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8. Level 3 Repair
8-1
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8-3-1. Power On
Check the HDC601
Cell-phone can`t power on.
Change the HDC601(Power-key)
And retry to the power-on operation.
END
No
Yes
Check the U500 output voltage
(C552 = 1.1V, C550 = 1.0V,
C549 = 1.0V, C547 = 1.0V)
If the output voltage is not satisfied with normal
condition, Change the U501.
※
Each voltage will be changed from 0.9V to
1.3V during booting.
No
Yes
Check the U500 output signal
(AP_PS_HOLD(TP) > 1.8V)
If the output voltage is not satisfied with normal.
condition, Change the U500.
※
Each voltage level has ±10% margin.
No
Yes
Check the Battery Voltage.
Is it more than 3.4V?
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 OSC500(C506)
Is that frequency 32Khz?
Change the OSC500.
If OSC400 does not still work, Change the U501
This problem is internal oscillator of U501.
※
Test condition (Oscilloscope setting)
: 20.0us.div (time division)
No
Yes
Yes
Change the FRONT-OCTA LCD ASSY
Power-on the phone and check
the power-on sound
or motor biration.
Sound or Biration is ok?
Yes
No