Look for the AC to DC conversion at the entry point.
This is the most delicate part of the article. The internet is filled with sketchy "PDF download" sites that require you to disable your adblocker or enter a credit card—only to give you a useless document or malware. tpv56pb801 schematic diagram pdf
This section is a "Boost Converter" that steps up the 12V rail to the voltage required by the LED strips (typically 35V to 80V depending on the panel). Look for the AC to DC conversion at the entry point
This is marked clearly as the section of the circuit, separated from the secondary logic circuit by a thick physical isolation barrier on the board. TP.V56.PB801 Circuit and Datasheet | PDF - Scribd tpv56pb801 schematic diagram pdf