Hi,I have a Sony Trinitron KV-20TS27 from 1991. After I turn it on and plug the TV Cable everything seems fine. After 1 minute it loses the signal and shows snow.Still there seems to be some weak signal on channels 69 or 88. I think this are some kind of local channels. When the TV Cable works, channel 69 shows something else while 88 has nothing.I think the TV is switching from TV Cable to local stations after 1 minute, but it does not switch back.Thanks,Ray
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