LG NP5550B Service Manual

3-9
ELECTRICAL TROUBLESHOOTING GUIDE
4. CHARGING BATTERY
Charging battery
Charging battery.
Replace IC901.
Check adapter.
Replace IC901.
OK
Connect adapter cable.
“Amber”
LED of “Power” key blink?
Is voltage of SYS_PWR
3.3 V ~ 4.2 V? (IC903 pin5)
5 V is voltage of 4.2 V ~ 5 V?
(IC901 pin18,19)
Is voltage of DRV5V
4.5 V ~ 5 V? (IC901 pin3)
Check the connection of adapter cable.
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES

LG NP5550B Specifications

General

Brand	LG
Model	NP5550B
Category	Speakers
Language	English