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Dell p1110 bright then darkens??

Discussion in 'Electronic Repair' started by [email protected], Dec 26, 2004.

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  1. Guest

    Hello, i bought a used Dell P1110 monitor with a somewhat odd problem.
    When it is cold, it has the notorious overbrightness problem (zero on
    the brightness looks like normal brightness). BUT... as it warms up, it
    slowly returns to normal brightness (~15 to 20 minutes and 30 to 35 on
    the brightness looks normal). I have tried the "color return" feature
    which helped a little bit, but not enough. Am i correct in assuming
    that the resistor fix for the overbrightness problem will not work in
    this case (will it make it normal brightness when cold but too dark
    when warmed up)? What could be causing this and how can i fix it?
    Thanks.
     
  2. Jerry G.

    Jerry G. Guest

    Since it is not one colour that is changing brightness, the fault is common
    to all three. There is a part in the brightness bias circuits, or CRT bias
    circuits, or the HV multiplier that has become thermo sensitive with age.
    You will have to take measurements during the coarse of the problem, in
    order to determine the failed area to begin with.

    Many times, have seen capacitors become thermo sensitive. Also, there is a
    strong possibility that the HV multiplier is defective.

    I guess you know now, why the previous owner sold his monitor! I myself read
    many cases where people buy used equipment, and it is very rare that there
    is one that is in perfect working order.

    --

    Jerry G.
    =====

    Hello, i bought a used Dell P1110 monitor with a somewhat odd problem.
    When it is cold, it has the notorious overbrightness problem (zero on
    the brightness looks like normal brightness). BUT... as it warms up, it
    slowly returns to normal brightness (~15 to 20 minutes and 30 to 35 on
    the brightness looks normal). I have tried the "color return" feature
    which helped a little bit, but not enough. Am i correct in assuming
    that the resistor fix for the overbrightness problem will not work in
    this case (will it make it normal brightness when cold but too dark
    when warmed up)? What could be causing this and how can i fix it?
    Thanks.
     
  3. James Sweet

    James Sweet Guest

    It changes as it warms up so a component is obviously failing. Sounds like a
    job for some freeze spray, you can even buy it at Radio Shack in a pinch, or
    use a can of that compressed air duster stuff held upside down.
     
  4. James Sweet

    James Sweet Guest


    I sell perfectly working used equipment all the time, mostly stuff I've
    repaired but some I simply got something better. Pays to check it out first
    but there's some fine deals out there on used stuff.
     
  5. Andy Cuffe

    Andy Cuffe Guest


    This is completely normal for this monitor. In fact, most Sony
    monitors made in the last 6 years or so exhibit this behavior. You'll
    just have to live with it, or buy a different monitor.
    Andy Cuffe
     
  6. Guest

    Can anyone confirm this? Not that i do not trust you, but i have a
    30-day warranty on the monitor and need to be sure before it expires,
    and this monitor is in perfect condition excluding this issue.
     
  7. Jerry G.

    Jerry G. Guest

    What's the question? Are you asking about the brightness changing on its
    own? If it does, don't buy the monitor.

    --

    Jerry G.
    =====

    Can anyone confirm this? Not that i do not trust you, but i have a
    30-day warranty on the monitor and need to be sure before it expires,
    and this monitor is in perfect condition excluding this issue.
     
  8. Andy Cuffe

    Andy Cuffe Guest

    I currently own 3 21" Sony monitors and all of them are noticeably
    brighter when first turned on (black looks light grey), but stabilize
    after about 10 min. I've repaired at least a dozen Sony monitors of
    this vintage and all of them behaved the same way.


    I can understand your hesitation. I'm surprised they don't design
    them not to do this. I've thought about trying to track down the
    cause, but never had the time.

    Do a google groups search and you'll find a lot of comments about the
    "brightness fade" on sony monitors going all the way back to the
    GDM-500PS.
    Andy Cuffe
     
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