The most possible scenario is that there is a dry joint somewhere between the video input female rca connector and the tv board's main signal processor, and a technician's assistance would be a good solution for the problem. Attached here below is a link to your tv model operation manual download. Please go through it and see if it works, if it fails, consider changing the entire main board.
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The most possible scenario is that there is a dry joint somewhere between the video input female rca connector and the tv board's main signal processor, and a technician's assistance would be a good solution for the problem. Attached here below is a link to your tv model operation manual download. Please go through it and see if it works, if it fails, consider changing the entire main board.
https://manualsbrain.com/en/manuals/796083/download/