: The standby LED should begin flashing rapidly, indicating the update is in progress. Do not turn off the power during this time.

If your TV still powers on but is stuck in standby or at the logo, try these steps:

: Locate the .bin or .img firmware file specifically for the TPD.NT72563.PB781 board.

: Professional repair forums like KenotronTV or Elforum are the best places to find verified "dumps" for these boards.