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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 ASSY
No
Check the voltage level at
R5025 while pressing power
key. If the voltage high?
No
Replace the Power key FPCB
Yes
Check the signal of PWRHOLD
(U7034) = 1.8V
No
Check the output voltage of U5002
(C5042 ,C5039,C5041, C5047, C5052,C5074= 0.8V
C5060=1.1V and C5063=1.3V C5044=2.0V and
other LDO Voltage.)
If the output voltage is not normal, Change the
U5002.
※
Each voltage level has ±10% margin.
Yes
Check the Clock OSC5000
Is the frequency 19.2MHz?
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 3.5V?
