Lenovo Flex 2 Pro-15/Edge 15
21
Toverifyasymptom,followthestepsbelow:
1. Turnoffthecomputer.
2. Removethebatterypack.
3. ConnecttheACadapter.
4. Makesurethatpowerissuppliedwhenyouturnonthecomputer.
5. Turnoffthecomputer.
6. DisconnecttheACadapterandinstallthechargedbatterypack.
7. Makesurethatthebatterypacksuppliespowerwhenyouturnonthe
computer.
Ifyoususpectapowerproblem,seetheappropriateoneofthefollowingpower
supplycheckouts:
• “CheckingtheACadapter”onpage21
• “Checkingoperationalcharging”onpage21
• “Checkingthebatterypack”onpage22
Checking the AC adapter
YouareherebecausethecomputerfailsonlywhentheACadapterisused.
• Ifthepower‐onindicatordoesnotturnon,checkthepowercordoftheAC
adapterforcorrectcontinuityandinstallation.
• Ifthecomputerdoesnotchargeduringoperation,goto“Checking
operationalcharging”onpage21.
TochecktheACadapter,followthestepsbelow:
1. UnplugtheACadaptercablefromthecomputer.
2. MeasuretheoutputvoltageattheplugoftheACadaptercable.Seethe
followingfigure:
Note:OutputvoltagefortheACadapterpinNo.2maydifferfromtheoneyou
areservicing.
3. Ifthevoltageisnotcorrect,replacetheACadapter.
4. Ifthevoltageisacceptable,dothefollowing:
• Replacethesystemboard.
• Iftheproblempersists,goto“LenovoFlex2Pro‐15/Edge15”onpage28.
Note:NoisefromtheACadapterdoesnotalwaysindicateadefect.
Checking operational charging
Tocheckwhetherthebatterychargesproperlyduringoperation,usea
dischargedbatterypackorabatterypackthathaslessthan50%ofthetotal
powerremainingwheninstalledinthecomputer.
Voltage (V DC)
+20
0
Pin
1
2
2
1
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