Power On - Samsung GT-I9300 Service Manual

8-3-1. Power On

Cell-phone can`t power on.
Check the Battery Voltage.
Is it more than 3.4V?
Power-on the phone and check
the power-on sound
or motor biration.
Sound or Biration is ok?
Check the SW600
(soldering crack, open, etc)
Check the U500 output voltage
(C561 = 1.0V, C559 = 1.1V,
C558 = 1.0V, C556 = 1.0V)
Check the U500 output signal
(AP_PS_HOLD(TP) > 1.8V)
Check the Clock OSC500(C505)
Is that frequency 32Khz?
check the initial operation
END
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Yes
No
Yes
Yes
Yes
Yes
Yes
Charging the battery by TA.
No
If its voltage level is extremely low(under 3.0V),
Change the battery.
Yes
Change the MEA FRONT-OCTA LCD ASSY
Abnormal
Change the SW600(Power-key)
And retry to the power-on operation.
If the output voltage is not satisfied with normal
No
condition, Change the U501.
※ Each voltage will be changed from 0.9V to
1.3V during booting.
If the output voltage is not satisfied with normal.
No
condition, Change the U500.
※ Each voltage level has ±10% margin.
Change the OSC500.
If OSC400 does not still work, Change the U501
No
This problem is internal oscillator of U501.
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)
8-5
Level 3 Repair