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=== I have a 34cm tv that worked perfectly ... But now it strays off channel all the time (it slowly gets fuzzy then just loses the channel altogether). It's ok with the 2 VHF channels in my area but anything UHF is buggered ===

Probably a faulty tuner. These are mostly generic and are available from WES Components for about $30.00. It probably has a dry joint in it. But they are just about impossible to repair. If you look inside one, you will know what I am talking about.