Hardware Maintenance Manual - Lenovo Y40 50 Series

21
General checkout
Power system checkout
Toverifyasymptom,followthestepsbelow:
1. Turnoffthecomputer.
2. Removethebatterypack.
3. ConnecttheACadapter.
4. Makesurethatpowerissuppliedwhenyouturnonthecomputer.
5. Turnoffthecomputer.
6. DisconnecttheACadapterandinstallthechargedbatterypack.
7. Makesurethatthebatterypacksuppliespowerwhenyouturnonthe
computer.
Ifyoususpectapowerproblem,seetheappropriateoneofthefollowingpower
supplycheckouts:
• “CheckingtheACadapter”onpage21
• “Checkingoperationalcharging”onpage21
• “Checkingthebatterypack”onpage22
Checking the AC adapter
YouareherebecausethecomputerfailsonlywhentheACadapterisused.
• Ifthepower-onindicatordoesnotturnon,checkthepowercordoftheAC
adapterforcorrectcontinuityandinstallation.
• Ifthecomputerdoes notcharge duringoperation,goto“Checking
operationalcharging”.
TochecktheACadapter,followthestepsbelow:
1. UnplugtheACadaptercablefromthecomputer.
2. Measuretheoutputvoltage atthe plugoftheACadaptercable.Seethe
followinggure:
1
2
9ROWDJH9'&


3LQ


Note:
OutputvoltagefortheACadapterpinNo.2maydifferfromtheoneyou
areservicing.
3. Ifthevoltageisnotcorrect,replacetheACadapter.
4. Ifthevoltageisacceptable,dothefollowing:
• Replacethesystemboard.
• Iftheproblempersists,goto“LenovoY40-70/Y40-80/Y50-70/Y50-80/Y50-70
Touch/Y50-80Touch”onpage26.
Note:
NoisefromtheACadapterdoesnotalwaysindicateadefect.
Checking operational charging
Tocheckwhetherthe batterychargesproperlyduringoperation,usea
dischargedbatterypackorabatterypackthathaslessthan50%ofthetotal
powerremainingwheninstalledinthecomputer.