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