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Thanks for all the replies. Last weekend was bedlam at my place so I've just got back to this. I reckon it is the TV, something in the tuner. There is no meter in the TV so I tried removing the areal cable. As it got lose the picture came and went a bit. After the cable was removed the screen went black and a dialog box appeared saying 'Weak or absent signal'. Re-inserting the cable got the picture back. What I see when it fails is the picture freeze and the sound stop. The TV then will not respond to the remote and only an off/on at the wall restores it.
To me that sounds like it must be in the TV. And the reason I think it is the tuner is that DVDs seem to play OK. It went 2 hrs without fail and my wife (the movie watcher) thinks it's always OK on DVD.
In the size I need (ie what fits in the space I have) direct replacements are about $500 though a smart TV, which is what I'd get, is about $800. I think any repair would run to >$200, probably much more. I think I'm better off with a new one?
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