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It is a module--usually small--but not ALWAYS..that is between the panel and the signal board. ( occasionally...there will be a "line doubler board or such between it and the signal board--but not often). usually at top but i have seen them at the bottom.
Its purpose is to take the signals from the signal board and convert them into a format the various lines and columns of the panel can use. It CAN cause lines and /or distortion in the pix. Stands for "Timing and Control " board.
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