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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 U100
YES
Is the phone power on?
YES
The phone will
Properly operating.
LGE Internal Use Only
NO
YES
NO
YES
NO
NO
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U100
TP1_VDDRF2=2.5V, TP2_VDDTRX=1.4V, TP3_VRF1=1.8V,
TP4_VUSB=3.1V, TP5_VPMU=1.3V, TP6_VAUX=2.85V,
TP7_VDDXO=1.3V,
TP8_VDDTDC=1.3V, TP9_VAB=4.2V,
TP10_VCORE=1.2V, TP11_VDD_IO=1.8V
Replace U100 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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