Level 3 Repair
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8-4
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 U701 output voltage
(C523 > 1.8V, C524 > 1.8V,
C525 > 1.2V)
If the output voltage is not satisfied with normal
condition, Change the PM500
No
Yes
Check the PM500 output
signal
(AP_PS_HOLD(TP) > 1.8V)
If the output voltage is not satisfied with normal.
condition, Change the PM500.
※
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 OSC500(C705)
Is that frequency 32KHz?
Change the OSC500
If OSC700 does not still work, Change the PM500
This problem is internal oscillator of PM500
※
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
Sound or vibration is ok?
Yes
No
