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Level 3 Repair
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Confidential and proprietary-the contents in this service guide subject to change without prior notice.
8-5
8-3-1. Power On
Check the key-FPCB
(open, etc)
Change the key
-
FPCB
And retry to the power-on operation.
END
No
Yes
Check the U701 output voltage
(C737 > 1.8V, C738 > 1.2V,
C734 > 1.2V, C735 > 1.3V
C736 > 1.2V)
If the output voltage is not satisfied with normal
condition, Change the U701.
※
Each voltage level has ±10% margin.
No
Yes
Check the U701 output signal
(nRESPWRON(R704) > 1.8V)
If the output voltage is not satisfied with normal.
condition, Change the U701.
※
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(C715)
Is that frequency 32KHz?
Change the OSC700
If OSC700 does not still work, Change the U701
This problem is internal oscillator of U701.
※
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 is ok?
Yes
No
Cell-phone can`t power on.
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