The burned section of the PCB does indicate a problem, but I'm not sure that it's the problem that's causing the original complaint. When I first saw the CRT display, I noticed that it was irregularly pincushioned. Nothing was symmetrical about it, horizontally or vertically. If I'd seen this thing in the Tek Service Center, the first thing I'd've looked for was physical drop damage to the case. A nasty drop can screw up the internal scan-expansion mesh, a really fine, delicate screen (so fine that it holds water) that sits in the CRT's electron beam path to increase deflection sensitivity and reshape geometry for a more-linear and accurate screen display. By the way, this is a scope and not a television -- there are never any external magnets on the neck of a Tektronix CRT. Once you have any internal PCB problems resolved, you'll likely find that the original problem is still there.