Kite Super aio gone dark

[LifeAsASuffix]

I don’t know if this is the right forum but here’s my issue; I build a Super AIO GBZ about 1.5 years ago. I used a Pi3, Kite board, etc. Worked great. Logged plenty of hours. Went to turn it on after it sitting a while, and black screen. Screen seems to get power when turned on, Pi seems to be responding, activity light is going. I have tried reflashing the SD card, opened up the case and checked all the connectors, checked the battery. Everything I can think of. Now I turn to those smarter than me and ask; What next?