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How Many Dead Pixels? What Projector?


I have one dead pixel on a sony 10HT.


This may help people make a projector decision, if they happen to be highly sensitive to dead pixels. Sony doesn't consider one or two dead pixels as a defect. Oh well.
 

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To my knowledge, no current presentation projector manufacture will guarantee that a projector will be defect free. Some will guarantee that a projector will contain less than a certain number of bad pixels. Some manufactures consider bad pixels close to the center of the image as a manufacturing defect that is covered under warranty. In some cases, the retailer will be more understanding of defects than the manufacture.


As such, the question of which projector model contains a given number or type of bad pixel is not as important as the policy of the manufacture and the retailer who sold the projector. Be sure to ask that question before and have it explained to your satisfaction before you purchase.
 

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Sony 10HT

No stuck on pixels.

One small dust blob. (Will try to remove during lamp change.)

Lamp timer displays "Please change lamp" since 1513 hours. Lamp now at ~1800 hours.


------------------

Rich Foye

Multiplex Technology
www.channelplus.com
 

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Quote:
Originally posted by JoeFloyd:
To my knowledge, no current presentation projector manufacture will guarantee that a projector will be defect free. Some will guarantee that a projector will contain less than a certain number of bad pixels. Some manufactures consider bad pixels close to the center of the image as a manufacturing defect that is covered under warranty. In some cases, the retailer will be more understanding of defects than the manufacture.
You seem to be unaware of the policy of a number of manufacturers regarding their DLP projectors. Several will replace units with even a single dead pixel, anywhere on the image. I know, I've had my Compaq MP1600 replaced in just such a situation. This is one of the pluses of DLP projectors over DILA and LCD.


I'm not sure which other DLP manufacturers have similar policies, but I know I've heard that some do. I also don't know whether this policy is backed in some way by TI or not, but I seem to recall hearing something about that. -- Herb
 

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Hi Herb,


You are quite lucky. The DLP replacement policy is quite ironic considering that the DLP chip yields are lower than LCD and D-ILA.


Compare the price of a 1500 lumen 3-chip DLP and a 1500 lumen 3-panel D-ILA to see what the low chip yields do to the cost of the projectors.
 

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Milori - I think the manufacturers and/or maybe TI can afford to have that policy because DMD's that make it through the manufacturing process just don't have bad pixels very often. Lots of people have gotten LCD's or DILA's with bad pixels. Very few people who have DLP's have ever seen one with a bad pixel. -- Herb
 

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I still cant believe any true videophile (even a DILA one) would overlook a pixel stuck "on".


------------------

Jeff

Currently - Zenith 7" CRT, 80x60 1.3 gain screen


Soon to be - 107x60 1.3 gain...with ?Seleco 250 with Panamorph or "cheap" 9" CRT
 

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Well, I'm not so lucky. Have one red/magenta stuck-on pixel left of center (halfway in between center screen and left screen edge). What strikes me as unusual is that this happened one morning out of the blue, after 150 hrs on my lamp. Prior to that, my G-11 had no dead or stuck-on pixels. Quite dissapointing to know that this may happen during the course of the entire life of the device, which I was not aware of. I thought you were fine for the rest of it if you had none of these suckers the first day you checked.


Anyway, due to the hi-res and the fact that my projector is calibrated for blacks, the pixel is only visible during outside bright-lit scenes, like whites/blues, at which point it really becomes noticeable and annoying. For most of the rest of the time, it is not visible.


Cheers,...or maybe not!


Luca


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PICTURES OF MY THEATER
albums.photopoint.com/j/AlbumIndex?u=1659592&a=12715694&f=0
 

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Greetings,

Sony 10 HT. One stuck "on" pixel at far right corner. Can't see it further than 2 or 3 feet on 92" Greyhawk Screen so, as far as I am concerned, it doesn't exist. No dust blobs. Tweaked per Munsil/Smallcome @ BigPic 10HT Forum. LOVE it !!!

Dom
 

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G11, one stuck on red pixel, 2 pixels in middle of the screen that show only on a blue screen, one red dust blob with green halo around it. I am going to send it in for repair which I I'm dreading.
 

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Sharp Xv-s55u:

no dead pixels, or stuck pixels, lots of dust and even a hair strand too!


However, only VGA, so alot less pixels to die than say a DILA...


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David Mendicino

Sharp xv-s55u (Don't laugh) :)
 

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G15 with one stuck on red pixel very close to the center. It drives me looney and I am going to have it serviced.


Cameron


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-- Well I have really blown my budget now. --
 

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Sony VPL400. When I got it new, approx 3 yrs ago, it had a cluster of dead pixels in the prime viewing area. Looked like a bright star shining in a black background. Sony replaced the entire prism block without argument. No dead pixels since.
 

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Originally posted by milori:

Hi Herb,


You are quite lucky. The DLP replacement policy is quite ironic considering that the DLP chip yields are lower than LCD and D-ILA.



Zero here too...DLP projector. But Herb, I'm not sure I understand....the yields are lower(but getting better)in part due to much stricter QA by TI.
 

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Quote:
Originally posted by Robster1958:

Zero here too...DLP projector. But Herb, I'm not sure I understand....the yields are lower(but getting better)in part due to much stricter QA by TI.
All I was suggesting that was that although DLP chip yields may be low, the manufacturing process for them might be one resulting in many chips that have zero defects (those that pass muster and are sold for use in projectors), lots of chips that have lots of defects (that will be trashed), and very few chips that have just a dead pixel or two.


So that the vast majority of chips that pass through quality control (those chips without major defects) are chips that have no dead pixels. Don't know whether that's the case or not, or whether TI is just committed to delivering chips with no dead pixels. That could be the reason yields are low, I supppose, but I tend to doubt it. -- Herb


 

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Factory-refurbished NEC VT-540, purchased from ABigPicture in February 2001.


ZERO dead/misfiring pixels.


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Scott Gammans
The Scooterplex Cinema 1
 
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