Toshiba Satellite L300 - 2.7 Display

2Troubleshooting 2.7Display
2-16 SatelliteL300D/L305D/SatelliteProL300D/EQUIUML300D/SATEGOL300DMaintenanceManual
2.7 Display
Tocheckifthecomputer’sdisplayisdefectiveormalfunctioning,followthetroubleshooting
proceduresbelowasinstructed.
Procedure1ExternalMonitorCheck
Procedure2TestProgramCheck
Procedure3ConnectorCheckandReplacementCheck
Procedure1ExternalMonitorCheck
Connectanexternalmonitortothecomputer'sexternalmonitorport,thenbootthecomputer.
Thecomputerautomaticallydetectstheexternalmonitorevenifresumemodeisenabled.
Iftheexternalmonitorworkscorrectly,theinternalLCD,LCD/FLcable,orFLmaybefaulty.
GotoProcedure3.
Iftheexternalmonitorappearstohavethesameproblemastheinternalmonitor,thesystem
boardmaybefaulty.GotoProcedure2.
Procedure2TestProgramCheck
InsertthediagnosticsbootableCDinthecomputer'sCDROM,turnonthecomputerandrun
thetest.SeeChapter3forinformationonhowtoperformthetest.
Ifanerrorisdetectedinthetest,gotoProcedure3.Ifnoerrorisdetected,thedisplayitself
isnormal.

Procedure3ConnectorCheckandReplacementCheck
ThedisplayunithasanLCDmodule,Fluorescentlamp(FL),panelcloseswitchandFL
inverterboard.Anyofthecomponentsortheirconnectionsmaybedefective.Disassemble
thecomputerfollowingthestepsdescribedinChapter4,thenperformthefollowingchecks:
(1) IftheFLdoesnotlight,performCheck1.
(2) Ifcharactersorgraphicsarenotdisplayednormally,performCheck5.
(3) IftheFLremainslitwhenthedisplayisclosed,thepanelcloseswitchmaybe
defective.PerformCheck8.

Check1 Makesurethefollowingcableshavebeenfirmlyconnectedtothesystem
boardandFLinverterboard.
FL
FLinverterboard
Systemboard
CPU
HVcable LCD/FLcable


 Ifanyofthecablesislooseoroff,reconnectitfirmlyandreturnto
Procedure3.Ifthereisstillanerror,performCheck2.
Check2 TheLCD/FLcablemaybefaulty.Replaceitwithanewoneandreturnto
Procedure3.Ifthereisstillanerror,performCheck3.
Check3 TheFLmaybefaulty.ReplaceitwithanewoneandreturntoProcedure