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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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Viewsonic P815 Intermittent off/on
This monitor goes off then comes right back on, after three years trouble
free. It degausses when it comes back on. Any help is appreciated, Thanks. |
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Viewsonic P815 Intermittent off/on
Thanks for the response Jerry,
I've had the monitor longer than three years. I'm past the stage of knowing enough to be dangerous far enough to make the repair. I was just hoping someone here had fixed a similar problem with this monitor. There is a slight snap sound, I can't pinpoint it but, I believe it to be, or close to, the tripler. No visible arcing that I can see. There are two components (s371+s671) that emit a blue spark close to each other and the tripler (I thought all manufacturers kept the # designations the same for each circuit, ie., 301, 302, 303, horizontal circuit ) . They are glass cased and very well could be doing this from a loss of power as apposed to going bad. I will keep observing and reading for now. Still looking for answers. "Jerry G." wrote in message ... This can be attributed to something failing in the power supply or scan circuits, causing a shutdown, and then a restart. This is not something you would be able to service yourself, unless properly equipped and trained. Send the monitor to the ViewSonic service rep for an estimate to evaluate if it is worth to service. I think there is a 3 year warranty on ViewSonic monitors. Check this out with them to know if your monitor is under warranty. -- 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 news:YNf%a.152397$Ho3.17219@sccrnsc03... This monitor goes off then comes right back on, after three years trouble free. It degausses when it comes back on. Any help is appreciated, Thanks. |
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Viewsonic P815 Intermittent off/on
Thanks David,
I hear Ya on the screen brightness. I wouldn't even bother but, this one is still very bright. I've found s371 (Spark Gap) to be the snapping sound culprit but I guess it's actually avoiding possibly more damage. Something is constantly ramping voltage, I believe s371 to be sparking once the voltage gets too high thus causing an endless cycle for now. The monitor finally quit. Now the power LED on the front flashes green @ about 1/2 second intervals.This coincides with the shorted part ramping up and the spark gap taking the voltage low. I found a short in the H.O.T. and I'm in the process of removing the main board now. I found a schematic on the net but, it's the wrong model, part #s are off but, I'm able to catch the jist of it. Well, I guess that's it for now. Thanks again, Mike "David" wrote in message ... 99% of all the P815,G810 Viewsonic monitors I see with a failure all have failing or bad flybacks. Since it is snapping, there is a very good chance the flyback is failing. Only $85 plus shipping. Unless it has seen little use and the picture tube tests very good, not worth fixing. I have seen way to many of them get fixed only to have a dim picture due to the hours of use on the tube. At least yours is still running some times so you can actually do some tests on the picture tube. David Mike wrote in message news:h4q%a.128882$Oz4.26280@rwcrnsc54... Thanks for the response Jerry, I've had the monitor longer than three years. I'm past the stage of knowing enough to be dangerous far enough to make the repair. I was just hoping someone here had fixed a similar problem with this monitor. There is a slight snap sound, I can't pinpoint it but, I believe it to be, or close to, the tripler. No visible arcing that I can see. There are two components (s371+s671) that emit a blue spark close to each other and the tripler (I thought all manufacturers kept the # designations the same for each circuit, ie., 301, 302, 303, horizontal circuit ) . They are glass cased and very well could be doing this from a loss of power as apposed to going bad. I will keep observing and reading for now. Still looking for answers. "Jerry G." wrote in message ... This can be attributed to something failing in the power supply or scan circuits, causing a shutdown, and then a restart. This is not something you would be able to service yourself, unless properly equipped and trained. Send the monitor to the ViewSonic service rep for an estimate to evaluate if it is worth to service. I think there is a 3 year warranty on ViewSonic monitors. Check this out with them to know if your monitor is under warranty. -- 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 news:YNf%a.152397$Ho3.17219@sccrnsc03... This monitor goes off then comes right back on, after three years trouble free. It degausses when it comes back on. Any help is appreciated, Thanks. |
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