LG KP220 Service Manual page 85

2. Can not charge battery(Use adaptor)
START
YES
Charging Connector
J704 well-soldered ?
YES
Voltage at Pin 12 , 13 ,
15 (VCHG) of J704 = 5 V?
YES
Voltage at pin 3 (VCHRIN)
of U501 = 5 V ?
YES
Voltage at pin 4 of
U501 =4 V?
YES
Pin 5 , 6 of U502
GPIO31_CHR_CLT = high ?
EINT2_CHARG ER = high ?
YES
Voltage at pin 5~8 of R510
= 1.4 V ?
YES
Is the battery charged ?
NO
NO
NO
NO
NO
NO
NO
KP220 SERVICE MANUAL V1.2
Re-soldering J704 or
change J704
The charging adaptor is out of order.
Change the charging adaptor
F501 is 0 Ω , Change U502
F501 is not 0 Ω , change F501
Change U501
GPIO31_CHR_CLT = low , Change U401
EINT2_CHARGER = low , Change U502
Change U401
The battery may have the problem
Change the battery and again.