•Ifthepower-onindicatordoesnotturnon,checkthepowercordoftheacpoweradapterforcorrect
continuityandinstallation.
•Ifthecomputerdoesnotchargeduringoperation,goto“Checkingoperationalcharging”onpage31.
Tochecktheacpoweradapter,dothefollowing:
1.Unplugtheacpoweradaptercablefromthecomputer.
2.Measuretheoutputvoltageattheplugoftheacpoweradaptercable.Seethefollowinggure:
Pin
Voltage(Vdc)
1+20
20
3
Ground
Note:Outputvoltageacrosspin2oftheacpoweradaptermightdifferfromtheoneyouareservicing.
3.Ifthevoltageisnotcorrect,replacetheacpoweradapter.
4.Ifthevoltageisacceptable,replacethesystemboard.
Note:Noisefromtheacpoweradapterdoesnotalwaysindicateadefect.
Checkingoperationalcharging
Tocheckwhetherthebatterychargescorrectlyduringoperation,useadischargedbatterypackorabattery
packthathaslessthan50%ofthetotalpowerremainingwheninstalledinthecomputer.
Performoperationalcharging.Ifthebatterystatusindicatororicondoesnotturnon,removethebattery
packandletitreturntoroomtemperature.Reinstallthebatterypack.Ifthechargeindicatororiconstilldoes
notturnon,replacethebatterypack.
Ifthechargeindicatorstilldoesnotturnon,replacethesystemboard.Thenreinstallthebatterypack.Ifitis
stillnotcharged,gotothenexttopic.
Checkingthebatterypack
ThebatterystatusiconintheWindowsnoticationareadisplaysthepercentageofbatterypowerremaining.
Tocheckfordetailedbatterystatusinformation,dothefollowing:
•ForWindows7:OpenthePowerManagerprogramandclicktheBatterytab.
•ForWindows8:OpentheLenovoSupportprogramandclickBatteryHealth,oropentheLenovo
SettingsprogramandclickPower.
Note:Ifthebatterypackbecomeshot,itmaynotbeabletocharge.Removeitfromthecomputerandleave
itatroomtemperatureforawhile.Afteritcoolsdown,reinstallandrechargeit.
Tocheckthebatterypack,dothefollowing:
1.Poweroffthecomputer.
2.Removethebatterypackandmeasurethevoltagebetweenbatteryterminals1(+)and7(-).Seethe
followinggure:
Chapter3.Generalcheckout31
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