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Do dead/stuck pixels occur over time?

Discussion in 'Projectors, Screens & Video Processors' started by ziglar, Jan 31, 2005.

  1. ziglar

    ziglar
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    I just took my HS10 out of storage - its been boxed up for 15mths - and noticed 3 or 4 odd looking pixels that weren't there before. One is a red pixel that seems to be lit all of the time except on black images.

    I thought that these defects were usually 'fabrication/manufacturing' problems and didn't suddenly appear? There is only 190hrs on it.

    Will this go away? or is it likely to be permanent?

    Thanks

    Stuart
     
  2. Reiner

    Reiner
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    Not sure if they occur over time (perhaps possible, say due to aging) but AFAIK the fault will remain for good and there is no way to fix it.
     
  3. spamboy

    spamboy
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    they can appear over time - aging, impacts etc. happened to me
     
  4. Tempest

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    Yes.......

    I ordered a nice new AE200 with a dead pixel check.

    All fine untill about 50 hours, then 1 read beacon (pixel) appeared over one side, then 10 hours later a second red one appeard near the opposite corner.

    Very annoying as they RUIN any dark scene.

    I'd much rather have dead black pixels, but bright red pixels are terrible as they stand out on anything other than really bright images.
     
  5. Muf

    Muf
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    I think there is something called pixel masking, this might black them out. I use DLP so I have no direct experience of the process. I think it might have been on AVS forums I saw it mentioned.

    Jim.
     
  6. Tempest

    Tempest
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    Thanks, but I've not found anything on this topic in google or on the AVS Forums.

    To be honest, for it to be masked means the LCD pixel has to CLOSE to block the red light. but it can't close as it's faulty in the 1st place!!!!!!

    Apart from sticking a black square on my screen I don't see how anything could work.

    I may try some black marker pen on a post-it note and cutting it to pixel size and sticking it there..........

    Or anyone know what other good colour (on the screen) could mask a stuck on red pixel ?
     
  7. LV426

    LV426
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    Sticking something on the screen is the right approach. The colour you need is the opposite of the errant pixel. The opposite of red, is green.
     
  8. drummerjohn

    drummerjohn
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    Have you tried to return it as faulty? Most manufacturers have a spec the projector must fulfill. That is.... a number of allowable dead pixels, a number of stuck on red pixels defined within a certain area, a number of stuck on green pixels defined within a certain area, a number of stuck on blue pixels within a certain area. Normally, the allowance for red is greater than blue because blue is brighter.

    Ask the retailer or Panasonic.
     
  9. Tempest

    Tempest
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    Last night I wrote an email to Discount Electrical explaining the situation roughly, that I accept my projector is just out of the 12 month warrenty but seeing as how it has had so little use before two red pixels appeared, if there was anything that could be done.
    I'm in no rush, so will see what they have to say in reply.

    I cut two tiny squares from a post it note tonight, coloured them black and stuck then over the red failed pixels.
    On dark/black scenes, you can't really see them much now unless you very close. But I have two black spots on white scenes, which is a pain, but not as bad as red spots on all the time.

    I'd tempted to upgrade to the new sony, but not sure how much mine would be worth now. less than 100 hours on the clock in low mode.
     
  10. ziglar

    ziglar
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    after another long time in the cupboard (the HS10 not me) I set up my HS10 and discovered that there is a large patch of yellow at the bottom right of the projected image which looks very much like a crazy paving crystal lattice.

    Although the machine is rather old it only has 214 hours on the lamp so I don't know if it is totally wrecked now.

    Do the LCD panels break up over time or can anyone else suggest what might be happening?

    Cheers,
    Stuart
     
  11. Clarner

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    As far as I know its the heat and UV that causes polarizers and panels to fail, and as you have only 214 hours on the PJ, I wouldn't jump to that as a cause. Also although a yellow tinge is common when polarizers begin to fail, I have not heard anyone mention the crazing pattern. Could the period spent in a cupboard have allowed some sort of mould to take hold somewhere in the PJs optics? As it is obviously out of warranty, I would be tempted to open it up and have a look inside or send it to a repair specialist for a quote.
     

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