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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.
Sound or Vibration is
ok?
END
check the initial operation (8-4-3)
YES
YES
Check the signal of
AP_PS_HOLD = 1.8V
#1 Check the TP7005 is 1.8V
#2 Check the output voltage of U7001 and U7004
- C10009 = 3.3V
- TP_UB6000 = 1.8V
※
Each voltage level has ±10% margin
→
Replace the PBA
If the voltage level is
abnormal,
#4 Check the Clock OSC7000.
Frequency is 38.4MHz
※
Test condition (Oscilloscope setting)
: 20.0ns/div (time division) , 500mV/div (voltage)
Replace the PBA
N
O
YES
When pressing Power
key, check if the Power
key FPCB pad on front
is shorted
df
crack,open,etc)
Replace the POWER KEY FPCB
N
O
YES
No
Mobile phone does not power on
Check the Battery
Voltage level.
Is it more than 3.5V?
Charging the battery by TA.
If the voltage has not reached over 3.5V,
replace the battery first.
Even if changed the battery, the battery
voltage has not reached, replace the PBA
NO
YES
Replace the Front assembly including display.
Yes
