Kindle Paperwhite Died - Can't figure problem

Used a Kindle Paperwhite 3 from 2014 until a few weeks ago, it died while using,
Tried to charge it with socket connection

Tried to charge it with usb cable and a PC

Left it connected for days

Drained Battery tried to charge it again

Tried a soft reset (8 secs power button)

Tried a hard reset (40 secs power button)

Was pretty sure it was the battery then took it apart, no loose cables no swollen battery no signs of any damage or anything looking bad.

Checked battery with a multimeter seems good, checked the battery connection with a multimeter while connected to a power source also looks good.

No idea what else could it be.