Once the "Power ON" signal is received, the board generates 12V and 24V rails. Connectors:

The tab (heatsink) of the TO-252 package is often internally connected to Pin 2 (Drain/Collector) . Do not short this tab to ground!

Before assuming the Yp2632t is dead, perform these tests using a multimeter (diode mode).

The YP2632T board (also identified by part number 6871TPT316D) is typically housed in sets using the ML-051A chassis. It acts as the central hub, converting mains AC into the various DC voltages required for the main logic board and the CCFL (Cold Cathode Fluorescent Lamp) inverters.

Each provides 24V across pins 1-5 to power the screen backlight. Core Components in the Schematic

If the board is healthy, you should hear the relay click and see the voltage on the main capacitor rise to roughly 400V DC.