How many dead pixels do LCDs have?

Misiowiec

Misiowiec

Misiowiec

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Simple question really, but what is the risk (if I can call it that) for a new LCD to have dead pixels? At the moment I have an Iiyama 17" LCD which has no dead pixels, and I'm toying with the idea of getting a 20" widescreen Viewsonic VX2025. The biggest turnoff would be if the new screen had dead pixels, and if this would be below the treshhold at which the manufacturer swaps it. In Viewsonic case the policy is:

"If the monitor has a full dead pixel (black or white) then the unit will be swapped out. If the monitor has sub pixel failures (Red. Green or Blue) then you are allowed a max of 10 before the unit can be swapped out, this in compliance to the ISO 13046-2 Part 2, pretty much all the manufacturers adhere to this standard".

So, what's the risk that I'll be staring at a dead pixel and is it worth the risk?
 
superpc said:
Bit of a gamble really. Who knows until you open the box?
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That's what it seems like! Would I buy a car if it had a dent in it's bodywork, however small? Most likely not.

I don't know how bad a dead pixel really is to have (never had one), but I can imagine it would be very and a real dent in the bodywork.
 
Well I'm about to buy a TF and as far as i'm concerned its ridiculous to expect people to buy a monitor with *any* dead pixels.

Should mine arrive with dead pixels i'll be into complaining mode until Samsung give me a replacement! :D
 
Viewsonic do a 0 dead pixels policy dont they? Meaning if you have a black or white pixel the screen will be changed. They used to at least. However if you get some lazy pixels youll have to put up with it.
 
Dead pixels are quite annoying, but if you gripe about it most retailers will take it back and replace it to shut you up. Works for me every time.

Sale of goods act states that the device should be of merchantable quality. Which means it should do everythign it's supposed to, and properly.
Therefore technically if a monitors resolution is stated to be 1280x1024 every pixel in that range should work for it to fulfill that statement.
If not your well within your statautory rights to return it. In reality most people don't bother, but it can in cases of lazy pixels be a health and safety issue so so long as you stick to your guns and quote lots of law you'll get a replacement.

Never accept sub standard goods, it only makes the suppliers/manufacturers think they can get away with cutting corners. Which benefits no one. DO YOUR BIT, WHINGE!!
 
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I had a TFT with a stuck red pixel. I just sent it back under the 7 day long distance law! Thing is, if you RMA it to the manufacturer you are more than likely to get a 'refurbished' TFT back!! That is so unfair after paying for a 'new' one!
 
Well got my new NEC lcd2170nx from overclockers on saturday and im pleased to say there are 0 defects.

That makes me a happy bunny as dead pixels really XXXX me off :D
 
Great replies, thanks guys. In particular the Distance Selling Regulations with the 7 day cool-off period and the Sale of Goods Act might come in useful.

As many others I don't feel I should have to accept anything less then zero dead pixels.

Now let's go shopping :D
 
superpc said:
I had a TFT with a stuck red pixel. I just sent it back under the 7 day long distance law! Thing is, if you RMA it to the manufacturer you are more than likely to get a 'refurbished' TFT back!! That is so unfair after paying for a 'new' one!
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There's nothing wrong with a refurbished product. if there are dead pixels to refurbish they'll just replace the panel so what you have is just as good as a new monitor. Most are turned on and QA tested anyway so you rarely get an unused monitor.
 
You need to consider that current LCD/TFT technology means that as it is a living liquid crystal @ anytime pixels can either fail or become lazy due to the constant changing & electrical current switching on off when colours/contrast changes with each image.

Dell seem to be very good build quality wise & for shipping new replacements. Some people have RMAed 2405s several times until they got one which was perfect.

I and many others bought from OCUK and got 100% perfect 2405s straight out of the box.

This is pretty impressive as 1920x1200=2304000 pixels all perfect.

If you really cannot live with dead/lazy pixels you need to either get a CRT monitor or Plasma TV which has a high res PC input.
 
Short Review

2170nx unpacked from sealed box which I collected in person from overclockers :) . setup on arriving home, this panel has replaced my SONY HS95ps panel (My farther is now well happy) due to that panel being soooo slooow. on switching on I was glad to see that there were NO dead pixels (Sony had 1 sub blue). This monitor is megga bright so I have reduced the brightness from 100% to 50%, Backlighting is very even across the panel. A downside of this panel is there in no backlight adjustment or gamma settings.
Backlight bleed is very good, or should I say lack of it.

Gameing seems fine with no ghosting apparent to my eyes.

All in all ill give it 85%, would have been higher with a few more menu options.
Still a good purchase and im a happy bunny :p

Chris
 
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