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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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Ultrascan monitor Dell P991
Hi,
This is a Sony Trinitron monitor which I like very much. Its performance is awesome, unfortunately it has begun giving me picture troubles. Maybe a year ago, I had to continously decrease screen brightness and contrast to compensate for the monitor's own increase of these parameters. Today I'm using brightness of zero and contrast of say about 20. This will give me a decent picture. If brightness and contrast are turned up, retrace lines are seen. Also, the screen when it should be all black, is more like purple. This gave me an idea of a too high G2 voltage. But I was amazed when trying to decrease G2 (on the HVT), this actually changed the focus! Of course, the focus pot changed the focus aswell. It seems like there is some short between G2 / focus circuits??? Any advice is appreciated. I'm an electronics engineer of switching power supplies so you don't need to give any advice like "bring it to a technician", I'm well into electronics. Regards PAF |
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