Level
3
Repair
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’s
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strictly prohibited.
Confidential and proprietary-the contents in this service guide subject to change without prior notice.
8-5
8-3-1.
Power On
Check the power key
(
open, etc)
Device can`t power on.
Change the power key
And retry to the power-on operation.
END
No
Yes
Check the U401 output voltage
(
C427,C428
>1.8
V,
C430
>1.2
V)
If the output voltage is not satisfied with normal
condition, Change the U401
No
Yes
No
Check the Battery Voltage
.
Is
it more than
3.4
V?
Charging the battery by TA.
check the initial operation
Yes
Abnormal
Check the Clock OSC400
Is that frequency
32
KHz?
Change the OSC400
If OSC400 does not still work, Change the U401
This problem is internal oscillator of U401
※
Test condition
(
Oscilloscope setting)
:20.0
us.div
(
time division)
Yes
Change the FRONT ASSY
Power-on the phone and check
the power-on sound is ok?
Yes
No
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