Chosen Solution
I recently replaced the action buttons board on my 3ds xl due to a faulty A button. For a few days the 3ds worked fine. However, after I put the 3ds in sleep mode and charged it for a few hours, it turned off on its own and never turned back on. I tried a different battery but I still cannot turn the 3ds on. I can see the charging light when the 3ds is connected to a charger, but nothing happens when I press the power button. Any idea what could be causing the issue? Thank you.
Try a new flex ribbon for the abxy board or just connecting it again from both sides.
