gdgt

) This is accomplished via a coil around the perimeter of the CRT just behind the bezel. The coil is wired back usually to a small thermal regulator (typically a square, black, plastic, rectangular can) near the power relay. When you power the set up cold, the coil charges and degausses the screen until the thermal regulator heats up from the current flow and cuts it off. When the set is off, it cools and the cycle can repeat. The cooling time is why quick, multiple power cycles only yield one full-power degauss.

If you have the TV off or unplugged for 5-10 minutes and then power it up and the BUZZ-effect doesn't happen, the thermal regulator might be broken. This is a common problem in CRT sets. Sometimes they will short (which will present a nice little mushroom cloud and a blown fuse), or they will open, meaning the TV never degausses.

Many computer monitors had a manual trigger in their menus, but it was uncommon in TV's. It's possible it is in the service menu. Google "Service Menu" and the model number and see what turns up.

External degaussing is a possibility, but requires special equipment and there is a technique to it. Basically you'd have to bring it to a shop.

If you have a "hot spot" or discolored area of the screen, it is more likely to be a cracked or displaced ring magnet on the neck of the CRT. Multiple thermal cycles can cause the glue on these to crack, not to mention dropping or rough transport. Sometimes you can do a ghetto-repair for this by strategically taping refrigerator magnets in just the right spot on the exterior. Sometimes this just makes it worse.