The backlight inverter section uses a boost converter topology to step up the 12V DC rail to the higher voltage required by the TV's LED strips (typically between 45V and 90V).
This often points to a failure in the SMPS section. The schematic helps you verify the 12V and 19V outputs. If these are missing, you’ll need to check the EMI filter, rectifier, and the main power IC (often labeled near EB1 or UB101). Tp.v56.pb801 Schematic Diagram Pdf
1x HDMI, 1x USB (Multimedia & Firmware), 1x VGA, 1x AV In, 1x PC Audio, 1x RF (Antenna), 1x Headphone Out 2. Structural Breakdown of the TP.V56.PB801 Circuit The backlight inverter section uses a boost converter