4. TROUBLE SHOOTING
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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
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Check Battery Voltage
> 3.35V
Plug Charge or Change Battery
No
Yes
Push power-on keyAnd
check the TP1 level changeinto high of
POWERKEY
Yes
Check the voltage of
The LDO outputs at U100
Check the contact of power keyOr dome-switch
No
Re-download software
Yes
Does it downloaded
normally?
Is the phone power on?
The phone will
Properly operating.
Replace U101
No
Replace U100
Does it work properly?
Replace the main board
No
No
Yes
Yes
Yes
TP1 : VRTC=2.3V, TP3 : VCORE=1.2V,
TP4 : VIO18=1.8V, TP5 : VSF=3.0V,
TP6 : VIO28=2.8V, TP7 : VA=2.8V,
TP8 : VUSB=3.3V, TP9 : VRF=2.8V,
TP10 : VTCXO = 2.8VDoes
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