Lenovo System x3650 M4 HD - Page 170

Powerproblemscanbedifficulttosolve.Forexample,ashortcircuitcanexistanywhereonanyofthe
powerdistributionbuses.Usually,ashortcircuitwillcausethepowersubsystemtoshutdownbecauseof
anovercurrentcondition.Todiagnoseapowerproblem,usethefollowinggeneralprocedure:
Step1.Turnofftheserveranddisconnectallpowercords.
Step2.Checkforloosecablesinthepowersubsystem.Alsocheckforshortcircuits,forexample,ifa
loosescrewiscausingashortcircuitonacircuitboard.
Step3.CheckthelitLEDsontheoperatorinformationpanel(see“Lightpathdiagnostics”onpage129).
Step4.IfthechecklogLEDonthelightpathdiagnosticspanelislit,checktheIMMeventlogforfaulty
Pwrrailandcompletethefollowingsteps.Table15“Componentsassociatedwithpowerrail
errors”onpage158
identifiesthecomponentsthatareassociatedwitheachPwrrailandthe
orderinwhichtotroubleshootthecomponents.
a.Disconnectthecablesandpowercordstoallinternalandexternaldevices(see“Internalcable
routingandconnectors”onpage179).Leavethepower-supplycordsconnected.
b.ForPwrrailAerror,completethefollowingsteps:
1.(Trainedtechnicianonly)Replacethesystemboard.
2.(Trainedtechnicianonly)Replacethemicroprocessor.
c.Forotherrailerrors(PwrrailAerror,seestepb),removeeachcomponentthatisassociated
withthefaultyPwrrail,oneatatime,inthesequenceindicatedinTable15“Components
associatedwithpowerrailerrors”onpage158,restartingtheservereachtime,untilthe
causeoftheovercurrentconditionisidentified.
Table15.Componentsassociatedwithpowerrailerrors
PwrrailerrorintheIMMeventlogComponents
PwrrailAerror•Microprocessor1
PwrrailBerror•Microprocessor2
PwrrailCerror•Adapter(ifoneisinstalled)inPCIriser-cardassembly1
orHDD/ServerRAID-H1110(iftheyarepresent)installed
inthereartwohard-disk-drivekit
•PCIriser-cardassembly1orreartwohard-disk-drivekit
•Fan1
•DIMMs1through6
PwrrailDerror•Dual-portnetworkadapter
•Fan2
•DIMMs7through12
PwrrailEerror•Harddiskdrives
•DIMMs13through18
PwrrailFerror
•Adapter(ifoneisinstalled)inPCIriser-cardassembly1
orHDD/ServerRAID-H1110(iftheyarepresent)installed
inthereartwohard-disk-drivekit
•PCIriser-cardassembly1orreartwohard-disk-drivekit
•Fan4
•DIMMs19through24
158LenovoSystemx3650M4HDInstallationandServiceGuide