let say it`s for the learning purposes...Forget about the money...

That presents an age old argument in education. Should students be made to just wander around and "discover" or should there be guidance? Since statistically, there are far more ways to do something wrong than there are to do it right, most educators I have known believe there needs to be guidance with some exploration based thereon.

You are being given guidance, not answers. For example, your test results on the mosfet do not prove it to be faulty. Source to drain conduction is expected. Drain to source conduction could be something else. Now, if you don't mind destroying the board and remove the mosfet, you can test it in isolation. But, once you damage the board, then your hopes of repairing it for education go out the window.

 

the thread is for helping. i am not telling that i am a millioner and am looking for work to help for charity.

I will read the whole thread again and will write later.

 

After re-soldering the connections that I suggested you should check and see if the problem remains. You did not mention how long the system ran after you did what you did, but usually a defective capacitor stays defective, while a poor solder connection will be intermittent until it either stays open or is repaired. And a laptop main board is really not something to play with. Just removing it and replacing it is two hours labor. And it is not clear as to why you think that the problem is a failed capacitor, which is not my thought about a failure of this kind.

 

I won`t lie that most of times i am asking questions about client`s technichs. I have not bad soldering/desoldering skills and the worst that can be will be that the board will stay as it was. The 'interesting' is that they were comming once i removed the battery and the power adapter push the power button to put out the current of the capacitors and when put back the battery and charger the laptop was working but after few days they were comming again and then that was not a solution. That made me think that i have probably problem with capacitor