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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 TP8002 is 1.8V
#2 Check the output voltage of U12019
L8026 > 0.75V, L8005 > 0.75V, L8007 > 0.75V,
L8008 > 0.75V, L8010 > 0.75V, L8015 > 1.1V,
L8013 > 0.6V, L8014 > 0.85V, L8012 > 0.75V,
L8018 > 1.3V,L8016 > 2.0V, L8000 > 0.75V
※
Each voltage level has ±10% margin
→
Replace the U12019 or the PBA
If the voltage
level is abnormal,
#4 Check the Clock OSC8000.
Frequency is 32.768KHz
※
Test condition (Oscilloscope setting)
: 20.0ns/div (time division) , 500mV/div (voltage)
Replace the OSC7000.
N
O
YES
When pressing Power
key, check if the Power
key FPCB pad on front
is shorted
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?
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