I have a ps vita that has not been turned on since 2018 and i have tried all the methods that i can do and it wont turn on. i tried this one method that where you open up the vita and shortage the power button pins this method caused the PS button to turn blue but the screen didnt turn on like it did iin that persons video. (also my vita’s was left near a window so the screen is messed up) i dont know what to do anymore and if someone had the same thing happen to them please let me know how you fix it.
The one thing that first comes to mind is you have a dead digitizer (screen). After that i would say most likely a fuse. I hope you get this solved i got my first psv about a month ago and love it.