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Cornerstone Monitor - missing blue color

Discussion in 'Electronic Repair' started by John Dough, Dec 26, 2004.

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  1. John Dough

    John Dough Guest

    I'm trying to repair my cornerstone monitor which is missing the color blue.

    I've tracked it down to a driver chip (I think) - VPS10 (CRT Display video
    amplifier)

    If I disconnect the input pin (pin 10) the signal is the same shape as the
    other two colors - red and green. The moment I connect the input back the
    amplitute of the signal almost halves. I've checked the output pins as I
    thought it might be pulling the input down - but no go. All
    resistors/caps/diode check out ok.

    Does it sound like the chip is faulty - is this a common fault? Can anyone
    recommend a replacement - the local exeltroniucs shop doesnt stock them :(
     
  2. Jerry G.

    Jerry G. Guest

    I would try the IC at the point where you are, and from your description. I
    have not serviced the particular make and model of monitor you have, but
    have had similar experience with others.

    --

    Jerry G.
    ======


    I'm trying to repair my cornerstone monitor which is missing the color blue.

    I've tracked it down to a driver chip (I think) - VPS10 (CRT Display video
    amplifier)

    If I disconnect the input pin (pin 10) the signal is the same shape as the
    other two colors - red and green. The moment I connect the input back the
    amplitute of the signal almost halves. I've checked the output pins as I
    thought it might be pulling the input down - but no go. All
    resistors/caps/diode check out ok.

    Does it sound like the chip is faulty - is this a common fault? Can anyone
    recommend a replacement - the local exeltroniucs shop doesnt stock them :(
     
  3. Techforce

    Techforce Guest

    They do have a history of fail, you can purchase here: http://www.ljecc.com/


    | I'm trying to repair my cornerstone monitor which is missing the color
    blue.
    |
    | I've tracked it down to a driver chip (I think) - VPS10 (CRT Display video
    | amplifier)
    |
    | If I disconnect the input pin (pin 10) the signal is the same shape as the
    | other two colors - red and green. The moment I connect the input back the
    | amplitute of the signal almost halves. I've checked the output pins as I
    | thought it might be pulling the input down - but no go. All
    | resistors/caps/diode check out ok.
    |
    | Does it sound like the chip is faulty - is this a common fault? Can anyone
    | recommend a replacement - the local exeltroniucs shop doesnt stock them :(
    |
    |
     
  4. John Dough

    John Dough Guest

    Thanks - managed to source a chip - replaced it, and it works like a bomb!!
     
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