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Thanks Chuck, you've made a useful point. It's a small Panasonic TV used in a bedroom and is a good many years old - approximately cube shaped and measuring about 37cms each way. I cannot at the moment see a model number (it's too heavy to lift) but I'll do a bit more experimenting. I have two remote controls, the original one for analogue which can still be used for a few more weeks, and a new one for digital. The analogue remote will switch AV on an off but I haven't found how to do so with the digital remote, and don't see a button with a little i on it.