Power On; Cell-Phone Can`t Power On - Samsung GT-i9100 Service Manual

8-3-1. Power On

Cell-phone can`t power on.

Check the Battery Voltage .
Is it more than 3.6V?
Check the PK601
(soldering crack, open, etc)
Check the U501 output voltage
(C535 > 2.0V, C554 > 1.2V)
Check the U501 output signal
(AP_PS_HOLD(TP) > 2.8V)
Check the Clock OSC500(TP213)
Is that frequency 32Khz?
check the initial operation
END
Yes
Yes
Yes
Yes
Yes
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Charging the battery by TA.
No
If its voltage level is extremely low(under 3.0V),
Change the battery.
Abnormal
Change the PK601(Power-key FPCB)
And retry to the power-on operation.
If the output voltage is not satisfied with normal
No
condition, Change the U501.
※ Each voltage level has ± 10% margin.
If the output voltage is not satisfied with normal.
No
condition, Change the U501.
※ Each voltage level has ± 10% margin.
Change the OSC500.
If OSC400 does not still work, Change the U501
This problem is internal oscillator of U501.
No
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)
8-5
Level 3 Repair