Question about ViewSonic VA712B 17" Flat Panel LCD Monitor
I am an experienced hardware engineer, working on DTV projects for the last 7 years. I have a 17" LCD monitor Viewsonic VA712b (Model number VS10901, S/N PX7062700927), which I purchased in California several years ago (the warranty is not valid any more). Since yesterday the display disappears within about 5-10 seconds. Playing with the VGA cable does not recover the display. The display appears when I reset the PC and by toggling the monitor state to STBY and back to ON. In both cases it disappears after short time. I verified that this is a monitor issue, as it happends when the monitor is driven by either my PC or my laptop. I also disconnected the AC input to the monitor for 2 hours, but the problem was still there when I turned it on again. 1. Can you identify the problem by the above description and suggest a solution? 2. If not, please provide me with instructions for openning the cover so that I can access the electronic boards and maybe identify bad solder or damaged part. Thanks, Dov Porat.
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Posted on Jan 02, 2017
Blinking on and off is not always a capacitor issue, it is usually caused by faulty transistors at the high output transformers that light the backlights. Crappy board design ! But fixable in most cases.
Posted on Aug 10, 2008
SOURCE: Viewsonic VX724 LCD Monitor
I contacted ViewSonic and they agreed to fix the problem as a warranty repair. Evidentially they're experiencing the same issue on many of these monitors. I had to pay for shipping to their Walnut, CA facility, they'll fix it and pay return shipping. Since it is considered a warranty repair, I think they should've paid for a round trip ticket. I don't want to sound like a cheapskate but it is a warranty repair and the shipping charge was $98.00. Ouch! Cheaper than a new monitor I spose, so I'm thankful for that. So those of you with this problem might consider contacting ViewSonic to see if they will repair this on a recall "like" basis if your warranty is up. If it isn't up yet, by all means send it back to them and make them fix it!
Posted on Sep 12, 2008
Hi; I had the same problem. I know that sometimes devices require you to perform some type of '10-30 second' "hold" of one or some of its buttons in order to 'reset' the device, so to speak. So, having said that, try this:
1) Turn your monitor off (no green light) but leave it plugged in.
2) Leave it off for about 10 seconds.
3) Hold the  button on your monitor (the one to the immediate LEFT of your monitor's POWER button).
4) While holding the  button, now press and HOLD your POWER button.
5) Wait for your image to appear and STAY onscreen for about 5 seconds, then release both buttons.
6) Your monitor should retain its onscreen image.
Hope this helps! Good Day to all!
Posted on Dec 18, 2008
Tips for a great answer:
on Dec 07, 2009 | Chevrolet Camaro Cars & Trucks
Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Dec 24, 2010 | ViewSonic VA712B 17" Flat Panel LCD...
Basic LCD monitor troubleshooting guide:
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
Please post back what you find.
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