Samsung galaxy S4 I9500 Power Not On Solution

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Samsung  galaxy S4 I9500 Power Not On Solution Schematic , Diagram , Circuit

Samsung  galaxy S4 I9500 Power Not On Solution Step By Step

Step 1

Mobile phone does not power on.

Step 2

Check the Battery Voltage.
Is it more than 3
.8V?

Charging the battery by TA.
If its voltage level is extremely low(under 3.0V),

Change the battery

Step 3

Power-on the phone and
check the power-on sound
or motor Vibration.

Sound or Vibration is ok?

Change the FRONT-LCD ASSY

Step 4

Check the TAC1000

(soldering crack, open, etc)

Change the TAC1000(Power-key switch)
And retry to the power-on operation.

Step 5

Check the U600 output voltage

(C665 > 1V,C664 > 1V)

If the output voltage is not satisfied with normal
condition, Change the U600.

※ Each voltage level has ±10% margin.

Step 6

Check the Clock OSC5000

Is that frequency 24Mhz?

Change the OSC5000.
Test condition (Oscilloscope setting)

20.0us.div (time division)

Step 7

check the initial operation

Step 8

END

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