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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
YES
NO
YES
4. TROUBLE SHOOTING
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U102
VCORE=1.2V, VPMU=1.2V, VDDMS=1.3V
VAUX=2.85V,VMMC=2.85V,
VDD_RF2=2.5V
VDDXO=1.3V, VDDTDC=1.3V, VRF1=1.8V
Replace U102 and Re-download software
Does it work properly?
NO
Replace the main board
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4. TROUBLE SHOOTING
Only for training and service purposes
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