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externalUSBdevicesarefunctioningproperly,performthe
followingprocedures.Figure2-6outlinestheprocess.StartwithProcedure1andcontinueas
instructed.
Procedure1: Externaldeviceandconnectioncheck
Procedure2: Replacesystemboard
Procedure1 Externaldeviceandconnectioncheck
TheUSBdevicemaybedamagedortheconnectionmaybefaulty.PerformCheck1.
Check1 MakesureUSBdevicecableisfirmlypluggedintooneoftheUSBsockets.Ifthe
cableisconnectedcorrectly,gotoCheck2.
Check2 PlugtheUSBdeviceintoanotherUSBsocket(therearethreeinall).IftheUSB
devicestilldoesnotwork,gotoCheck4.
IfthedevicefunctionscorrectlywhenconnectedtoanotherUSBport,goto
Check3.
Check3 MakesurethattheUSBsocketisfirmlysecuredtothesystemboardofthe
computer.Ifthemalfunctionremains,thesystemboardorUSBsmallboardmay
bedamaged.GotoProcedure2.
Check4 ConnectanalternativeUSBdevicetooneofthecomputer’sUSBports,andthen
bootthecomputer.Thecomputerautomaticallydetectstheexternaldevice.
IfthealternativeUSBdeviceworkscorrectly,theoriginaldevicemaybe
damagedandshouldbereplaced.
IfthealternativeUSBdeviceappearstohavethesameproblemastheoriginal
device,thesystemboardorUSBsmallboardmaybedamaged.GotoProcedure
2.
Procedure2 Replacesystemboard
Iftheerrorpersists,thesystemboardorUSBsmallboardmaybedamaged.Replaceitwitha
newonefollowingtheinstructionsinChapter4.
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