Level 3 Repair
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8-5
8-3-1. Power On
Check the PWR 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 U701 output voltage
(C731>1.1V, C732>1.0V,
C760>1.0V, C763>1.25V,
C764>2.0V,)
If the output voltage is not satisfied with normal
condition, Change the U701
No
Yes
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
Is that frequency 32KHz?
Change the OSC700
If OSC700 does not still work, Change the U701
Yes
Change the FRONT ASSY
Power-on the phone and check
the power-on sound.
Sound is ok?
Yes
No
