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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Interesting behavior of CRT (image "blooming")
Just noticed something a bit strange about my CRT monitor (Dell-branded
Sony Trinitron), wondering if it means anything to anybody here. This only happens when it's first turned on, before it warms up much. I use Firefox as a browser and have it set to a little more than half the screen height, so the browser window takes up about half the screen. I use tabs, and I noticed when switching between a tab that's mostly black and one that's mostly white that when I do so, the entire screen "jumps out" a little. I hesitate to use the term "bloom", since I believe that has a specific meaning for certain CRT image artifacts, but that's what it seems to do. It's quite noticeable, and actually a little bit alarming. So I'm thinking: something having to do with AGC? Some kind of overcompensation for increased voltage levels for the brighter screen? The effect seems to completely disappear when the monitor is fully warmed up. Not a critical problem; I'm just curious. -- I am a Canadian who was born and raised in The Netherlands. I live on Planet Earth on a spot of land called Canada. We have noisy neighbours. - harvested from Usenet |
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