iPhone 6 not turning on, full black screen
So, here's the thing. I have changed a logic board in my iPhone.
It didn't turned on, fine, i thought the battery was dead because it hadn't been turned on for half a year. I bought a battery, replaced it, put the phone on charge and voilá it turned on, everything seemed fine.
Some later, i put the phone into DFU mode to upgrade it, my computer didn't want to see the phone, i thought i need the original cable and that should be the problem, turned off the phone, disconnect the cable, new cable, back to the phone aaaand bootloop...
I disconnected the cable and then it always turned off immadiately, and after 1-2 times everything went black, since then nothing, no battery charging status, no DFU, no bootloop, just a black screen.
My think is that the battery is not original and has a problem, but I don't want to make stupid of myself in the shop if there is another problem.
Is this a good question?