AC200P Issue: Shuts Down After a Couple Seconds

Hello, I’m having issues with my AC200P. Here’s a video of its behaviour:
(YouTube Video Link)

It might be hard to tell, but the percentage readout is 100% when the screen is on for that couple seconds.

I’m wondering if anyone else has had this issue and if they were able to solve it. Some additional characteristics are:

  • The green light around the power button stays on.
  • I tested all the outputs and none of them output any power.
  • The behaviour does not change with the charger plugged in.
  • Might not be audible in the video, but the fan kicks on for a half second after pushing the button, but it remains off after that.
  • The behaviour doesn’t seem to match an over-discharged unit because the battery voltage is in the mid 50’s, while most people are saying the battery voltage is in the mid 30’s for the over-discharge problem.

This is a second hand unit and I don’t think there is any warranty on it, so any insight on what to check or how to fix would be greatly appreciated. Any additional information, please ask.