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Checking Flow
START
Check Battery Voltage
> 3.3V ?
Push power-on key and check
the level change of
U302 PWR_ON
Check the voltage
Level of the following port at 302
+1.4V_MSMC
+2.6V_MSMP2
+1.8V_MSMP1
+2.6V_MSMA
+2.8V_TCXO
+2.9V_RX
The logic level at
PS_HOLD(C3102)
of U302 = High ?
Does it work properly?
YES
The Phone will power on.
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
The power-on procedure is completed.
The problem may be elsewhere.
Charge of Change Battery and try again
Check the contact of power-key
or dome switch
Replace the U302
Re-download software & try again
Does it work properly?
Replace the main board.
NO
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