Weird Fault Viewsonic - Posted In Problem Solving


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Here you can post questions and get answers to help you solve problems with Windows based PC’s

We welcome your questions, with over 15 years experience with PC’s we might even find the answer for you.

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Weird Fault Viewsonic

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Offline Snowcrash Topic starter
England Global Moderator
Posts: 2689
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I got asked by my friend yesterday if I could help with his PC/network/internet problem.
His internet connection has been getting worse for months. He has gone down the usual ISP blame game issues. They have given him a new router and there was a signal to noise ratio issue with the line, now corrected. He still has intermittent net access ranging from 5Mbit to worse than dial up.
He has noticed that his WiFi works fine until he puts his PC on, then it goes to pot. With his PC off all is fine again. Put in a new network card, same issue. I pulled the PC apart and with the HDDs powered off and the graphics card out all worked fine. It was looking like an issue with one of these. Several hours and a day later of running with it due to the fault being more intermittent it turns out to be the monitor. With the PC on using the TV, Net connected and other monitor lead removed from PC and monitor all works fine until the monitor is powered on.
In conclusion, the monitor is giving off horrendous EMF and affecting the router causing net access to go through the floor. Very weird indeed. The last I heard he was heading to PC World to buy a new monitor. He hasn't called back so I assume all is well.
Has anyone ever come across anything like this?
Posted November 30, 2014, 20:22:54 PM
Last Edit: December 02, 2014, 16:54:53 PM by Snowcrash
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“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

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Offline Freddy
United Kingdom WWW Administrator
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Never come across or heard of anything like this before. Very odd.  scratch-head
Posted November 30, 2014, 21:08:43 PM Logged

Offline Data
United Kingdom Administrator
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Sounds like a really tricky thing to track down, 10 out of 10  thumbsup

Never heard of a monitor doing that, was it an old CRT ?

Only thing I have come across was a Taxi rank , had to go wired. 

Posted November 30, 2014, 22:30:17 PM Logged

Online DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

I can see an older CRT monitor doing that due to a bad capacitor in the horizontal output stage of the unit, but it's very rare. Usually, when those caps go bad, the top edge of the display looks "curled", or "folded", and the CRT will throw off a horrible, high-pitched whistle that's almost (but not quite) outside the range of human nearing. It's entirely possible that the same whistle isn't just sound, but EM radiation, too. That would tend to take out any wireless signals in the immediate vicinity, I would think.

Of course, if it's a more modern monitor, then your guess is as good as mine.
Posted November 30, 2014, 22:48:50 PM Logged
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Offline Snowcrash Topic starter
England Global Moderator
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It's a fairly modern 4:3 flat panel monitor.

Or rather it was a Viewsonic VX724. Have changed the header for searching.
Posted December 02, 2014, 16:54:31 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Online DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

Well, that shoots the "bad cap" scenario in the foot. Bugger me if I know, then. Sad
Posted December 02, 2014, 21:42:35 PM Logged
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Offline Data
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Your theory was sound Dave.  Smiley
Posted December 02, 2014, 22:02:06 PM Logged

Online DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

Here in the US, the Federal Communications Commission (FCC) has instituted a set of rules for electronic devices. FCC rules part 15b covers unintentional radiations of EM frequencies, and lays out strict parameters for these unintentional radiations, so as not to create disruptive interference. The monitor in question sounds like it would very likely exceed these parameters. I don't know if the UK has similar rules or laws in place (I suspect you do), but if you did, I would expect something similar.

Here's an idea! Try wrapping both the monitor and it's cables in tin foil, making sure that the foil is well grounded. Then try it again. If the foil prevents the interference, then you've 100% verified the source, and proved that those folks with the tin foil hats might be on to something! Cheesy
Posted December 02, 2014, 22:15:56 PM Logged
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Offline Data
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 rofl
Posted December 02, 2014, 22:27:36 PM Logged

Offline Snowcrash Topic starter
England Global Moderator
Posts: 2689
Rank: Certified

Have you got any transparent aluminium?

The monitor was fairly old and my mate didn't need much excuse to be allowed to buy a new widescreen monitor. Your bad cap idea might not be far off the mark though.



Not a great net presence for this guy. Needs to work on his presentation. I am really trying to be nice.
Posted December 03, 2014, 17:43:13 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson
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