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Often, this board is paired with a separate mainboard (like an MStar or Realtek chipset that handles the HDMI inputs, USB media playback, and UI). The mainboard relies on the T-CON board (running this firmware) to accurately translate the video signal into something the physical screen can display.
Always try to back up your current EMMC dump if the TV still boots at all. 40-mt56s1-mae2lg Firmware