Question about ViewSonic VA550 15" Flat Panel LCD Monitor
Confirmed I'm getting 12V, and there is a green LED inside on the video board that is lit. I'm not talking about the Power LED on the front. Pressing the power button does nothing. No sounds, no signs of any kind. No fishy or burnt smells, nothing physical that I can see. Cables all plugged in, and I went ahead and reseated them.
SOURCE: Monitor Continually Goes Blank
I had a similar problem with a Westinghouse 19" LCD. Had left power on
while running errands, but came home to a black screen. I could cycle
the power and see the desktop image but it would go black after 2-3
Out of curiosity, after cycling the power, I immediately pressed the monitor settings button, and was able to get into the menu . . ., no black out . . . I changed the brightness setting and crossed my fingers while I let the setting menu time out . . ., lo and behold, it's working again.
Perhaps Mark could comment as to why this might have worked.
. . . and yes, I do feel lucky . . .
Posted on Apr 23, 2008
It is impossible to see defective components visualy, unless there was a serious burn-up or something like that.
Without at least a DVM you cannot even verify if the power supply is functioning properly!!!
There is no support at the component level service for these monitors. The service tech will change the main input board to solve the fault that you have. If the back plane lamps are failed, he will change the power supply for the back plane lamps. In some of these models, the back plane lamps are not replaceable. This means that the screen would have to be replaced.
If you want to service the monitor the non supported way, call Viewsonic and see if they will sell you a copy of the detailed schematics, and engineering data for the boards. Most monitor companies will not sell any schematics or service information to no authorized contractors for their service.
If you can have the details, get a digital scope, a DVM, a logic analyser, and start troubleshooting according to the service manual. This can involve hours of work to figure out the fault. Then you will have the task of seeing if Viewsonic will sell any of their proprietory EPROM's or processor type parts.
This is why when the warranty is finished on these monitors, they are not worth to send back for service. The shipping cost, plus the parts and labour can come out to more than the monitor is worth!
Posted on May 19, 2008
Check the power cable. If it uses a power brick style assembly (like a laptop) it may need to be replaced. Some power bricks can break a wire at the base of the brick just enough that it causes a short in the system and shuts down the power flow.
Posted on Mar 19, 2009
SOURCE: ViewSonic Vx924 No power
If youcan take a picture or two of the boards in your system as close and clear as you can and go to our web page and email them to me I will check and see if we can help you find the problem.
Posted on Aug 14, 2009
You have one of two things wrong. One the new power supply board may be bad, we have seen quite a few power supply boards purchased on Ebay that are just as bad as the ones people are trying to replace. They send them to us for repair along with the original board and both have bad capacitors installed. Many of these boards are coming in from PC recyclers that are just striping monitors for parts and not rebuilding the boards before the sell them. Check the tops of the capacitors for bulges if you find any them the board is bad.
If the board is in fact good then the cause is bad florescent back light bulbs in the display panel. When the fail they pull to much current trying to light up and this trips the over current circuit in the power supply board which shuts the power supply down to prevent damage and this turns off the display. The bulbs can be d but this will be a very involved project. You can do a Google search for instruction on this process but keep in mind this bulbs are very fragile and thin, easy to break.
I hope this helps. If you have any questions just reply to this answer.
Posted on Aug 22, 2011
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