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8-3-1. Power On
Cell-phone can`t power on.
Check the Battery Voltage.
Is it more than 3.4V?
Check the key-FPCB
(open, etc)
Power-on the phone and check
the power-on sound
Sound or vibration is ok?
Check the U701 output voltage
(C523 > 1.8V, C524 > 1.8V,
C525 > 1.2V)
Check the Clock OSC500(C705)
Is that frequency 32KHz?
Check the PM500 output
signal
(AP_PS_HOLD(TP) > 1.8V)
check the initial operation
END
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Yes
Yes
No
Yes
Yes
Yes
Yes
No
Charging the battery by TA.
Abnormal
Change the key - FPCB
And retry to the power-on operation.
Yes
Change the FRONT ASSY
If the output voltage is not satisfied with normal
No
condition, Change the PM500
Change the OSC500
If OSC700 does not still work, Change the PM500
This problem is internal oscillator of PM500
No
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)
If the output voltage is not satisfied with normal.
No
condition, Change the PM500.
※ Each voltage level has ±10% margin.
8-4
Level 3 Repair
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