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8. Level 3 Repair
8-4-1. Power On
Mobile phone does not power on.
Yes
N
No
Charging the battery by TA.
If its voltage level is extremely low
(under 3.0V),
Change the battery.
END
Yes
Power-on the phone and check the
power-on sound
or motor Vibration.
Sound or Vibration is ok?
No
Change the FRONT-LCD ASSY
Yes
Check the voltage level at R3002 while
pressing power key. Is the voltage low?
No
Replace the Power key FPCB
Yes
Check the signal of SDM_PS_HOLD =
1.8V
No
Check the output voltage of U5005
If the output voltage is not normal, Change the
U5005.
Check the Clock OSC5000&U5005
Is the frequency 38.4Hz?
No
Replace the OSC5000&U5005
Check the initial operation
Check the Battery Voltage.
Is it more than 3.8V?
Yes
Yes
Yes