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4. TROUBLE SHOOTING
4.4 Power On Trouble
CHECKING FLOW
START
Check Battery Voltage
> 3.35V
YES
Push power-on key
And check the level change
into high of POWERKEY
YES
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
Charge or Change Battery
NO
Check the contact of power key
Or dome-switch
NO
Replace U100
NO
Replace U100 and Re-download software
Does it work properly?
Replace the main board
75/140
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4. TROUBLE SHOOTING
NO
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Only for training and service purposes
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