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8. Level 3 Repair
8-4. Power On
Mobile phone does not power on.
Check the Battery
Voltage.
Is it more than 3.8V?
Charging the battery by TA.
If its voltage level is extremely low(under 3.0V),
Change the battery.
Power-on the phone and
check the power-on sound
or motor Vibration.
Sound or Vibration is ok?
Change the FRONT-LCD ASSY
Check the voltage level at
ANT6002 or R6015 while pressing
power key. Is the voltage high?
Check the signal of
PMIC_PWR_HOLD =
1.8V
Check the Clock OSC5000
Is the frequency 24Mhz?
Replace the POWER KEY FPCB.
Check the output voltage of U5004
(L5002 = 0.8V, L5004 = 0.8V, L5003 = 0.8V, L5005 = 1.35V,
L5006 = 2.0V, C5006 = 1.8V and other LDO Voltage.)
If the output voltage is not normal, Change the U5004.
※ Each volta
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