-
13 DATA3+
14 +5V

19 LCDViewSonicVX1940W-2
-17
ViewSonicCorporation
15 GND for+5V
16 HOTPLUGDETECT
17 DATA0-
18 DATA0+
19 DATA0/5Shield
20 DATA5-
21 DATA5+
22 Clock Shield
23 Clock+
24 Clock-
4.2FactoryPresetDisplay Modes
Timingtable
Analog
Item
Timing
Separate
Composite
SOG
Digital - TMDS
Remark
1 640x350 @
70
Hz,
32
kHz
V
V
V
V
2 640x400 @
60
Hz,
32
kHz
V
V
V
V
3 640x400 @
70
Hz,
32
kHz
V
V
V
V
5 640x480 @
50
Hz,
25
kHz
V
V
V
X
The pixelclock islowerthanDVIstandard.
6 640x480 @
60
Hz,
32
kHz
V
V
V
V
7 640x480 @
67
Hz,
35
kHz
V
V
V
V
8 640x480 @
72
Hz
38
kHz
V
V
V
V
9 640x480 @
75
Hz,
38
kHz
V
V
V
V
11 720x400 @
70
Hz,
32
kHz
V
V
V
V
13 720x480 @
60
Hz,
29.8
kHz
V
V
V
V
14 720x576 @
50
Hz,
31.3
kHz
V
V
V
V
15 800x600 @
56
Hz,
35.1
kHz
V
V
V
V
16 800x600 @
60
Hz,
38
kHz
V
V
V
V
17 800x600 @
72
Hz,
48
kHz
V
V
V
V
18 800x600 @
75
Hz,
47
kHz
V
V
V
V
20 832x624 @
75
Hz,
50
kHz
V
V
V
V
21 1024x768 @
50
Hz,
40
kHz
V
V
V
V
22 1024x768 @
60
Hz,
48
kHz
V
V
V
V
23 1024x768 @
70
Hz,
57
kHz
V
V
V
V
24 1024x768 @
72
Hz,
58.1
KHz
V
V
V
V
25 1024x768 @
75
Hz,
60
KHz
V
V
V
V
26 1024x768 @
75
Hz,
60.2
KHz
V
V
V
V
28 1152x864 @
75
Hz,
68
KHz
V
V
V
V
29 1152x870 @
75
Hz,
69
KHz
V
V
V
V
31 1280x720 @
50
Hz,
37
KHz
V
X
X
V
32 1280x720 @
60
Hz,
45
KHz
V
V
V
V
33 1280x768 @
50
Hz,
40
KHz
V
V
V
V
34 1280x768 @
60
Hz,
47.8
KHz
V
V
V
V

19 LCDViewSonicVX1940W-2
-18
ViewSonicCorporation
35 1280x768 @
75
Hz,
60
KHz
V
V
V
V
37 1280x960 @
50
Hz,
49
KHz
V
V
V
V
38 1280x960 @
60
Hz,
60
KHz
V
V
V
V
39 1280x960 @
75
Hz,
75
KHz
V
V
V
V
40 1280x1024
@
50
Hz,
53
KHz
V
V
V
V
41 1280x1024
@
60
Hz,
64
KHz
V
V
V
V
42 1280x1024
@
75
Hz,
80
KHz
V
V
V
V
43 1360x768 @
60
Hz,
48
kHz
V
V
V
V
44 1400x1050
@
50
Hz,
54
kHz
V
V
V
V
45 1400x1050
@
60
Hz,
65.3
kHz
V
V
X
V
Foranalogsync,
Switch1400 x1050@60Hzand1680x
1050@60Hzby[1]+[2]shortcut key
(primary=1680x1050@60Hz)
Autoimageshouldbeexecutedwhen
Switch
1400 x1050@60Hzand1680x1050@60Hz
by[1]+[2] shortcutkey
46 1440x900 @
60
Hz,
55.9
kHz
V
V
V
V
47 1440x900 @
75
Hz,
70.6
kHz
V
V
V
V
48 1600x1200
@
60
Hz,
75
kHz
V
V
V
V
49 1680x1050
@
60
Hz,
65.3
kHz
V
V
X
V
4.3Factorydefaults
Item Defaults Item Defaults
Contrast 70% OSDTimeOut 15Sec
Brightness 100% OSDBackground On
ColorTemperature 6500K Volume N/A
Sharpness 100% Treble N/A
OSD H. Position 50% Bass N/A
OSDV. Position 50% InputPriority AutoSearch
720x400/640x400 720x400 Dynamiccontrast Off
Resolution Notice On Aspect Ratio Fullscreen
ResponseTime 50

19 LCDViewSonicVX1940W-2
-19
ViewSonicCorporation
5. Schematicdiagrams
5.1Mainboard
TOP
+5V
MUTE AMP_SHDN VOL_PWM
SPK_R+
SPK_R-
SPK_L+
SPK_L-
RX2-
B3
03_SCALER
B_D[0..19] F_D[0..19]
BSTHI FSTHI
OE
POL STV
GVON
STB
CKV
INV_ON/OFF
INV_ADJ
PANEL_ON VCM_PWM
VGA_SCL
VGA_SDA
VSIN
HSIN SOGI
BI1-
BI1
GI1-
GI1 RI1
RI1-
LED_ORG LED_GRN
MENU
PWR_SW
MUTE
AMP_SHDN
VOL_PWM
DVDD
VGA_3V3
MCU_VDD
ADC_VAA
RX2- RX2+ RX1- RX1+ RX0- RX0+ RXC- RXC+ DVI_HPD DVI_SCL DVI_SDA
SOURCE_SELECT
KEY_UP
KEY_DOWN
AUTO_ADJ
V33S
CVDD1V8
B4
04_INTERFACE
INV_ADJ INV_ON/OFF MENU PWR_SW LED_ORG LED_GRN STV CKV OE STB POL FSTHI F_D[0..19] B_D[0..19] PANEL_ON VCM_PWM GVON BSTHI
SPK_R-
SPK_R+
SPK_L+
SPK_L-
+5V
DVDD VGA_3V3
ADC_VAA
MCU_VDD
LIPS_5V
KEY_UP KEY_DOWN AUTO_ADJ SOURCE_SELECT V33S CVDD1V8
B1
02_VGA
RI1 RI1- SOGI GI1- BI1 BI1- GI1 HSIN VSIN VGA_SDA VGA_SCL
+5V
ADC_VAA
RX2+
INV_ON/OFF INV_ADJ PWR_SW MENU LED_GRN LED_ORG STB POL STV OE CKV
RX1-
VCM_PWM GVON FSTHI PANEL_ON
F_D[0..19] B_D[0..19]
BSTHI
RX1+
BI1 RI1 GI1 RI1- BI1- HSIN VSIN MCU_VDD VGA_SDA
RX0-
SOGI
RX0+ RXC- RXC+ DVI_SCL DVI_SDA DVI_HPD
CVDD1V8 KEY_UP DVDD
ADC_VAA
KEY_DOWN VGA_3V3 AUTO_ADJ SOURCE_SELECT
LIPS_5V
VGA_SCL
B5
05_AUDIO
MUTE AMP_SHDN VOL_PWM
SPK_L-
SPK_L+
SPK_R-
SPK_R+
LIPS_5V
GI1-
B6
06_DVI
RX2-
RX2+
RX1-
RX1+
RX0-
RX0+ RXC-
RXC+
DVI_HPD
DVI_SCL
DVI_SDA
ADC_VAA
+5V
CVDD1V8
V33S

19 LCDViewSonicVX1940W-2
-20
ViewSonicCorporation
VGA
+5V 4,5
CA1
0402/1n/16V/7
C3
0402/100n/16V/Y
C10
NC/0402/100n/16V/Y
C7
NC/0402/100n/16V/Y
C4
NC/0402/100n/16V/Y
ADC_VAA
R3
0402/75R/1%
R8
0402/75R/1%
R11
0402/75R/1%
R14
0402/2.2K/5%
R1 0402/56R/1%
R17
0402/2.2K/5%
R6 0402/56R/1%
R10 0402/56R/1%
R7
NC/0402/1M/1%
R2 0402/3.9K/5%
B1
BK1608HS330
1 2
C12
0402/100p/50V/N
R15 0402/100R/5%
B2
BK1608HS330
1 2
R16 0402/100R/5%
C13 0402/22p/50V/N
B3
BK1608HS330
1 2
R12 0402/100R/1%
R9 0402/100R/1%
R4 0402/100R/1%
R18
0402/4.7K/5% R19
0402/4.7K/5%
R13 NC/0402/0R/5%
100M/33ohm
C11
NC/0603/10u/6.3V/5/B
VSCL
TP
1
R5 0402/470R/1%
VSDA
TP
1
VGA_SCL
VGA_SDA
Z1
NC/UDZSF-5.6B/RoHS
1 2
BAI+
GAI+
GND_POWER
CN1
MLX89263-6762/RoHS
1
6
2
7
3
8
4
9
5
11
12
13
14
15 10
RAI-
VGA_SDA
VSI
HSI BAI-
GAI-
VGA_SCL
GND_POWER
GND_POWER
RAI+
VGA_5V
C1 0402/47n/16V/Y
VGA_SDA
VGA_SCL
VGA_5V
D1
BAV70W/RoHS
1 2
3
C2 0402/47n/16V/Y
U1
AT24C02B-10TU-1.8/RoHS
NC
1
NC
2
NC
3GND
4SDA 5
SCL 6
WP 7
VCC 8
VSI
+5V
GND_POWER
GND_POWER
VGA_VDD
VGA_5V
VGA_VDD VGA_VDD
GI1- 3
SOGI 3
RI1- 3
RI1 3
GI1 3
BI1- 3
BI1 3
GND_POWER
Z2
NC/UDZSF-1.9V
1 2
GND_POWER
C5 0402/47n/16V/Y
GND_POWER
SOGI
D2
NC/BAV99/RoHS
1
32
RAI+
RAI-
GND_POWER
RI1-
RI1
D3
NC/BAV99/RoHS
1
32
GAI+
C6 0402/47n/16V/Y
GI1
GI1-GAI-
D4
NC/BAV99/RoHS
1
32
BI1BAI+
BI1-BAI-
GND_POWER
GND_POWER
HSI
C8 0402/47n/16V/Y
GND_POWER
HSIN 3
Z4
NC/UDZSF-5.6B/RoHS
1 2
GND_POWER
VSIN 3
GND_POWER GND_POWER
GND_POWER GND_POWER
Z3
NC/UDZSF-5.6B/RoHS
1 2
C9 0402/47n/16V/Y
VGA_SDA3
GND_POWERGND_POWER
VGA_SCL3
Z6
NC/UDZSF-5.6B/RoHS
1 2
Z5
NC/UDZSF-5.6B/RoHS
1 2
VGA_SDAVGA_SCL
ADC_VAA3,4,5