4. TROUBLE SHOOTING
- 64 -
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
START
Check Battery Voltage
> 3.35V
Push power-on key
And check the TP1 level change
into high of POWERKEY
Check the voltage of
The LDO outputs at U101
Is the phone power on?
The phone will
Properly operating.
Plug Charge or Change Battery
Check the contact of power key
Or dome-switch
YES
YES
YES
NO
NO
NO
NO
CHECKING FLOW
TP6 :VCORE=1.2V, TP4 : VPMU=1.2V. TP1 :
VRTC=2.3V, TP3: VDD_1.8V=1.8V, TP7:
VAUX=2.8V, TP8: VDDXO=1.3V, TP5: VREF=1.2V
Does it work properly?
Replace the main board
Replace U102
Re-download software
YES
NO
Does it downloaded
normally?
Replace U103
NO
YES
YES