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Since when you started facing this problem ? Do you see any physical damage in it ?
Try using a different cables.I would suggest that red,white and yellow colour coded RF cable is still the best.(yellow for Pictuer,White for sound and red also for sound(surround).
If different combination doesn't works then you can try with someone else's cable and see if it is working or else use your cables in some other working DVD and see if works.
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What did not work. Interchanging cables or your cables didn't work on other's DVD ?
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