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CHECKING FLOW
START
Check Battery Voltage
> 3.2V
YES
Push power-on key
And check the level change
of PWRKEY
YES
Check the voltage of
The LDO outputs at U201
YES
Logic level at KEYON of U201
= HIGH
YES
Does it work properly?
YES
THE PHONE WILL
POWER ON.
NO
Charge or Change Battery
NO
Check the contact of power key
NO
VCORE=1.8V
VMEM=2.8V
VEXT=2.8V
NO
Re-download software
NO
The power-on procedure is
Completed. The problem may
be elsewhere.
-49-
4. TROUBLE SHOOTING
Or dome-switch
Replace U201
VVCXO=2.75V
VSIM=1.8V or 2.85V
VMIC=2.5V
Does it work properly?
NO
Replace the main board
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