Level 3 Repair
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8-5
8-3-1. Power On
Check the key-FPCB
(open, etc)
Cell-phone can`t power on.
Change the key
-
FPCB
And retry to the power-on operation.
END
No
Yes
Check the U500 output voltage
(C727 > 1.0V, C725 > 0.9V,
C724 > 1.0V, C739 = 1.8V)
If the output voltage is not satisfied with normal
condition, Change the U700
No
Yes
Check the U700 input signal
(AP_PS_HOLD(TP) > 1.8V)
If the output voltage is not satisfied with normal.
condition, Change the UCP600.
※
Each voltage level has ±10% margin.
No
Yes
Check the Battery Voltage.
Is it more than 3.4V?
Charging the battery by TA.
check the initial operation
Yes
Abnormal
Check the Clock OSC700(C714)
Is that frequency 32KHz?
Change the OSC700
If OSC500 does not still work, Change the U700
This problem is internal oscillator of U700.
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
No
Yes
Yes
Change the FRONT ASSY
Power-on the phone and check
the power-on sound.
Is Sound ok?
Yes
No