Lenovo ThinkPad E460 - No-Beep Symptoms; LCD-Related Symptoms; Intermittent Problems

No-beepsymptoms
Table5.No-beepsymptoms
Symptomorerror
FRUoraction,insequence
Nobeep,power-onindicatoron,LCDblank,andno
POST.
1.Ensurethateveryconnectorisconnectedtightly
andcorrectly.
2.Reseatmemorymodule.
3.Replacethesystemboard.
Nobeep,power-onindicatoron,andLCDblankduring
POST.
1.Reseatmemorymodule.
2.Replacethesystemboard.
Thepower-onpasswordpromptappears.Apower-onpasswordorasupervisorpasswordisset.
TypethepasswordandpressEnter.
Thehard-diskpasswordpromptappears.Aharddiskpasswordisset.Typethepasswordand
pressEnter.
LCD-relatedsymptoms
Important:TheTFTLCDforthenotebookcomputercontainsmanythin-filmtransistors(TFTs).The
presenceofasmallnumberofdotsthataremissing,discolored,oralwayslightedischaracteristicofTFT
LCDtechnology,butexcessivepixelproblemscancauseviewingconcerns.IftheLCDyouareservicinghas
twoorlessvisibledefectivepixels,itshouldnotbeconsideredfaulty.However,iftheLCDhasthreeormore
visibledefectivepixels,itwillbedeemedasdefectivebyLenovoanditshouldbereplaced.
Notes:
•ThispolicyappliestoallThinkPadnotebookspurchasedon1January,2008orlater.
•LenovowillnotprovidewarrantyreplacementiftheLCDiswithinspecificationsbecausewecannot
guaranteethatanyreplacementLCDwillhavezeropixeldefects.
•OnepixelconsistsofR,G,Bsub-pixels.
Table6.LCD-relatedsymptoms
S
ymptomorerror
FRUoraction,insequence
Nobeep,power-onindicatoron,andablankLCDduring
POST.
Replacethesystemboard.
•LCDbacklightnotworking.
•LCDtoodark.
•LCDbrightnesscannotbeadjusted.
•LCDcontrastcannotbeadjusted.
1.ReseattheLCDconnectors.
2.ReplacetheLCDassembly.
3.Replacethesystemboard.
•LCDscreenunreadable.
•Charactersmissingpixels.
•Screenabnormal.
•Wrongcolordisplayed.
1.Seeimportantnotefor“LCD-relatedsymptoms.”
2.ReseatallLCDconnectors.
3.ReplacetheLCDassembly.
4.Replacethesystemboard.
HorizontalorverticallinesdisplayedonLCD.ReplacetheLCDassembly.
Intermittentproblems
Intermittentsystemhangproblemscanbeduetoavarietyofcausesthathavenothingtodowithahardware
defect,suchascosmicradiation,electrostaticdischarge,orsoftwareerrors.FRUreplacementshouldbe
consideredonlywhenaproblemrecurs.
Whenanalyzinganintermittentproblem,dothefollowing:
1.Runthediagnostictestforthesystemboardinloopmodeatleast10times.
Chapter4.Relatedserviceinformation43