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And check the level change
resistors at R107 when pushing power
Logic level at PWRON of TP2
The phone will Properly operate.
LGE Internal Use Only
START
Check Battery Voltage
> 3.30V
Yes
Push power-on key
into high of PWRKEY
Yes
Check the voltage of
key
Yes
= HIGH(above 1.2V)?
Yes
Is the phone power on?
Yes
No
Charge or Change Battery
No
Check the contact of power key
Or dome-switch
No
Replace TP1 (U100)
No
Re-download software
No
Replace TP1 (U100) and
Re-download software
Does it work properly?
Yes
Replace the main board
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Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
No
Only for training and service purposes
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