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LCD distortion diagnosis

V

vaca232

Weaksauce
Joined
Dec 21, 2006
Messages
96
Over the past few days my monitor has been having some really bad corruption and distortion. I’ve connected it to 2 other computers and it has the same result. Due to the DVI port on my video card being dead though, I haven’t been able to try out hooking it up through DVI, just VGA. I’ve also tried it under Ubuntu and one of the laptops has an Nvidia card in it, so it can’t be a driver issue.

It seems to distort more on areas with more contrasting colors, like black text on a white background is almost unreadable at times, but other areas of the screen are still perfectly clear, and the distortion moves if I move the window also.

Anyone have any idea’s whats going on, or if there’s any way to fix it? Or is the monitor on its way out?


taskman.jpg

corruption.jpg
 
vaca232 said:
I don't think it's the GPU. I've tried connecting the display to 2 laptops, and it has the same problem with both of them.
Click to expand...

Sorry, my reading comprehension is crap :)
Looks like its curtains for the LCD unless its under warranty or you feel like stripping it down to see if there is a bad connection or 2.
 
Nenu said:
Sorry, my reading comprehension is crap :)
Looks like its curtains for the LCD unless its under warranty or you feel like stripping it down to see if there is a bad connection or 2.
Click to expand...
I doubt its still under warranty, and it's a pretty cheapo monitor, so, its not so sad
 
sok0 said:
That definitely looks like a bad VGA cable.
Click to expand...

Please explain.

The distortion looks digital in nature, not analogue.
ie discreet pixels have their positions shifted in groups that are not uniform all over the display.
It doesnt look like analogue waveform distortion or a bad analogue connection.
 
Does it do it with all resolutions and scaling options, do you have anything to use on a different input (not VGA).
 
vick1000 said:
Does it do it with all resolutions and scaling options, do you have anything to use on a different input (not VGA).
Click to expand...

Unfortunately, the DVI ports on my GPU are dead, and both of the laptops in the house only have VGA ports. I need to see if I can borrow a friends laptop or something. It also isn't consistently happening, and the level of distortion varies. I was about to type that it's working fine right now, but it just changed its mind.

As for different resolutions, I let it sit at the Windows safe mode menu, before windows loaded, and it also had distortion issues there. I just switched from 1680x1050 to 1024x768 and it cleared up... if I switch back it gets distorted again..

Also, this is weird. If I drag the browser window to the right edge of the screen, so that the black background of the website is hitting the edge of the screen, as in the right little bit of the window is off the screen, then the display has corruption the height of the browser window across the entire width of the screen. When I move the window back completely onto the screen then the rest of the screen clears up
 
If you have a Best Buy near you, you can go buy a cheap video card to test with, and if it's not the problem just return the card and tell them you didn't like it. I think Wal-Mart even carries some video cards now, and they have a good return policy there.
 
Did you ever try DVI out on this monitor?

I suspect the analog-digital converter in the LCD that processes the VGA signal is starting to fail, at least until it warms up. There is a white flash when screen modes change too, accompanied by an audible click. I'm not sure what onboard component is actually failing, does anyone have any ideas what to check on the LCD mainboard if I wanted to fix this kind of problem?

In my case, I know my PC onboard graphics adapter had started going bad and was sending out bad analog signals (invalid mode, bad refresh rate, etc.) as the computer started to lock up, and because this happened so many times until I figured out it was a hardware problem and not a software driver one, it might have damaged the monitored.

I'm now on a separate video card to work around the original problem, but the monitor exhibits these problems even with a different cable and when connected to another computer. I'm going to try getting a video card with DVI out instead to save my monitor and prove it is in the analog VGA processing, but if it is a cheap electronic component like a capacitor, I'd like to fix the actual problem too.
 
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