Charging Battery - LG NP7550 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

2. CHARGING BATTERY

Charging battery.
Red LED of
power key blink?
NO
Check the connection
of adapter cable.
YES
Does 9.6 V enter IC906
(Check pin2, 3)?
YES
IC906 is HIGH
(Check pin9)?
NO
YES
Charging.
NO
Connect adapter cable.
NO
Check connection
of CN900 and CN301.
Does 9.6 V come out
CN301 pin11, 12, 13?
YES
Check
connection of CN901.
Replace IC902.
3-8
NO
YES
NO
NO
YES
If it still doesn't work
Connect CN900, CN301.
Replace IC300.
YES
Does 5 V come out
CN300 pin1?
NO
Change adapter.
Connect CN901.
Change battery.