Hello, my CRT Monitor keeps going from light to darkish then back to light then back to darkish etc this can last for about 5 seconds every maybe 20min or so. Any idea what part of the CRT would be causing this kind of thing?
Probably the power supply -- is the image changing size ? Probably best NOT to try to fix this yourself.
Hi no the image is not changing size, just the light then darkish, I say darkish because it's not like it goes blank or anything just a bit darker.
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I hesitate to offer further suggestions because it can be very dangerous to try fixing CRTs without the correct knowledge and tools. It's a job for a professional and, given the high cost of labour and the low cost of new flatscreens and used CRTs these days, probably not worth it.