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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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Problem with turning on monitor
I have this bizarre power issue with my ViewSonic 21PS (CRT) monitor.
When attempting to turn ON the monitor the green indicator would turn ON for 2 seconds and then go OFF, without powering up the kinescope. So then I again try to turn the monitor on, so again the green indicator would come ON for 2 seconds, and then go OFF without powering up the kinescope. The bizarre part is that usually after that two attempts, if I try to turn ON the monitor once more, it works as intended. The green indicator comes on, the monitor degauss, then starts to display, and everything works perfectly. That is to next day that I have to turn it back on, and the procedure repeats. Once the monitor is ON, it does what it suppose to do. When I don't use it for a while, it goes to standby mode and then it comes back without problems from the standby mode. There are no problems with the quality of the displayed image, or anything. It is just this bizarre issue with turning it ON each day. I thought that this problem might have been caused by graphic card, but even when the monitor is not connected to the computer (or when computer is OFF when turning on the monitor) same issue occurs. Has anyone experience similar behavior with any of the ViewSonic CRT monitors, or any other monitor for that manner? Or perhaps someone could shade some light as with why such bazaar behavior might occur when turning ON the monitor? Any inside to this manner is greatly appreciated! |
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Problem with turning on monitor
If you are skilled at servicing monitors, check for high ESR caps in the
power supply and scan circuits. More than likely there are some caps that are starting to fail. Without an ESR meter, the only way to test the caps is to replace them one by one, until you weed out the defective ones. As they age they go off value, and also go high in ESR. In your case there are probably a number of critical caps that have become temperature sensitive. Delaying the repair, may lead to more serious failure. -- Greetings, Jerry Greenberg GLG Technologies GLG ============================================== WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm Instruments http://www.zoom-one.com/glgtech.htm ============================================== "Mike" wrote in message om... I have this bizarre power issue with my ViewSonic 21PS (CRT) monitor. When attempting to turn ON the monitor the green indicator would turn ON for 2 seconds and then go OFF, without powering up the kinescope. So then I again try to turn the monitor on, so again the green indicator would come ON for 2 seconds, and then go OFF without powering up the kinescope. The bizarre part is that usually after that two attempts, if I try to turn ON the monitor once more, it works as intended. The green indicator comes on, the monitor degauss, then starts to display, and everything works perfectly. That is to next day that I have to turn it back on, and the procedure repeats. Once the monitor is ON, it does what it suppose to do. When I don't use it for a while, it goes to standby mode and then it comes back without problems from the standby mode. There are no problems with the quality of the displayed image, or anything. It is just this bizarre issue with turning it ON each day. I thought that this problem might have been caused by graphic card, but even when the monitor is not connected to the computer (or when computer is OFF when turning on the monitor) same issue occurs. Has anyone experience similar behavior with any of the ViewSonic CRT monitors, or any other monitor for that manner? Or perhaps someone could shade some light as with why such bazaar behavior might occur when turning ON the monitor? Any inside to this manner is greatly appreciated! |
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