[General Maximus]

so if there is nothing wrong with the power levels and somebody's tv picture is breaking up how do you investigate then?

I cant be bothered to find the thread now but somebody replied to one this morning and said that something like a hdu had been fitted which was masking the problem but there was a faulty amp in the cabinet and they were going to see how many customers it affected before they replaced it. Without an engineer going round to that persons house to investigate they wouldn't have picked up on that.