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my tv is getting darker and darker

Discussion in 'All other topics' started by Phyco_Can, Oct 21, 2006.

  1. Phyco_Can

    Phyco_Can Guest

    ok i have an rca and over thapast 3 years that ive had it the picture is getting darker and darker, i think its just time for it to be replaced, but in the meantime is there anything that i can do to help with the darkness? at the moment i am watching doom, and i cant see anything but some of the characters teeth, lol any help would be great.

    ,phyco
     
  2. Sniping_G

    Sniping_G Regular member

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    did u try to change the brightness and those options?
     
  3. Phyco_Can

    Phyco_Can Guest

    yep, its maxed out
     
  4. Sniping_G

    Sniping_G Regular member

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    ohh ic, lol get a new tv or get or repaired
     
  5. Cinch

    Cinch Regular member

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    How old and what kind of TV is it?

    It sounds like your picture tube is deteriating.
     
  6. Sniping_G

    Sniping_G Regular member

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    How old and what kind of TV is it?

    I dont think in three years this would happen it would take atleach 10+ so its the manufactures fault
     
  7. gerry1

    gerry1 Guest

    Is it possible that you've put unshielded speakers too close to the TV? If they're very close, it will change the colors at the point nearest the speaker but if a little further away, it could still be damaging your picture tube with no tell tale signs on the screen. Three years is way too soon for a picture tube to start losing it, especially a workhorse like RCAs.
     
  8. ireland

    ireland Active member

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    A TV or monitor with a picture that is too dark may have a fault or the CRT may
    just be near the end of its useful life.

    First, confirm that your video source - computer, camera, etc. - is producing
    a proper signal.

    Is the brightness at all erratic? Does whacking the monitor have any effect?
    If so, then you may have bad connections on the CRT driver card or elsewhere.
    If the brightness tends to fade in and out over a 10 to 20 second period,
    a bad filament connection is likely. Check for the normal orange glow of
    the filaments in the neck of the CRT. There should be 3 orange glows. If
    they are excessively reddish, very dim, or fade in and out, you have located
    a problem. See the section: "Picture fades in and out".

    Common causes of brightness problems:

    0. Dirty CRT faceplate or safety glass. Don't laugh. It sounds obvious, but
    have you tried cleaning the screen with suitable screen cleaner? It is
    amazing how dirty screens can get after a few years - especially around
    smokers!

    Wipe gently with a slightly dampened cloth - not soaking or you may end
    up with real problems when the water drips down inside and hits the
    electronics! On TVs with a separate protective faceplate, clean both
    the front and rear surfaces of this plate as well as the CRT itself.

    1. Old CRT. The brightness of the CRT deteriorates with on-time. It does not
    matter much how bright your run your TV. An indication of a weak CRT would
    be that turning up the SCREEN (G2) or master brightness control only results
    in a not terribly bright gray raster before the retrace lines show up.
    There may be indications of poor focus and silvery highlights as well. A
    CRT brightener may help. See the section: "Brightening an old CRT".

    2. Bad component in filament circuit or bad connection reducing filament
    voltage. This should be easy to check - there are only a few parts
    involved. If it is erratic, bad connections are likely.

    3. Brightness control faulty - bad pot, bad connections, or problem with its
    power supply. Depending on specific problem, control may or may not have
    any effect. If digitally adjusted, there could be a problem with the
    logic or control chip. If the button or menu item has no effect at all,
    then a logic or control problem is likely.

    4. Improperly set SCREEN (G2) voltage (usually on flyback) or faulty divider
    network. See the section: "Adjustment of the internal SCREEN and color controls".

    5. Improperly set video bias (background) levels or fault in video drive
    circuitry. See the sections starting with: "Optimal procedure for setting brightness/background and screen adjustments".

    6. Fault in video amplifiers. With all three color affected equally, this
    would most likely be a power supply problem. A video amplifier problem
    is likely if turning up the SCREEN (G2) or master brightenss control
    results in a very bright raster before the retrace lines appear. Cheack
    signals out of the video/chroma(IC.

    7. Fault in beam or brightness limiter. Many TVs and monitors measure the
    beam current (possibly indirectly) and limit the maximum to a safe value.
    The purpose of this may be to protect the CRT phosphors, and/or to assure
    that the power supply does not go out of regulation, and/or to limit X-ray
    emission. If this circuit screws up, a dark picture may result. Checking
    the signals and voltages at the CRT socket should determine if this is the
    problem.

    8. High voltage is low. However, this would likely result in other symptoms
    as well with focus, size, and geometry




    Try a CRT brightener from MCM Electronics about $20. It boosts the
    filament voltage a volt or two. I have used them before and they help.
    You can also try running a power supply on the filament with the
    monitor OFF. Set the supply at the filament voltage and slowly bring
    the voltage up. If the filament is 6.3 volt bring it up gradually to
    10 -12 volts for about a half hour. This will brighten it up some.
    Be careful because too much voltage can open the filament !

    Before doing this did you check the screen voltage setting and the
    RGB settings for drive and background ?

    There are also commercial CRT rejuvenators that supposedly zap the
    cathodes of the electron guns. A TV repair shop may be able to
    provide this service, though it is, at best, a short term fix.
     
    Last edited: Oct 22, 2006
  9. Cinch

    Cinch Regular member

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    @sniping G

    He said over the last three years... that does not mean the TV is only three years old. His phrasing leads me to believe he has had it longer and for the past three years its performance has been declining.

    Saying rca tells me nothing if you don't know how old or what model/screen size etc.
     
  10. larrylje

    larrylje Active member

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    Did you try picking it up and shaking it?

    That way the Fire Flies will get irritated and glow brighter.
     
  11. ireland

    ireland Active member

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    time for a late dinner,who wants a can of WORM-E-0'S

    I have a couple extra cans.....................

    [​IMG]
     
    Last edited: Oct 22, 2006
  12. gerry1

    gerry1 Guest

    @Ireland...you need to find better dollar stores LOL! By the way, avoid dollar store toilet paper; those little bits of unprocessed wood are killers!
     
  13. ireland

    ireland Active member

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    gerry1,after eating the worms for dinner
    ME.........
    [​IMG]

    who wants a hot worm dinner?..
     
  14. Phyco_Can

    Phyco_Can Guest

    @cinch just clarifying the fact that it is 3 years old ,as in its been out of the box for three years, and @gerry1 it i had two unsheilded speakers on each side of the television and ive just recently moved those so mabe that will help , i guess ill have to wait and see.
     

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