I've got an 8-10 yr old 27" Panny CRT on which the whole screen started showing a bulls-eye pattern of green in the middle, surrounded by blue, surrounded by red. Had no idea what was going on, but for yucks, borrowed a de-gausser, which fixed the problem. I was a little surprised, since any previous time I've seen a CRT exposed to a magnetic field, the screen always showed a color gradient from the part of the screen that had been exposed (not a circular pattern). Anyways, a couple days later, the problem returned, again fixed by the de-gausser. The weird thing is there is no obvious source of magnetism this set has been exposed to, and it's in the same place/surroundings it's been in since it was purchased years ago. I'm wondering if something internal in the set is on it's way out, that just coincidentally happens to be temporarily fixed by the de-gausser. Anyone have any other thoughts? Thanks.

Ross

Anyone have any other thoughts? Thanks.


The thermal switch inside the TV, that controls the degaussing coil, sounds faulty. It's leaking, causing the degaussing coil to magnetise parts of the set, or disrupt normal operation.

The thermal switch inside the TV, that controls the degaussing coil, sounds faulty. It's leaking, causing the degaussing coil to magnetise parts of the set, or disrupt normal operation.

Very interesting Targus, thanks; had no idea such a thing existed. I'm guessing that given the age of the set, I'm better off just buying a new set than paying someone to confirm your diagnosis/repair it?

Ross

You could just disconnect it, since you already have an external coil.

You could just disconnect it, since you already have an external coil.

I wish, but the de-gaussing coil was a loaner from a local repair shop - they're not going to let me keep borrowing it indefinitely. I wouldn't know what the thermal switch looks like, let alone how to disconnect it.

Ross