Results 1 to 4 of 4

Thread: Degaussing issue? Moving dark/purple tint on WG CRT

  1. #1
    Another Striker

    Join Date
    Jan 2004
    KY, USA

    Degaussing issue? Moving dark/purple tint on WG CRT

    I have cabinet with an older 25 inch Wells Gardner monitor in it that has developed an issue a while ago with some strange discoloration. Monitor is probably at least 20+ years old.

    I noticed the bottom corner of the monitor had an area about an area with the colors a bit off, a bit dark and the reds had a purple tint to them (similar to how a CRT acts when close to a magnet). This was most apparent on KoF '95 where the POW meter is in red, the 2p side was visibly purple instead of dark red. Cab is in a room in my basement with nothing around it that should cause interference and hasn't been moved around for years.

    I noticed when rearranging cabs the spot would move, depending on what position the cab was facing or where it was at in the room it would vary in intensity or placement on the screen.

    Ideas? Could this be something fixable with a degaussing wand or coil?

  2. #2
    Kula's Candy

    Join Date
    Mar 2017
    Levittown, PA

    Just going off my experience with Sony PVM's and Consumer TV's here, but yes, the built-in degausser could be getting a little weak so an external degausser could fix this....however I've never had that completely fix this problem on any CRT I've tried it on (even bought a powerful pro style degaussing wand).

    Moving the yoke back into position (they can shift over time as things loosen or glue breaks down and gets brittle, the wedges shift, etc) fixed this more often than the above. ...those yoke's can be a bitch to break free sometimes so a strategically placed magnet can sometimes eliminate like 90+% of the discoloration – I find this to be a much easier solution with pretty good results. I've used the little neodymium magnets you can pickup 50 packs of for cheap off Amazon (there's supposedly professional grade proper magnets to use, but I've never found a place to by those from. Those are the type what the factory possibly used when the monitor was made and tuned and can also fall off through age).

  3. #3
    We have purposely
    trained him wrong a joke.
    ChuChu Flamingo's Avatar
    Join Date
    Nov 2010

    What you are experiencing is the earth's natural magnetism affecting your picture. That is why you notice it changing depending upon what direction it is facing (NSWE etc). This is why technicians would often calibrate in the exact spot where the crt would stay. Reason being is that you could get the crt dialed in perfectly convergence wise/geometry, but once it moves due to the earth's magnetism it could shift ever so slightly.

    Another cause for the yoke moving over time is also due to 15 Khz vibrating over years. I thought that was interesting when I read up on it.

    What Dochartaigh said is sound advice. I would first start with some magnets to do some convergence correction and if that doesn't work do a yoke. Just make sure when you loosen it you don't let it move too far ahead or else you have the fun of doing convergence by hand.
    Last edited by ChuChu Flamingo; 02-27-2018 at 04:10 PM.
    Health comes first

  4. #4
    Haomaru's Blade Shiner
    dragonpt's Avatar
    Join Date
    Oct 2008

    The degauss coil should be fine, however PTC's tend to be faulty over time, last year I changed two ( 1 on an CRT TV, another on an monitor) this fixed my issues.
    This is the PTC

    They're usually 2 or 3 pins

    Or, you could just buy or build your own external degauss

    Last edited by dragonpt; 06-27-2019 at 05:45 AM.
    Hyper Neo Geo 64 / Neo Geo CD - Top Loader / Neo Geo Poket Color/ Neo MVS - MV1FZ / 1B / 4F

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts