surface 4 dead after screen replacement

Hi,

I replaced my surface 4 pro broken screen and exausted battery. I followed ifixit guide and everything looked good. I accidentally damaged the video cable and the tablet was fully functional but without any backlight. I then replaced the video cable andeverything looked perfect….. for around 30 minutes. Then the monitor shut down while operating windows and it was impossible to boot it again.

Now I have a dead surface with no fan sound, no camera recognition light just keyboard light if I attach it and some slight electric noise when it’s on.

I’ve tried the procedures found online for the black screen of death without any success.

It’s strange cause it was working good, so cables and everything seemed fine…

Anyone has some clue?

Really, thanks for any help….

Mirko