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I don't know much about PAL TV's, nor what could be causing your issue, but until you get an answer, maybe I can offer you a workaround solution: It'd be a kludge until you can get a better answer, but it might work:
If possible, use a VCR or something with a tuner and video output on it. Run the video through your TV, but run the audio through the VCR, and connect the VCR's audio outputs to an amplifier and speakers.
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