Thanks for your help.
The model number is LCD32TV022HD.
The tv just keeps on dropping the sound all the time and it varies on different channels. So while I might not be able to have sound on 1 channel, I can get it on a different one, but usually this is one that I don't want to watch.
It also stops and starts all the time, so while the program might start with sound, 2 minutes it the sound goes and then comes back a while later.
All highly frustrating as you can imagine.
Any help would be greatly appreciated.