Toshiba PROL550 Laptop User Manual


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2TroubleshootingProcedures
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SatelliteL550/ProL550SeriesMaintenanceManual
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Thissectiondescribeshowtodetermineifthecomputer’sdisplayisfunctioningproperly.
TheprocessisoutlinedinFigure2-3.StartwithProcedure1andcontinuewiththeother
proceduresasinstructed.
Procedure1: Externaldisplaycheck
Procedure2: Diagnosticcheck
Procedure3: Connectorandreplacementcheck
Procedure1 Externaldisplaycheck
Connectanexternaldisplaytothecomputer’sexternalmonitorport,andthenbootthe
computer.Thecomputerautomaticallydetectstheexternaldisplay.
Iftheexternaldisplayworkscorrectly,theinternalLCDmaybedamaged.GotoProcedure3.
Iftheexternalmonitorappearstohavethesameproblemastheinternalmonitor,thesystem
boardmaybedamaged.GotoProcedure2.
Procedure2 Diagnosticcheck
TheDisplayTestprogramisstoredonthecomputer’sDiagnosticsdisk.Thisprogramchecks
thedisplaycontrolleronthesystemboard.InserttheDiagnosticsdiskinthecomputer’s
floppydiskdrive,turnonthecomputerandrunthetest.RefertoChapter3,Testsand
Diagnosticsfordetails.
Ifanerrorisdetected,gotoProcedure3.Ifanerrorisnotdetected,thedisplayisfunctioning
properly.
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