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repairing a tft monitor

Discussion in 'Electronic Repair' started by das, Aug 31, 2005.

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  1. das

    das Guest

    Hi all,

    Quick question, I've only just started learning electronics so you'll
    have to forgive my ignorance (although i'm a qualified computer
    engineer, I fancied learning a bit more).

    I've got a tft monitor that when plugged in doesnt switch on at all,
    the standby light is constantly on. What I have noticed is that in a
    working switch I have laying round (similar to the on switch on the
    tft) the switch only shorts when the button is pressed. However on the
    tft the button is always shorted.

    Does anyone have any idea if this is correct or have I hit upon the
    possible problem straight away!?


    Kind Regards
    Dale
     
  2. Mima

    Mima Guest

    Dude, You are an Ass Monkey!
     
  3. das

    das Guest

    thanks
     
  4. sofie

    sofie Guest

    Dale:
    Maybe.......
    remove the switch in the monitor and measure it again to make certain that
    the circuit it is connected to is not "shorted".... then, just for "fun"
    replace it with your "laying around" switch. This will confirm your
    diagnosis.
    --
    Best Regards,
    Daniel Sofie
    Electronics Supply & Repair
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    ..
    ..
    ..
     
  5. sofie

    sofie Guest

    Mima:
    "Dude"..... What in the hell is your problem? If you don't like the way he
    asked the question and don't like the fact that he is not as "technically
    advanced" as you are then please don't bother responding, especially with
    insults.
     
  6. das

    das Guest

    Thanks very much for your help Daniel, I've unsoldered the switch and
    it still measures as short, so im going to pop into maplin tommorrow
    and pick up a new one see if that helps. if not its only 20p down the
    drain anyway!? I'll let you know how I get on if you want.

    All the best
    Dale
     
  7. sofie

    sofie Guest

    Dale:
    YES.... post the results of you repair attempt.
     
  8. Could be...some circuits, by design, are activated when the momentary
    switch is released.

    Tom
     
  9. James Sweet

    James Sweet Guest

    Try simply momentarily shorting the pads on the PCB where the switch goes
    and see if it powers up. Are you sure you're measuring the correct pins on
    the switch and not the mounting frame?
     
  10. das

    das Guest

    Im measuring the legs of the switch, i've gone a bought another couple,
    (it would be rude to just buy one). I'll let you know how I get on
    Thanks everyone
     
  11. Mikey

    Mikey Guest

    And. Mima, you are a monkey's ass!
     
  12. das

    das Guest

    just had another quick look at it(i'll put the new switch on a bit
    later). But can someone explain to me something that i've just thought
    of.

    the tft power button is mounted onto a simple small pcb with nothing on
    it but the on/standby led and the power button and obviously a
    connector for the cables that then disappear off into the tft. But the
    button has only one track that goes on the pcb and obviously it flows
    off to the connector. As I said before I'm a bit of a dunce so far but
    I want to know how the power button will work if there is only one
    connection off one leg, surely it cannot open a circuit because that
    requires the switch to be connected at least two legs???!!!

    cheers
     
  13. Multi-layer board?

    Tom
     
  14. das

    das Guest

    No, I dont think it is all the other connections and where they go are
    plainly visable. I've found the problem now anyway it wasnt the switch
    but a chip on the board which feeds in from the vga in and audio has
    gone pop. I'll try to see if I can source a new board if not just say
    the tft is ber.
     
  15. James Sweet

    James Sweet Guest

    How do you know the chip is bad? Perhaps you could just replace that part?

    It's almost certainly a multi-layer board, they consist of two double sided
    boards bonded together, most anything that complex will use one.
     
  16. das

    das Guest

    the power switch is on a seperate board which looks like the simple
    one, with just that and the power led on it. the chip that has gone is
    on a different board which all the vga,power connectors are on. The
    chip shows sign's of over heating as there is scorching on the chip
    legs (brown) and the chip itself has a deep mark on it which goes down
    to a white section under the surface. I'll try to source either a new
    chip or board from the tft manufacturer and hopefully that will be the
    only component that has failed.
     
  17. das

    das Guest

    finally the guy im trying to fix it for said that his mate plugged the
    12vdc monitor into a 20vdc power supply that would be why the monitor
    went bang then! still trying to source the chip or board. Does anyone
    know the website address for the company called IT works?
     
  18. James Sweet

    James Sweet Guest

    Ouch, I'm afraid you're probably out of luck with that monitor. Maybe you
    can find one with a cracked panel on ebay?
     
  19. Guys, I don blame experienced Teks for being angry at
    intruders....Anyhow, people who R not Teks are not sopposed to be here,
    not sopposed to fix bcoz they will be a waste of time 2 rest of the
    group....also I ask MEDERATOR to shut those loosers who post ( make
    money fast) scams, for God sake these donkeys don wanna get a decent
    job....bye
     
  20. James Sweet

    James Sweet Guest

    Huh? There's no moderator, this is the usenet. People who aren't techs are
    welcome here, I'm not really a tech either, all we ask is that people do a
    bit of research before posting so we don't have to answer the same questions
    over and over.
     
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