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This board converts power to the high voltage needed to light up the LEDs behind your screen.
Unplug and firmly reconnect your HDMI cables; sometimes the "driver" for that port just needs a fresh handshake.
The easiest way to update your TV is through the built-in settings menu while connected to the internet. The steps vary depending on your TV's operating system: Toshiba TV: How to Update
In the era of "Smart" integrated televisions, the concept of a TV requiring a driver often seems antiquated. However, for technicians, PC enthusiasts using a Toshiba TV as a monitor, or users trying to troubleshoot firmware issues, locating the correct "driver" is a critical step.
Replacing this requires opening the TV, which should only be done if you are comfortable with electronics. 2. Software: Firmware and "Drivers"