New 3ds XL won't turn on

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.