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NCD NC2082BA too bright

Discussion in 'Electronic Repair' started by James Sweet, Mar 19, 2008.

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  1. James Sweet

    James Sweet Guest

    I've got one of these monitors sitting here. Picture looks good except it's
    too bright. User brightness control has no effect. Anyone run into this one?
     
  2. bz

    bz Guest

    Google for "monitor too bright"
    There are plenty of similar problems (over half a million).
    NC2082BA monitor too bright
    brings three hits.

    Good luck.




    --
    bz

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap
     
  3. James Sweet

    James Sweet Guest


    This is the very first thing I did of course, as it always is and not
    finding anything relevant (those three hits are for a pay site) I posted
    here. I guess I need to create a sig file that says "yes I googled it
    already". I spent an hour poking around in the monitor, narrowed it down to
    the circuit between the MCU board and the G1 wire, checked the semis and
    they were fine, started checking lytics and found a bunch of bad ones so I
    gave up and scrapped it. I hate to do that but I couldn't get a dime for it
    even in working condition so it's not worth further effort to replace a pile
    of caps and see if it works then.
     
  4. bz

    bz Guest

    I don't remember the site or thread but do recall reading a long thread
    about monitor too bright.
    Some monitors were fixed by running the software setup 'color calibration'.
    Some were fixed by REDUCING the resistance of a resistor in a [bias?]
    circuit.

    There were quite a few people talking about different things they tried.

    The root cause seems to be drifting of the screen bias due to component
    aging.

    I see good, working monitors going into the dumpster because people want
    flat screens.

    It is a throw away society and someday they will throw us away.





    --
    bz 73 de N5BZ k

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap
     
  5. James Sweet

    James Sweet Guest


    Yes those are the usual suspects, however in this case it wasn't simply a
    case of too bright, it was that the front panel control had very little
    range. I could turn down the G2 and get the brightness ok at one resolution
    but then it would be too dim at another. What I did find on these monitors
    is that they're notorious for having loads of bad capacitors, and that was
    supported by my limited probing around with an ESR meter so that would be
    the place to start. This is/was an 11 year old shadow mask monitor with a
    rounded tube, and numerous gashes and scuffs in the case, I'm not sure I
    could even give it away working, much less get anything for it, and with the
    huge backlog of broken crap taking up space, sometimes I have to give up and
    salvage what useful parts I can, even if it means paying to dispose of the
    rest. My plan with this, as I occasionally do, was to fix it and try to give
    it away, there's only so much time that I can devote to one of those. I'd
    rather put the time into saving a late model 22" flat CRT, I love them but
    even those are getting hard to get rid of.
     
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