Check the main fuse and the primary side of the power supply. Confirm the presence of 12V and 5V standby voltages.
Are you currently a specific fault on this board, such as a power failure or backlight issue ? TP.V56.PB801 Circuit and Datasheet | PDF - Scribd Tp.v56.pb801 Schematic Diagram
If you are performing a component-level repair (e.g., replacing a PWM controller or MOSFET), you can find the detailed circuit diagrams and firmware dumps on professional databases: TP.V56.PB801 Circuit and Datasheet | PDF - Scribd Check the main fuse and the primary side of the power supply