The Wannien 101V0 typically operates as a . It takes a high-voltage AC input and converts it into stable DC output voltages (commonly 12V and 5V) to power the logic board and backlight of a display.
https://github.com/johnelectron/smps_schematics/blob/main/Wannien_101V0_revA.pdf wannien 101v0 power supply schematic verified