I9300 no power no charging probleme

I have i9300 phone when connecting to power supply I get a reading 0.08A without pressing power key after pressing power key and keep pressing I get a 0.38 A after few minutes
I get a cutting of amperage…. And when I remove my hand of
Power key the current return directly to 0.08A
I have tested output voltage of U500 all are OK and check capacitors
I have changed osc500 & osc400 same problem
I have changed U501 same problem
I have changed Ucp400 same problem
How to get rid of 0.08A without pressing power key???
I think my problem could be solved when I change UEM300???