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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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 U100
Is the phone power on?
The phone will
Properly operating.
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
Does it work properly?
Replace the main board
YES
YES
YES
YES
NO
NO
NO
NO
NO
Replace U100 and Re-download software