PBP not booting screen blank after SD card boot

[Jakobp]

Hey there. I hope I can get a bit of inspiration for further problem shooting for my seemingly dead pbp. LEDs turn red then green(solid) as expected but screen doesn’t turn on at all. All worked perfectly until I wanted to test Manjaro i3 from SD card. I have Manjaro KDE  on eMmc installed already. Ok booted Manjaro i3 from SD card all worked fine. I updated this distro installed a few things from repository and built Vivaldi browser from AUR using Parmac. Then when rebooting I got the issue above. I thought there was something wrong with SD card and ejected and re booted only to see same issue with my installed system - nothing boots. I tried to charge in full then let it go completely flat in case of some endless sleep cycle ( this took about 20 hours). Any suggestions why the screen is just completely black? I know very little about things like gpu etc. so don’t know if any faulty hardware is preventing something to start screen? I’m really at a loss - I haven’t touched the hardware inside I have only flashed a card. SD card 32 gb and worked fine when I had Debian and Manjaro KDE on card. Any ideas??