Hi Raoul,
I am in a similar situation with a Gamepad, however in my case is quite different.
I replaced the LCD and touch screen and getting response from the touch screen and sounds.
In my case seems to be video related issues, in your case I recommend you to verify the wifi/bluetooth cards.
If any of those are not properly seated or damaged the remote will not power on.
Regards,
JM
Good luck and good repair.