I have an Avtex 16 inch TV and while the picture is great I'm having problems with the sound - we can't hear it and it needs to be on 100% volume and even then we struggle. Recently it keeps flicking between DVD and TV all on its own. I believe its around 10 years old and rather than spend money on a repair would like to get a new one slightly larger. Avtex don't appear to make an 18inch anymore and their 19 inch is 3 cms too wide to fit in the Hymer TV box. The maximum width we have is 446cm. It needs to be 12 volt and have a built in DVD player. All the ones I can find are too wide - any suggestions?