NCR 7454 - LCD Backlight Inverter Module; Touch Screen

Chapter 1: Product Overview 1-23
LCD Backlight Inverter Module
AnInverterBoardsuppliespowerfortheLCDBacklight,whichisa
separatemoduleintheterminal.Theinverterhasaconnectorthat
receivespower,ground,andaBacklightdimmingsignalfromthe
ProcessorBoard.Theinvertergeneratesthehighvoltagenecessaryto
startandrundualCCFLBacklights.
Afuse
locatedontheInverterBoardprotectspowertotheinverter.
ThisfuseprotectsthesystemfromdamageintheeventofaBacklight
orInverterBoardfault.Thefuseisnotfieldreplaceable;ifitblows,the
safetycharacteristicsofoneormorecomponentsontheInverterBoard
mayhave
beencompromisedandtheInverterBoardshouldbe
replaced.
IfoneorbothBacklighttubesbecom e disconnectedorotherwiseopen‐
circuited,protectioncircuitryshutsdowntheinverter.Thisavoids
over‐poweringasingletubeandalsoprotectsagainsthighvoltage
shorting.
Touch Screen
TheTouchScreencompletelycoverstheLCDandismounteddirectly
infrontoftheLCD,behindthefrontplasticbezeloftheterminal.The
touchcontrollerontheProcessorBoardsupportscapacitiveand
resistivetouchglass.
Thetouchglasshasanintegratedharnessthatisroutedintothe
ProcessorBoard
enclosureandisconnectedtoaheaderonthe
ProcessorBoard.Thetouchglasshasaglare‐reducingtexturethatalso
helpshidefingerprints.