Sorry for the completely non-JW related topic, but...
My SONY Trinitron TV had a number of thin blue horizontal lines appear towards the top of the screen. I did some research and these appear to be "fly back lines" caused by the retrace showing as the gun moves back up the screen.
Rather than call an engineer, I decided to buy another TV on ebay. Get it home, plug it in and this one has exactly the same problem except red lines instead of blue.
I'm just wondering what are the chances of this happening??? The guy says it was fine at his end. I wonder if something like a bad mains power could be causing both TVs to malfunction?