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8. Level 3 Repair
8-4-1. Power On
Mobile phone does not power on.
Check the Battery Voltage.
Is it more than 3.8V?
Power-on the phone and check
the power-on sound
or motor Vibration.
Sound or Vibration is ok?
Check the voltage level at
R3017 while pressing power
key. Is the voltage low?
Check the signal of
AP_PS_HOLD(TP6006) = 1.8V
Check the initial operation
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Yes
No
Yes
No
No
Yes
No
Yes
No
Yes
No
END
Charging the battery by TA.
No
If its voltage level is extremely low
Change the battery.
Yes
Change the FRONT-UB ASSY
No
Replace the Power key FPCB
Check the output voltage of U6000/U6003
No
If the output voltage is not normal, Change the
U6000/U6003
(under 3.0V),
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