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Sony Monitor GDMFW-900 Noise / Screen Dropout

Discussion in 'Electronic Repair' started by Bob Kos, Mar 18, 2006.

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  1. Bob Kos

    Bob Kos Guest

    Hi All:

    I have recently resurrected a Sony 24" GDMFW-900 computer monitor from the
    trash. It was in bad shape with regards to being full of dirt & debris ( &
    spilled beer ). It has been working fine for the most part over the last
    month or so. It has one anomalie that concerns me. Every once in a while,
    I will hear a light 'crack' noise. At that same instant, the picture
    collapses for just a brief second. It comes right back on and continues
    working as if nothing has happened. I've only wittnessed this about 6 times
    since I got the monitor running. But it happened twice in one day recently.
    As such, I'm sure that whatever is happening is going to get worse. One
    time only I noticed that there were a few errant single pixel high
    horizontal lines that dashed around the screen immediately before it cracked
    / collapsed. Again, it was fine afterwards.

    Any thoughts on what's going on? Anything preventive that can be done to
    save the set before it blows up a bunch 'o parts? If I took this into a
    shop, it might have to run continuously for a week before the problem would
    show. And then it might only happen once for another week or two. I'd like
    to nip this in the bud if possible. Thanks for any thoughts & suggestions.

    bobkos at earthlink dot net
  2. Andy Cuffe

    Andy Cuffe Guest

    It sounds like the CRT is arcing. It could be inside the CRT, or it
    could be from the anode connector, or CRT socket. Since there was a
    lot of dirt in it, this is particularly likely. Did you disconnect
    the anode connector from the CRT? Any dirt under this can cause
    arcing. Make sure the CRT socket is clean and clean under the anode
    connector and the CRT near the anode connection with alcohol.

    Andy Cuffe

  3. Bob Kos

    Bob Kos Guest

    Hi Andy:

    Thanks for the reply. I did have the anode connection off when I went
    through this monitor. I don't recall the tube socket or anode connection
    being particularly dirty. I also don't specifically recall having cleaned
    anything up in that area. I will take it apart and have a look-see. Thank
    you for your input. It is greatly appreciated.
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