Nokia G60 5G turn off and wont start again. :o

[Gerdi]

My Nokia G60 turned off by himself, about 2 weeks ago.
i was connected with bluetooth and was using google maps while watching youtube. It had about 80 or 60% Battery left, i tried charging the Phone for hours.
I recently replaced the Battery and tried to charge him, didnt worked so im kinda confused here. I think it could be the Motherboard maybe ? can i replace it by my own ?
Thanks for help :3

 

[B. Diddy]

At this point, it's probably best to take the phone to a repair shop and have them diagnose the issue. It may be hard to tell if there's a problem with the motherboard, or perhaps with your DIY battery replacement job, or something else.