LG -C300 Service Manual page 73

4. TROUBLE SHOOTING
CHECKING FLOW
START
Check Battery Voltage
> 3.35V
Push power-on key
And check the level change
into high of POWERKEY
Check the voltage of
The LDO outputs at U102
Is the phone power on?
The phone will
Properly operating.
LGE Internal Use Only
NO
YES
NO
YES
NO
VCORE=1.2V, VPMU=1.2V. VRTC=2.3V, VUSB=3.1V
VAUX=2.85V,VMMC=2.85V, VDD_RF2=2.5V,
VDDMS=1.3V, VDDXO=1.3V, VDDTDC=1.3V
YES
NO
YES
4. TROUBLE SHOOTING
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U101
Replace U101 and
Re-download software
Does it work properly?
NO
Replace the main board
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