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How long do LCD panels last?

Discussion in 'LCD & LED LCD TVs Forum' started by Rob Sheep, May 21, 2005.

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  1. Rob Sheep

    Rob Sheep
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    Hi,
    Does any one out there have any facts or figures about how long an LCD panel should last?

    I'm considering one of the new Tosh -37" and I'd like to know if it will be around in 5 years. :lease:
     
  2. MikeK

    MikeK
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    They are quoting around 60000 hours for large direct view LCD panels (this in an average though, and it doesn't mean the rest of the TV itself will last this long). Even so, that's around 15years at 10hrs a day, so it shouldn't be too much of an issue getting the panel to last 5 yrs of average domestic use (unless you are very unlucky - even then you might have recourse to the manufacturer anyway).
    Also note that warranties don't cover every pixel on the panel, some pixels can fail and the panel will still be within manufacturer specs - each manufacturer may have a different policy here, so it may be wise to check this first!
     
  3. Rob Sheep

    Rob Sheep
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    Thanks.
     
  4. benwong

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    This figure is usually the time the manufacturer believes the screen will take to become half it's original brightness (fading of the back light tubes). It doesn't mean that in 60000 hours, the screen will die. It means that over the 60000 hours, the screen will gradually fade in brightness, and after ROUGHLY 60000 hours the screen will be half the original brightness.

    This means that, if all other components don't fail, the screen can be used for longer. ;)

    Ben
     
  5. Dr Pete

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    Also note that, for some Sharps at least, backlights can be replaced.

    I reckon the life if the screen is determined by your lust for the next latest and greatest display in the future! I'm pretty sure your not logging in on a 8086, 4mhz PC yet I'll bet most of those would still run if you dusted one off!
     
  6. LV426

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    Indeed. 60k hours is the backlight lifespan (quoted by Sharp). I don't recall seeing anywhere any indication of how long the actual LCD cell matrix lasts, or even whether it deteriorates over its lifespan. It might even be indefinite...... Odd pixel failure is pretty rare and AFAIK is most often caused by a failure of the individual transistor (on an IC) driving it - not by failure of the liquid crystal itself.
     
  7. jerkyboy

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    The half brightness thing refers to Plasmas not LCD's

    LCD's stay the same until the bulb goes, then you just buy a new bulb.

    My Sharp should last around 21 years at 8 hours a day, then I buy a new bulb for £70.
     
  8. la gran siete

    la gran siete
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    Does this mean the backlight can be replaced?
     
  9. LV426

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    Yes. On some models, by the user. On others, in a workshop.
     
  10. ianh64

    ianh64
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    But you need to replace all 16 (?) bulbs otherwise you will get a light band... but in 21 years time they will probably be €1.50 each.
     
  11. woody67

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    The lifespan quoted refers to the backlights.

    However, as the screen is actually a number of transistors, then the question to ask is how long does a transistor last? AFAIK, a lot longer than 60,000 hours
     
  12. jimsan

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    Sorry, Jerky, you're right and you're wrong! The measurement to half brightness is a plasma thing, but the bulbs do fade...a bit. So replacement wil be expensive as they will all need done.

    Hard to imagine this actually happening though. By the time a current LCD gets to the point that the backlights are failing I suspect that a replacement would be preferable...possibly even cheaper. So I think most failed backlight LCD's will head directly for the skip!

    Jimmy
     
  13. la gran siete

    la gran siete
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    Seems as LCDSs are a good buy then. Any idea which makes or models would habe their backlights more easily replaced or hoiw onme can find out?
     
  14. LV426

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    It isn't something I'd worry about. After several tens of thousands of hours' use, you'll be replacing the entire TV with a new one - perhaps of a different and better type yet to reach the stores.

    60,000 hours is about equal to seven years continuous use. Or, at 12 hours per day, 14 years......

    How to find out? I guess by looking at specs and/or asking the manufacturer/distributor.

    You should be aware of two things to watch for in LCDs when choosing a technology:

    1: They don't do black very well. It's dark grey. In other words, even dark parts of the image are slightly illuminated. Newer models are improving all the time, but it remains an issue. They are best watched with some ambient light - not in total darkness; this conceals this greyness to a degree.

    2: A fairly small proportion of screens have failed pixels in them, and most manufacturers have a production tolerance that is less than 100% perfect. So it may be that, if you get a set with one or two bright pinpricks on the image, you can't get redress as it's "within tolerance". These tolerances differ between manufacturers. You should try to buy from a store with
    - either, demo facilities so you can check your TV before you buy it
    - or, a good returns policy
    Pixel failure occurs most often in production; it rarely occurs in use, so, once you've got a pixel perfect one, it will probably stay that way.
     
  15. la gran siete

    la gran siete
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    Ok thanks.I''m thinking of one of the new Loewe Xelos at the moment the concept L32
     
  16. LV426

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    That's probably one of the (if not the) best examples. If I wanted a largish LCD, I'd certainly be examining this brand.
     
  17. la gran siete

    la gran siete
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    Many thanks Nigel :thumbsup:
     

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