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Is my monitor going bad?

Or is there any way to fix it? (I hope!)



9:57 pm on Jul 28, 2005 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member

I've got a 19" flat-screen Mitsubishi Diamond Pro 900u monitor. Several times today, it's done something really odd where the display gets all dark, wavy and distorted with a few broad, very dark or black streaks going horizontally across the screen. The whole picture expands off the edges. The whole thing starts quickly but gently - fluidly, but fast. This lasts a few seconds, then everything goes back to normal. In a way it reminds me of degaussing, but it's doing this thing soundlessly except for a very small, barely audible "click" type noise. Degaussing this monitor, besides making a louder noise, makes the picture get smaller, toward the center, not larger and off the edges.

So the big question: is it going bad, or having a temporary fit, or just threatening to go bad but I could fix it if I try?

Has anyone else seen this, and if so, is there a way to correct it short of buying a new monitor?




10:15 pm on Jul 28, 2005 (gmt 0)

10+ Year Member

We had something like this and was card not monitor. Try putting video directly into motherboard video (remove video card) reboot and see if problem goes away. Easy check to see if card is the cause.


6:27 pm on Jul 29, 2005 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member

very dark or black streaks going horizontally

I've got a machine on my workbench that's doing that exact thing right now. The employee brought it to me for that very reason. He brought the machine, monitor and all. I plugged the machine in to another monitor and the same thing happened.

My guess is that your issue is the same; a bad video card. To confirm this, I'd plug your monitor into another computer / laptop and use it for a while to see if the same thing happens. If not, go with the video card.

If you replace your video card, it's smart to check with the documentation about your computer. You may have a few options with buying a card. You may have an AGP slot or you may have to install a PCI video card. Also, check to see if the slot is open. If your current video card is built in to the mother board, you'll most likely need to disable the card by setting a jumper on your mother board.

Since you have your case open for this, it would be a good time to check out your system fans. Make sure they are all in good order and if you can add any more, I'd say do it. Video cards can cook themselves in a hot machine because they usually have no fan to cool them. (Some newer cards do have them though.) Also, since the case is open, get out your canned air and blow out all of the dust. The dust forms a sort of "fur" on components and can raise their temperature significantly. All computers that I maintain have a set cleaning schedule as it can help extend the life of the equipment.

If the monitor really is bad, forget about fixing it. There are very few parts that an beginner / novice can replace inside.


6:36 pm on Jul 29, 2005 (gmt 0)

10+ Year Member

It could be internal arcing in the CRT, the LOPT (line output transformer) or EHT lead.

Rather than taking your monitor to a computer shop, see if you can find a local television shop or engineer to take a look. They send most of their time fixing faults like this.

The LOPT, CRT and EHT operate at 25,000 volts and above, and can store these voltages for several days, please do not be tempted to check them yourself!


6:46 pm on Jul 29, 2005 (gmt 0)

WebmasterWorld Senior Member 10+ Year Member

Thanks for the ideas, guys. That's a good suggestion to try plugging the monitor in to another computer; I'll definitely try that before doing anything drastic. My motherboard doesn't have video built in, just an AGP slot, so I can't really test the video card itself except by swapping out monitors.

The LOPT, CRT and EHT operate at 25,000 volts and above, and can store these voltages for several days, please do not be tempted to check them yourself!

LOL My dad knew a guy who was apprenticing in a TV repair shop back in the '60's. He'd always been told not to touch certain things inside, but when the owner was gone one afternoon, the guy took an old TV they'd had unplugged for several months, thinking it couldn't possibly have a charge left. He touched one of those parts with a screwdriver; I gather that the shock wasn't too bad, not life-threatening at least, but he nearly cracked his skull when he flew across the room and crashed against the opposite wall! ;)

I'll let you know how it goes. This happened 15-20 times yesterday, but so far today has only happened a few times. Hopefully it's the video card and not the monitor...

Thanks again for the advice, and please keep any further ideas coming!


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