I honestly dont know. It's entirely analog - there's no provisions for a manual deguass. As for automatic deguass at power on I don't know either. The distortions caused by the offending emf(s) dissipate after they're removed from the equation, so maybe... although there isn't the typical "dwwwoinggg" sound at powerup that usually indicates an auto degauss...
my real problem is not deguassing, as I can do a manual with the ol soldering gun... my problem is, it seems this monitor's own magnetic directional field is so weak itself, such that the slightest emf from any source is enough to cause clouding, color distortions, etc. Keep in mind, when not bring interfered with, the picture is strong and color perfect. I'm not an elctronics guru by any means, just seems so Impossible that this monitor could have ever been used in arcade cabinets or in any application with speakers, transformers, cooling fans, other nearby equipment, etc... which leads me to believe there has to be some problem. I guess my neophyte theory would be, is there an adjustment to increase a monitor's own field to negate outside interference?
currenty, my machine is speakerless, dragged in the center of the man cave, away from wall wiring, outlets, other devices, and anything with a speaker has been dragged to the other side of the room 15 to 20 feet away. This is the only way I can keep the image clean. And no, I'm not exaggerating, it is really that bad\sensitive.