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reliability of Pioneer plasma sets

Discussion in 'Electronic Repair' started by William Sommerwerck, Mar 22, 2009.

  1. Guest

    The stuff is usually just crushed and, maybe, if you're lucky, not treated
    as hazardous waste but indeed post-processed to recover some of the raw
    materials.
     
  2. Arfa Daily

    Arfa Daily Guest

    People keep mentioning car bulbs, but we are comparing apples and oranges
    here, based on the fact that they are both fruit.

    One of the reasons that a car bulb is slow to reach full output, is that the
    filament has to be made thick and robust for enhanced reliability and
    failure proofing from vibration. That makes it have substantial thermal
    inertia, so much so that you can indeed see it hot up. On the other hand,
    high voltage domestic lightbulbs have no such constraints on their
    filaments, as they are not going on and off all the time like a brake light
    or indicator, and are not subject to vibration in normal use. This results
    in the manufacturers being able to design them with a much more delicate
    filament, with the result that, to all intents and purposes, the ramp up to
    full output is 'instantaneous'.

    Arfa
     
  3. Arfa Daily

    Arfa Daily Guest

    All of which makes a mockery of the EU WEEE directive, treatment of
    hazardous wastes directives, and recycling in general ... Just a load more
    EU eco-bollox really !

    Arfa
     
  4. Arfa Daily

    Arfa Daily Guest

    Yes Jeff, I'm fully aware of all this eco-bollox nonsense with
    incandescents, but as far as I am aware, it doesn't affect halogens for
    which there are no direct replacements, at this point in time. The G9 bulb
    is about the size of a projector lamp or small headlamp bulb, and nothing
    else would fit in a socket intended for one. Many many ceiling light
    fittings this side of the pond are now 'decorative' design pieces as well as
    being functional, and these invariably use bulbs like the G9 or similar pea
    types in a halogen format, so unless they are going to render everyone's
    modern light fittings obsolete, including ones that are on sale right now, I
    can't see how they can ban this type of bulb.

    see

    http://www.focusdiy.co.uk/bin/venda...pellcorrect=1&datasource=focusen&setpagenum=2

    for some examples. (That URL might be a bit long to work correctly from
    here). The ones I have just bought are the "Dexter" model at the top.

    Arfa
     
  5. One of the reasons that a car bulb is slow to reach full output, is that
    the
    I don't like disagreeing with you, but this is incorrect. You can easily see
    the "ramp up" of household incandescent lights. It's about 1/10 of a second,
    and is plainly visible. Some CFLs are (at least visibly) "instantaneous".
     
  6. Arfa Daily

    Arfa Daily Guest

    Well, maybe the driving voltage does have something to do with it then. With
    double the line voltage here that you have there, I can honestly say that I
    cannot see any perceivable delay between flicking the switch, and having
    light. I have asked a number of people the question, and not one of them has
    said that they can either. Not that that is much of a scientific test, of
    course. Interestingly though, the ones that I said that I could see ramp up,
    are low voltage halogens. So I wonder if the fact that low voltage bulbs
    need amps through them, to get the same filament power as a line voltage
    bulb does with miliamps, dictates how robust the filament needs to be, and
    hence how much theremal inertia it has? I know that halogens run a hotter
    filament to get slightly brighter light, but you can also see the low
    voltage ones visibly cool as well, which would lend creedence to the theory
    that the filament is more robust.

    It is not a function of the fact that the bulbs are of a halogen type per
    se, as the fittings that I have just bought also use halogen bulbs, but
    unlike the fittings that they are replacing, which *were* low voltage (12v
    AC nominal), these are line voltage types. They definitely appear to come on
    pretty much 'instantaneously'.

    So, perhaps a US 110v bulb, does take twice as long to reach 'full' output,
    as a 240v one, and that is indeed enough to be able to see ?

    Arfa
     
  7. Arfa Daily

    Arfa Daily Guest

    But if the filament is of a more 'delicate' CSA, that might well give it
    less thermal inertia, leading to it heating quicker ? Based on what you are
    saying, there is no reason why a low voltage 50 watt car bulb, should heat
    any slower than a 50w 240v bulb, but obviously it does, as the ramp up time
    can be very clearly seen on them.

    Anybody over there got a photodiode, a storage 'scope, and the time to hook
    'em together to have a look at just how long the time delay is? Once that
    was known, I could do the same here to get a rough comparison.

    Arfa
     
  8. Eeyore

    Eeyore Guest

    Power consumption. I'd expect more problems to arise if you use the TV a lot.

    Graham
     
  9. Ken

    Ken Guest


    http://www.telegraph.co.uk/earth/42...ns-to-be-banned-under-new-EU-legislation.html

    http://www.treehugger.com/files/2009/01/energy-hog-plasma-tvs-getting-banned-from-eu.php
     
  10. b) production of plasma sets is to be ceased if it hasn't been
    lot.

    The Pioneer runs surprisingly cool. And it's well-ventilated.
     
  11. Eeyore

    Eeyore Guest

    That's an encouraging sign.

    Graham
     
  12. Arfa Daily

    Arfa Daily Guest

    I know what you mean. I think that the older you get, the less inclined you
    become to actually getting off your arse and doing these things ... I have a
    graphic LCD panel sitting here on the table by the side of me. There is a
    board that I built hooked to it, and I have a proper professional IDE /
    compiler installed on the computer. I found some routines on the net,
    imported them to the IDE and compiled them and loaded them up to the PIC. It
    sort of worked, but there is some issue with there being both a vertical and
    a horizontal 'echo'. Could be hardware. Could be software. And there it has
    sat for at least 2 years. I was really enthusiastic when I started on the
    project. Now, I can't even be fagged to look a bit deeper into the routines,
    to see if I can write a simple diagnostic to prove out the hardware. Very
    sad really. Actually, all I want to do right now, is jet off to sunny
    Florida, on holiday ... :)

    Arfa
     
  13. The Pioneer runs surprisingly cool. And it's well-ventilated.
    I was accustomed to standing close to plasma displays and feeling the heat
    come off them (on the back of my hand, anyway). The Pioneer had to run
    several hours to get noticeably warm, and it wasn't nearly as warm as other
    sets.
     
  14. Arfa Daily

    Arfa Daily Guest

    Hmmm. Interesting. I wonder if this has had any bearing on Pioneer's
    decision to quit the plasma market totally ? It is also interesting that the
    article cites LCD's as being much more energy efficient. Well yes, they are
    more efficient than plasmas, but nothing like as efficient as CRT sets had
    become. The backlighting of even a fairly modest sized LCD amounts to 80
    watts or so on its own, without the power consumed by the rest of the set. A
    large screen LCD uses over 100 watts to power just the backlights ...

    Perhaps this latest bit of green-mist legislation in the making, will
    finally kick start the involved parties into sorting out the legal wrangles
    to allow the truly efficient and superior display quality SED technology to
    gain a foothold as the de facto replacement for plasma.

    Arfa
     
  15. Arfa Daily

    Arfa Daily Guest

    Bright sunshine here at the moment, but I'd still rather be out your way !
    Had a severe weather warning on my Weather Channel desktop for Orlando
    Airport yesterday. Very heavy thunder and hail I think it said. Been a while
    since I saw a good storm. We're gonna try and get out some time in May.
    Based on previous visits at that sort of time, should be quite nice then ??

    Arfa
     
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