Generated by a DC-DC buck converter to power the main chip and USB ports.
Most issues with the TPV56PB801 stem from the power section. An exclusive look at the board layout reveals a multi-stage regulation process: Usually 12V DC. tpv56pb801 schematic diagram exclusive
While "exclusive" paper schematics are often proprietary to manufacturers like TP.VST, the cover 90% of the component layouts found on this board. Generated by a DC-DC buck converter to power
Measure the LED+ terminal at startup. If it jumps and then falls, the LEDs are likely burnt out. the LEDs are likely burnt out.