LG KG270 Service Manual page 54

Power On Trouble
CHECKING FLOW
Check Battery Voltage
Push power-on key
And check the level change
of PWRKEY
Check the voltage of
The LDO outputs at U102
THE PHONE WILL
POWER ON.
START
NO
> 3.35V
YES
NO
YES
NO
YES
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4. TROUBLE SHOOTING
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U102
LDO VOLTAGE PART
V_BUF 3.2V C101
V_MEM 2.8V C109
V_IO 2.8V C107
V_SIM 2.85V C108
VRF0 1.5V C110
V_ANA 2.5V C113