Level 3 Repair
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8-5
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
(C730 > 2.0V, C746 > 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
(AP_PS_HOLD(TP) > 2.8V)
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 3.6V?
Charging the battery by TA.
If its voltage level is extremely low(under 3.0V),
Change the battery.
check the initial operation
Yes
Abnormal
Check the Clock OSC701(C237)
Is that frequency 32KHz?
Change the OSC701.
If OSC400 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
or motor biration.
Sound or Biration is ok?
Yes
No
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