Table of Contents
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Checking Flow
START
YES
Check Battery Voltage
> 3.2V ?
YES
Push power-on key and check
the level change of
U400 PWR_ON_SW high?
YES
Check the voltage of
the following port at U400
+2.4V_MSMC
+2.8V_MSMP
+2.6V_MSMA
+2.8V_TCXO
+2.6V_RX
+2.6V_TX
YES
Logic level at PS_HOLD
of U201=High ?
YES
Does it work properly?
YES
The Phone will power on.
NO
Charge of Change Battery and try again
NO
Check the contact of power-key
NO
NO
Re-download software & try again
NO
The power-on procedure is completed.
The problem may be elsewhere.
YES
or dome switch
Replace U400
NO
Does it work properly?
Replace the main board.
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