Unable to turn on iPhone

Hi

I have an iPhone 5, which I am not able to bring alive.

I am not able to turn it on.

When I start to charge it, nothing happens on the screen(no charging symbol). I have tried to move the battery to another iPhone and the battery works perfect in the other phone and it is at 30 % capacity.

I have tried to bring it into DFU mode 10 times (unsuccessful - but the other iPhone it succeeded 3 of 3).

If I connect it to the Mac, iTunes recognize it as an iPhone that needs recovery (but unable to read the serial -> N/A). When I start the recovery process the apple logo is shown og the iPhone with an empty process bar below (for hours). iTunes is left in a state saying: "waiting for iPhone". iTunes has is up to date. This process i have tried 10 times.

Now if I take the 2 iPhones and switch the logic boards, the problem is switched as well so the issue is at the logic board.

I'm not sure if it is a hardware or software error, but I guess it is hardware related. It is not possible to bring it to an Apple service center because the price is too high.

Please note that is not water damaged

Do you have any suggestions??

It will highly appreciated.

Best regards

Ksar