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8. Level 3 Repair
8-4-1. Power On
Mobile phone does not power on.
Yes
No
No
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
Yes
No
END
Yes
No
Yes
Change the FRONT-LCD ASSY
No
No
Replace the Power key FPCB
Yes
No
No
#1 Check the output voltage of U5000
- C5142 = 1.8V
- C5104 = 2.8V
- C5083 = 2.2V
※
Each voltage level has ±10% margin
→
Replace the U5000 or the PBA If the
voltage level is abnormal,
#4 Check the Clock OSC5000.
Frequency is 26MHz
※
Test condition (Oscilloscope setting)
- 20.0ns/div (time division)
- 500mV/div (voltage)
→
Replace the OSC5000.
Yes
No
Check the initial operation
Check the Battery Voltage.
Is it more than 3.5V?
Check the signal of AP_GOOD
= 1.8V
When pressing Power key,
check if the Power key FPCB
pad on front is shorted
Power-on the phone and check
the power-on sound
or motor Vibration.
Sound or Vibration is ok?
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