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8. Level 3 Repair
8-4-1. Power On
Mobile phone does not power on.
Yes
No
Charging the battery by TA.
If its voltage level is extremely low
(under 3.0V),
Change the battery.
Yes
END
Yes
Power-on the phone and check
the power-on sound
or motor Vibration.
Sound or Vibration is ok?
Yes
Change the FRONT-LCD ASSY
No
Check the voltage level at
R5017 while pressing power
key. Is the voltage high?
No
Replace the Power key FPCB
Yes
Check the signal of
TRST_N = 1.8V
No
Check the output voltage of U5000
L5000 > 0.75V, L5001 > 0.75V, L5002
> 0.75V,
L5003 > 0.75V, L5004 > 0.75V, L5005
> 0.75V,
L5006 > 0.75V, L5008 > 1.1V, L5009
> 1.3V, L5010 > 2.0V, L5011 > 0.75V
and other LDO Voltage
If the output voltage is not normal,
Change the U5000
Yes
Check the Clock OSC5000
Is the frequency 32.768kHz?
No
Replace the OSC5000
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
Yes
Check the initial operation
Check the Battery Voltage.
Is it more than 3.8V?