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Because you guys as soooo clever a question please!

Discussion in 'Do It Yourself (Not Computer-Related)' started by muppy03, Mar 27, 2008.

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  1. muppy03

    muppy03 Thread Starter

    Joined:
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    First Name:
    Chris
    Just testing your knowledge here guys.

    I have an old TV here must be about 10 years maybe more. It works fine and dandy except for one small problem. Now I dont need it fixed but very curious as to why it does what it does.

    On one channel and one channel only, on certain commercials usually ones that are done in mainly black or white (writing, red bull ads etc) it makes a shocking static noise.

    The question is why does it only do it on one channel and why only on commercials?

    On another channel the same ads play fine.

    As I said I dont need a fix just very curious.

    Thanking you
     
  2. JohnWill

    JohnWill Retired Moderator

    Joined:
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    Messages:
    106,418
    Well, the snapping sound is probably a HV arc. I've seen sets do that when the picture changes suddenly, usually when they're pretty dirty and there's a place for the spark to jump. The 20-25KV anode voltage varies quite a lot with brightness changes, maybe for some reason the high contrast ads just push it over the edge. The first RX would be to simply blow the dust out of it.
     
  3. n2gun

    n2gun

    Joined:
    Mar 3, 2000
    Messages:
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    note of caution!! if you do decide to blow the dust out, even if the set is unplugged the 25,00 volts is still there.
     
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