Beware of Dead Pixel when buying stuff with LCD display!

[pchan]

My brother bought a Dell Laptop and he discovered a green dead pixel on the LCD screen. Dell wouldn't let him exchange if it's less the 5 dead pixel. They told him to read their dead pixel spec at obscure corner of Dell website.

I bought a Canon digital camera and discovered a dead red pixel on the next day. Lucky, Harvey Narmon let me changed for a new one.

Here is PSP dead pixel issue....
http://www.1up.com/do/newsStory?cId=3139152

[jimmalenko]

That's pretty much standard across quite a few LCD manufacturers.

[Craig Tucker]

Standard but wrong. Luckily I have not been affected with any dead pixels with any LCD products I have bought. But If I did buy an LCD and it had a dead pixel, and the retailer would not exchange it I would be pissed

SCEA doesn't deny PSP machines may encounter these issues, but doesn't see it as a problem. "As with any LCD product on the market, a very small number of dark pixels or continuously lit pixels is normal for LCD screens, and is not a sign of a malfunction

Not a sign of a malfunction, what utter bollocks. Its a dead pixel, a pixel that does not work, a malfunctioning pixel.

[Hardcoreruss]

It is very common place. I was walking round Currys the other day (who ever buys from them anyway is mental) waiting for the missus who was looking round some tile shop (boring).

Well there was this couple at the service desk who had just bought a 4.5k plasma and it had a pixel stuck on red (not only can they be dead they can get stuck on a particular primary colour) right in the middle and Currys would not change it.

I have a total of 5 lcd's and 1 plasma and I have been very lucky not to have any dead pixels.

Some companies will take the item out of the box before they send it to you, check it and then forward it on. This is where I have bought all of mine from: -

www.av-sales.co.uk

They may be slightly more expensive but they will do deals and their customer service is flawless. I use either them (based in Kent I think) and www.avland.co.uk who are based in Northampton.

[Cole]

I was walking round Currys the other day (who ever buys from them anyway is mental)

I bought a Kettle from them last month. I hope that doesn't count!

I have owned two LCD screens and have not had any pixel issues - a brightness issue problem though, but that can happen to CRTs as well.

I previously understood that a LCD screen was not considered faulty if it had up to three dead pixels, but I agree with Craig - if a pixel doesn't work it is faulty.

I take this as an indication that LCD technology is not quite there yet.

[Hardcoreruss]

The number of pixels before it is faulty varies from company and is dependent on how close the dead pixels are to each other.

[waheed]

I was also unware about dead pixels when i bought my TFT monitor 2 years ago. Luckely, tehre were no dead pixels on my monitor.

A dot is a dead or faulty pixel. On an average LCD screen there are 778,240 pixels and behind each pixel is a transistor. When a transistor fails it can show as a bright, dark or coloured dot that stands out from the rest. It is common for a monitor to have several dead pixels and still be classified as fully functional.

TFT monitors are graded in Classes I to IV - which denote the number of failed transistors on screen at any time.

Monitors fall into four classifications:

Class I is for Military, Hospital or other Critical applications
Class II is the common class for consumer equipment.
Class II specifies Allowable defect; Allowable missing pixels per million pixels on display.

Not sure what class 3 and 4 are for.

Class I monitors are without allowable defect and are used for military, Hospital or other Critical applications - Class II is the common class for consumer equipment.

[MackemX]

I've seen it as hardcoreruss mentions where it's dead pixels per square whatever? So that means you can have so many dotted around the screen (up to a certain amount of course) as long as they are not together

I've seen Samsung are offering a 'no dead pixel' policy on certain screens

http://www.cnet.com.au/mobilecomputing/0,39028703,40004163,00.htm

I've only ever came across one dead pixel but I got discount anyway on an already heavily discounted price 8)

p.s. whoever buys from Currys/Dixons etc needs their head examining unless they are getting a cheap bargain

[flaninacupboard]

and www.avland.co.uk who are based in Northampton.

Actually they're in wellingborough, about ten minutes away from me.

Strange place, the door is always locked, you have to be buzzed in by the staff. good website though, always a proper list of connectors on the kit they sell.

[zzyzzx]

I'd check it in the store first, even if it ment buying a demo model TV.

[shelbyGT]

I think it's crap they (any company) says there has to be a certain number or limit that has to be reached before they will replace it. What crap! You buy something expecting it to work from the factory and be as perfect as it can be.

[spiderman2k1]

PSP is having allot of dead pixel problems now. And Sony does not carry warranties on dead pixels. So if you get one get one with a warranty, and when you have to bring it back say there is some thing wrong with the drive not playing games.

[yoda313]

Hello,

Hmmm... So I guess there's still room for CRT in this high tech world

Kevin

[MackemX]

Hello,

Hmmm... So I guess there's still room for CRT in this high tech world

Kevin

can you not get dead pixels on a CRT?

I thought they had pixels

[yoda313]

Hello,

Yeah but I've never had one and I've had four or five different monitors (or more). Each one seemed to be just fine with heavy to moderate use.

Kevin

[waheed]

Not to mention, CRTs offer better resolutions and better picture quality for monitors.

[jimmalenko]

can you not get dead pixels on a CRT?

I thought they had pixels

I think you'll find that CRT use a tube (1 for the whole screen), whereas LCDs use many small LCDs (each pixel is 1 LCD AFAIK). That's why they generally have minimums for judging a defective screen.

[jackal70058]

I'll have to keep this in mind when buying laptop computer.
But it no use if Dell won't let me change it for another if it's defective.

I'll just have to live with it. A pixel pretty small, proaly won't even notice it.

[ChrisX]

No dead pixels on my laptop screen and nothing seen on another, the LCD monitor.

I must be lucky.

[EddyH]

I don't get it, I never heard of this problem until about 2 years ago when really high rez screens started appearing.

I've had a couple of old VGA rez colour laptops and their screens are perfect.

Got this here 19", 1280x1024 LCD (so that's about 9 million transistors, thereabouts), and it's got just the one pixel whose red element is jammed on. It's a tiny, barely visible annoyance, but if it was shop bought i would have taken it back..... as it happens, i got it through family for about 1/3 the regular price, so ain't complainin'

The PSP only has a 320x240 display though, doesn't it? A quarter of the size of those old laptops (both were TFT, too!). To have any of those screens passing QC with even the one faulty element, from a big company like Sony, is just ludicrous.

[drewzor]

My GF bought a PSP three days ago and it already has a FAT dead pixel just off center of screen. The mofo's say that its not classed as a fault? then what is it? define what exactly is an lcd screen that doesnt display and image 100%...

IT"S ROOTED thats what it is and SHOULD be replaced!

Has anyone successfully exchaged a faulty psp?
Or will I have to nuke the data terminals with my 1amp 12v adaptor and send it back for replacement....

[thecoalman]

I seen a post by ROF where he mentioned "massaging" the pixels back to life. Those were his exact words, if you do a search you'll find it easy.

[drewzor]

ahh I see, I'll give that a try..
Here is the post about that:
https://forum.videohelp.com/viewtopic.php?t=306499&highlight=pixel

[RottenFoxBreath]

yeh i tried that months ago,with my kids 17" tft,and it worked quite well...took a few times to do it for good though,as every reboot would reset them to red..but after a few times,theyve stayed working.
have a friend with a new 40" samsung lcd,and its filled with hung pixels,but no massaging there..the whole display goes funny when you rub them,with a duster.
picture quality on that tv is rubbish,the xbox 360 looks like the text is running(like paint on paper)..but he doesnt listen,so its not going back...idiot.

[Super Warrior]

My 2006 dell laptop was the cheapest model available on dell's site. No dead pixels here, THANKFULLY.



(14" LCD screen btw)

[Super Warrior]

Has anyone successfully exchaged a faulty psp?
Or will I have to nuke the data terminals with my 1amp 12v adaptor and send it back for replacement....

Heh might as well. As expensive as PSPs are, you deserve to have one thats working 100% properly.

[RottenFoxBreath]

Super[/url] Warrior]

Has anyone successfully exchaged a faulty psp?
Or will I have to nuke the data terminals with my 1amp 12v adaptor and send it back for replacement....

Heh might as well. As expensive as PSPs are, you deserve to have one thats working 100% properly.

if in doubt..short it out.!!

[Poppa_Meth]

I was at Best Buy yesterday talking to them about LCD policy. Evidently if you discover it withing a week then they'll exchange it no questions asked.

[Craig Tucker]

I got a pixel to recover after rubbing the screen the other day, good tip.

[Super Warrior]

I wonder if the odd rubb-trick can be done with the PSP....

Funny, i mean how does that work? How can you "massage/rub" a pixel back to life????