LG KF600w Service Manual page 90

START
Check battery voltage > 3.4V
YES
Push power - on key and
check the level change of U301
PWR_ON
YES
Check the voltage of
the following port at U301
+1.4V_MSMC
+1.8V_MSMP 1
+2.6V_MSMP 2
+2.6V_MSMA
+2.8V_TCXO
YES
Logic level at PS _ HOLD (R301 )
of U301=High ?
YES
Does it work properly?
YES
The Phone will power on
Checking Flow
Checking Flow
Charge of Change Battery and try again
NO
Check the contact of power-key
NO
NO
NO
NO
Re-download software
and try again
Replace U301
Re-download software
and try again
YES
Does it work properly?
NO
Re-download software
and try again