IBM ThinkPad T410s Manual de usuario Pagina 64

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OnepixelconsistsofR,G,Bsub-pixels.
Table6.LCD-relatedsymptoms
Symptomorerror
FRUoraction,insequence
Nobeep,power-onindicatoron,andablankLCDduring
POST.
Systemboard.
LCDbacklightnotworking.
LCDtoodark.
LCDbrightnesscannotbeadjusted.
LCDcontrastcannotbeadjusted.
1.ReseattheLCDconnectors.
2.LCDassembly.
3.Systemboard.
LCDscreenunreadable.
Charactersmissingpixels.
Screenabnormal.
Wrongcolordisplayed.
1.Seeimportantnotefor“LCD-relatedsymptoms.
2.ReseatallLCDconnectors.
3.LCDassembly.
4.Systemboard.
HorizontalorverticallinesdisplayedonLCD.LCDassembly.
Intermittentproblems
Intermittentsystemhangproblemscanbeduetoavarietyofcausesthathavenothingtodowithahardware
defect,suchascosmicradiation,electrostaticdischarge,orsoftwareerrors.FRUreplacementshouldbe
consideredonlywhenaproblemrecurs.
Whenanalyzinganintermittentproblem,dothefollowing:
1.Runthediagnostictestforthesystemboardinloopmodeatleast10times.
2.Ifnoerrorisdetected,donotreplaceanyFRUs.
3.Ifanyerrorisdetected,replacetheFRUshownbytheFRUcode.Rerunthetesttoverifythatno
moreerrorsexist.
Undeterminedproblems
Ifthediagnostictestsdidnotidentifytheadapterordevicethathasfailed,ifwrongdevicesareinstalled,
orifthesystemsimplyisnotoperating,followtheseprocedurestoisolatethefailingFRU(donotisolate
FRUsthathavenodefects).
Verifythatallattacheddevicesaresupportedbythecomputer.
Verifythatthepowersupplybeingusedatthetimeofthefailureisoperatingcorrectly.(See“Powersystem
checkout”onpage41.)
1.Turnoffthecomputer.
2.VisuallycheckeachFRUfordamage.ReplaceanydamagedFRU.
3.Removeordisconnectallofthefollowingdevices:
a.Non-ThinkPaddevices
b.Devicesattachedtothedockingstationortheportreplicator
c.Printer,mouse,andotherexternaldevices
d.Batterypack
e.Harddiskdrive
f.Externaldiskettedriveoropticaldrive
g.DIMM
h.Opticaldiskordisketteintheinternaldrive
i.PCCards
4.Turnonthecomputer.
58HardwareMaintenanceManual
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