Level 3 Repair
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8-7
8-3-1. Power On
Check the ANT902/ANT903
Are power-key clips damaged ?
Cell-phone can`t power on.
Change the power-key clips.
And retry to the power-on operation.
END
No
Yes
Check the U800 output voltage
(C835=1.225V, C838=1.05V)
If the output voltage is not satisfied with normal
condition, replace U800.
No
Yes
Check the U800 output signal
(PM8917_PS_HOLD(R804) =
1.8V)
If the output voltage is not satisfied with normal.
condition, replace UCP600
No
Yes
Check the Battery Voltage.
Battery >
3.4V?
Connect TA to charge the battery.
check the initial operation
Yes
Abnormal
Check the OSC801
Is it around 32KHz?
Change the OSC801
If OSC800 still does not work, replace U800
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
No
Yes
Yes
Change the LCD ASSY
Power-on the phone and check
the power-on sound
or motor vibration.
Sound or vibration ok ?
Yes
No
