I can't say I have any repair advice but one of my 20 year old pentalabs had the same problem a few months ago (lights normal but no sound). For some reason if I left them running the sound would magically appear from the dead speaker after about 20 minutes. It would then work perfectly and continue switching on/off ok providing the gap between use was not too long. Recently there have been no faults at all, they are working perfectly normally.

Out of interest both speakers developed faults after we moved house and moved them for the first time in 12 years. My dealer repaired them and said that the amps develop dry joints after a time which only affect their operation after the speakers are moved. That may be the same for you if the speakers had been stored elswhere for a time.

Best Wishes

I know what you mean. Maybe that's where the saying, "lights are on but no one is at home?"

It's so annoying that a simple problem is not so easily fixed?

Phil

Thanks for the advice. I'm sending it in next week so will include this in my todo list!

Thanks