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Level 3 Repair
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8-5
8-3-1. Power On
Check the
TAC302
(soldering crack, open, etc)
Cell-phone can`t power on.
Change the
TAC302
(Power-key)
And retry to the power-on operation.
END
No
Yes
Check the U602 output voltage
(C633 = 2.0V, C655 = 1.1V)
If the output voltage is not satisfied with normal
condition, Change the U602.
※
Each voltage level has ±10% margin.
No
Yes
Check the TP406 output signal
(AP_PS_HOLD(TP) = 2.8V)
If the output voltage is not satisfied with normal
condition, Change the U602.
※
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 OSC600(TP207)
Is that frequency 32.768Khz?
Change the OSC600.
If OSC600 does not still work, Change the U602
This problem is internal oscillator of U602.
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
No
Yes
Yes
Change the SPK module.
Change Front LCD Ass'y.
Change the Vibration Motor module.
Power-on the phone and check
the power-on sound, display
and motor vibration.
Are they ok?
Yes
No