If your DVD/Blu-ray player is connected to the TV through an RCA cable (see the screenshot below), and the tv has sound but no picture, make sure that the pins are connected correctly on both ends, to the TV's RCA slot and the DVD/Blu-ray player. The yellow pin carries the video signal and should be plugged in the yellow ports on both ends (the TV and the player), whereas the red and white pins carry the audio signal (left and right speaker).
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