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Are LCD's as vulnerable to EMI as CRT's? Less so? At all?

T

TrentSteel

Senior member
I recently picked up a new CRT monitor, but due to excessive EMI in the area, it can only operate at a 60 Hz refresh rate without getting shaking images, blurring and other visual disturbances.

The 60 Hz refresh rate gives me more of a headache than the distorted and dancing text and images at higher refresh rates, so I have decided to put an LCD monitor there in its place. But I have never owned any LCD monitors, only high-quality CRT's. My sources tell me the technology is slowly catching up, so I will probably be picking up something with an 8ms response time, which will hopefully be adequate for CS:S, WoW, and BF2.

I have spent an embarrassing amount of time getting this CRT to work in this particular area, and it's just not going to happen. Do I need to worry about having similar issues with an LCD monitor?

Thanks!
 
CRTs project electrons in the CRT's empty glass tube. These electrons get drawn away or closer by magnetic fields, that's your problem. Now with a LCD, the pixels aren created with electrons hitting the screen ; pixels are small color lights in a huge matrix. Thus, you won't have the same effect as you have with a CRT.

What's the source of the EMI? is it the computer itself, speakers, or something in the room? there are regulations to limit emissions of EMI by electronic devices...
 
An LCD with DVI should not have these issues. I had a similar (though seemingly less extreme) problem with a decent-quality 19" CRT, and the problem only went away when I got my current 21" LCD + DVI setup. For that matter, you shouldn't (in theory) have issues with an LCD on an analog connection, but I'd much rather have a DVI connection for crisper quality and [on my particular model of LCD] greatly reduced ghosting. 🙂
 
Thanks so much to both of you for the input. I would be using a DVI connector, so that makes me feel better. I didn't want to drop several hundred dollars on something that would give me the same trouble that I had already been experiencing.

Any other thoughts and comments are definitely appreciated, but for now it appears I will go ahead with the plan to take the plunge into the (active) matrix.

Again, thank you!

🙂
 
Originally posted by: PsYcHoCoW
CRTs project electrons in the CRT's empty glass tube. These electrons get drawn away or closer by magnetic fields, that's your problem. Now with a LCD, the pixels aren created with electrons hitting the screen ; pixels are small color lights in a huge matrix. Thus, you won't have the same effect as you have with a CRT.

What's the source of the EMI? is it the computer itself, speakers, or something in the room? there are regulations to limit emissions of EMI by electronic devices...
Click to expand...

Yes, I'd also like to know the source of this intense EM interference. Nuclear testing nearby, or other unique military weaponry? Do you live next to a substation?
 
I can't speak for the OP, but in my case, the only things nearby are a couple of train tracks a block away (plain old kind, not magnetic or high speed or anything), and a city garage where they fix stuff and keep all of the snow plowing trucks (I assume - I really don't know exactly what goes on in there). There isn't really anything unusual that I know of, but the wiring in this house is old and crappy. For what it's worth, I still had this problem even when I unplugged the computer and monitor from mains power and ran directly off the UPS. 😕

Oh well, at least with my Samsung 213T, my eyes are happy again. 😛
 
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