About pixel errors (LCD)

[Hobojobo]

Since this is a forum about video, I might send a couple of questions about pixel errors of LCDs.

Several days ago, I ordered a 17"-LCD (Samsung 710T) at an online shop.

Now I noticed that the panel has a permanent red (sub)pixel in the right top center.
On the inactiv desktop I can not spot the pixel.
But when I watch a video, the pixel is blinking at me.;)

I am still undetermined how annoying that is.

I could sent the LCD back, and get another one with 5 pixel errors. :(

There are fault classes which describes the quantity and quality of the pixel errors. But the interpretation of the manufacturers whether to replace a panel or not, differs quite a bit.

What is your experiences in this matter?
How many errors do you expect?
How many do you accept?

[cyberVera]

Manufacturers claim maximum 3 faulty pixels. The same for retailers, of course. I wouldn't accept even one, if it is so noticable and distracting.

[Doobie]

Chances are you'll get use to it and not even notice it anymore. You only notice now because you're trying to work yourself up to be annoyed.

Before LCDs were reasonably cheap, people wanting spend a little extra money for a flat screen would buy monitors with two lines going across the screen, Trinitron (http://www.sharpened.net/glossary/definition.php?trinitron). That's far worse than a few bad pixels, but people didn't mind because they didn't think of it as a defect.

You are right, if you exchange it, you might get a monitor with five bad pixels. Or, you might get one with another bad pixel and not notice it for a while, and when you eventually do, you'll be annoyed.

I'd avoid the high-risk hassle and just keep the monitor. Next time you buy a monitor, buy it locally and have it hooked up before you take it home, if you're not going to accept a bad pixel-or-two.

[int 21h]

You can sometimes massage stuck pixels back to life... this quote is from a forum where people take LCDs apart and build video projectors with them. Anyways, take or leave the instructions, many people there report good results though. YMMV, do at your own risk, etc.

The trick is not a trick at all. I call it a risky venture to try and fix a stuck or off pixel.

First, if the pixel is completely dead you are unlikely to fix it with this technique, as the transistor is unusable.

For pixels with sub pixel problems (mine ended up a sub pixel problem not a complete pixel.) Or, for those with stuck pixels in the red, green, blue, or bright white.

Warning! If you try this, it’s at your own risk; this technique has been known to actually cause more dead pixels if forced.

The technique is called pixel massage. What you do is find a very soft lens cloth and gently rub around the stuck pixel. In some cases the transistor has a bad connection and you can actually repair or help repair a stuck pixel with this technique. It seems to work best on stuck sub pixels or full on stuck pixels (red, green, blue).

Once again, do this at your own risk, if you press very hard you could damage the LCD. If you don’t press hard enough you may have no effect at all.

This does not work all the time, but has been known to be successful in bringing a pixel back to life.



You can read more about it by googling 'pixel massage'.

[Shinigami-Sama]

well if you do break it trying that say it got worse and have a dumb look on your face if you can return it localy if not send it back saying they started ot dry rather quckly

[Hobojobo]

I returned the LCD to the online shop within 14 days.
Hopefully I get my money soon.

I found a internet shop. They sell LCDs with a zero pixel fault guarantee for 20,- € extra.
I guess, that is a good deal.

Thanks for your input.