Samsung galaxy S2 GT-I9100 Power On Not Working Solution Schematic Circuit Diagram
Samsung galaxy S2 GT-I9100 Power On Not Working Solution Step By Step
Step 1
Cell-phone can`t power on.
Step 2
Check the Battery Voltage.
Is it more than 3.6V?
If its voltage level is extremely low(under 3.0V),
Change the battery.
Step 3
Power-on the phone and checkthe power-on sound
or motor vibration.
Sound or vibration is ok?
Change the MEA FRONT-OCTA LCD ASSY
SW re-download and re-booting
Step 4
Try to power on with anywayjig. If booting is success with
anyway jig,check the PK601
(soldering crack, open, etc)
Change the PK601(Power-key FPCB)
And retry to the power-on operation.
※ Test condition (Power supply 4.0V)
Step 5
Check the U501 output voltage(C535 > 2.0V, C418 or C554 > 1.2V)
If the output voltage is not satisfied with normal
condition, Change the U501.
※ Each voltage level has ±10% margin.
Step 6
Check the U501 output signal(AP_PS_HOLD(TP) > 2.8V)
If the output voltage is not satisfied with normal.
condition, Change the UCP400.
※ Each voltage level has ±10% margin.
Step 7
Check the Clock OSC500(TP213)Is that frequency 32.768Khz?
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)
Step 8
check the initial operationStep 9
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Samsung Galaxy S2 GT-I9100 Power On Dead Solution not working Solution
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