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8. Level 3 Repair
8-4-1. Power On
Mobile phone does not power on.
Yes
No
No
Charging the battery by TA.
If its voltage level is extremely low
(under 3.0V),
Change the battery.
Yes
No
END
Yes
No
Yes
Change the FRONT-LCD ASSY
No
No
Replace the Power key FPCB
Yes
No
No
Check the output voltage of U12003
L8026 > 0.75V, L8005 > 0.75V,
L8007 > 0.75V, L8008 > 0.75V,
L8010 > 0.75V, L8015 > 1.1V,
L8013 > 0.6V, L8014 > 0.85V,
L8012 > 0.75V, L8022 > 1.3V
L8016 > 2.0V, L8002 > 0.75V
If the output voltage is not normal,
Change the U12003.
※
Each voltage level has ±10% margin.
Yes
No
Check the Clock OSC8000&U12003
Is the frequency 32.768MHz?
No
Replace the OSC8000 & U12003
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
Yes
No
Check the initial operation
Check the Battery Voltage.
Is it more than 3.8V?
Check the signal of
AP_PS_HOLD = 1.8V
Check the voltage level at
R304 while pressing power
key. Is the voltage high?
Power-on the phone and check
the power-on sound
or motor Vibration.
Sound or Vibration is ok?