Q: So theres this fine computer, works except one thing: Random monitor (CRT) will go black on the left / right sides for only a fraction of a second. It looks almost like a “clean” in a movie, but it is much more quickly. Its pretty annoying. My first guess was that the monitor was wont to go out because they do the same when using another monitor on the same system. I have not had a chance to try the monitor in question on a different system yet.
But on the real problem: the monitor is interference or other shape. Depending on the resolution and refresh rate, it varies in how much interference is noticeable. There is a constant flash, easily noticed when reading text. Its a bit like when you two poorly shielded CRT monitors too close. But Ive moved away EVERYTHING and nothing changes.
My guess is that there may be something in the system that is the cause of EMI is to the monitor output. The board has onboard video. I am thinking of trying a PCI video card, but Im not sure the board will let me disable the onboard video. It is a beautiful old Intel board.
Is possible that a bad connection impasse in the case or a snug non-appropriate I / O shield on the back, or something similar to this can be the problem?
Ill are swapping out anything that may result, but I want to make sure that it really is possible for the above two things is the problem the whole system before I rebuild the case.
Thanks for all the help, guys . This is something I do not know much about other than the base and can not seem to find much information through web searches.
Re:I had a whole row of offices that had intermitted EMI problems showing up on CRT screens – solution…replaced them all with LCD screens, problem solved.
Re:Originally posted by: guy
"My first guess was that the monitor was just going out, as it doesn't do the same thing when using another monitor on the same system."
Just curious… why are you thinking the problem lies in the case?
Try the monitor on another system and see what happens.
Because the monitor has been used on another system in the past and this problem just recently manifested in this newly rebuilt system.
And I tried another monitor on the same system and it also had some interference-like behavior… but not the 'black wipe' thing.
I can't get over to the system right now, but as soon as I get there I'm trying a PCI card and hopefully will figure something out.
Re:What you describe does not sound like any external interference. It wouldn't manifest itself as a "black wipe". That sounds like an internal component failing.
Re:"My first guess was that the monitor was just going out, as it doesn't do the same thing when using another monitor on the same system."
Just curious… why are you thinking the problem lies in the case?
Try the monitor on another system and see what happens.
Re:I'm inclined to agree that its the mobo/onboard video then, since you eliminated all else. SHove a pCI card in and post the result.
Re:Hopefully it's not the PSU. It's a Sparkle, and brand new, and seems to be working very well.
I am inclined to think it's the motherboard in some way. I'll be trying a PCI video card first and going from there.
I'm pretty sure the motherboard is properly mounted and grounded, but I will check for anything out of the ordinary.
I've tried different outlets in the house, as I wondered about the AC power quality. I tried it on a different electrical circuit and it did the same thing… the only thing left to try is going completely out of the house, but I don't think that is very high on my to-try list. I also did try another monitor, with the same problem, except for the black-wiping thing.
Re:Well, EMI can occur from a few different things. For one, it can be internals. It could be your PSU letting some noise in. It could also be your onboard video.
Also, be your AC line. First, the AC wiring can cause intererence in your Dsub 19 video cable going from the vid card to the moniter. Try a different cable here, macking sure it has ferromagnets (those buldges on the cord) to minimize noise there. It could be noise in your AC line going to your moniter.
As for a bad standoff, so long as the mobo is grounded properly, this shouldn't be it. If the board were resting against the case, it'd probably be fried by now.
Try a different cable, a different surge protector/power cable, and even a different moniter.
0 Comments.