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8. Level 3 Repair
8-4-1. Power on
Power-on the phone and
check the power-on
sound
or motor Vibration.
END
check the initial operation (8-4-3)
YES
YES
Check the signal of
AP_PS_HOLD = 1.8V
#1 Check the TP7013 is High.
#2 Check the output voltage of U7002
- L7008 = 2.04V, L7004 = 0.75V,
- L7006 = 1.35V, L7010 = 1.025V
- L7007 = 1.8V, L7005 = 1.125V,
- L7013 = 0.75V
#3 Check the TP5006 is Low
※
Each voltage level has ±10% margin
→
Change the U7002
If the voltage level is
abnormal,
#4 Check the Clock OSC7000.
Frequency is 38.4MHz
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
Replace the OSC7000.
N
O
YES
When pressing Power
key, check if the Power
key FPCB pad on front
is shorted
Replace the POWER KEY FPCB
N
O
YES
YES
Mobile phone does not power on
Check the Battery
Voltage level.
Is it more than 3.5V?
Charging the battery by TA. If its voltage level
is extremely low (under 1.5V),
Charge current is only 100mA.
It will take more time to meet booting voltage
NO
YES
Change the FRONT-LCD ASSY
N
O
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