had same problem.contacted freeview.told to try all connections into box.although we had already tried this we tried again and the sound was restored.we were also told it could be a damaged scart lead or cable.i hope this is of some help
ken from newcastle
December 2011
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix dtt receivers.