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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Todetermineifthecomputer’skeyboardisfunctioningproperly,performthefollowing
procedures.Figure2-5outlinestheprocess.StartwithProcedure1andcontinuewiththe
otherproceduresasinstructed.
Procedure1: Externalkeyboardcheck
Procedure2: Diagnosticcheck
Procedure3: Connectorandreplacementcheck
Procedure1 Externalkeyboardcheck
ConnectaUSBkeyboardtooneofthecomputer’sUSBports,andthenbootthecomputer.
Thecomputerautomaticallydetectstheexternalkeyboard.
Iftheexternalkeyboardworkscorrectly,theinternalkeyboardoritsconnectionsmaybe
faulty.GotoProcedure2.
Iftheexternalkeyboardappearstohavethesameproblemastheinternalkeyboard,the
systemboardmaybehavingsomeproblem.Replaceitwithanewoneandfollowingthe
instructionsinChapter4.
Procedure2 Diagnosticcheck
Runthe
testandDiagnostics
Program,whichwillautomaticallyexecutetheKeyboardTest.
RefertoChapter3,
TestsandDiagnostics
formoreinformationonhowtoruntheprogram.
Ifanerrorislocated,gotoProcedure3.Ifanerrordoesnotoccur,thekeyboardis
functioningok.
Procedure3 Connectorandreplacementcheck
Thekeyboardand/orsystemboardmaybedisconnectedordamaged.Disassemblethe
computerfollowingthestepsdescribedinChapter4,ReplacementProceduresandperform
thefollowingchecks.
Check1 Makesurethekeyboardcableisfirmlyconnectedtothesystemboard.
Iftheconnectionisloose,reconnectfirmlyandrepeatProcedure2.Ifthereisstill
anerror,gotoCheck2.
Check2 Thekeyboardmaybedamaged.Replaceitwithanewonefollowingthe
instructionsinChapter4.
Iftheproblemstillexists,performCheck3.
Check3 Thesystemboardmaybedamaged.Replaceitwithanewonefollowingthe
instructionsinChapter4.
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