Issue with my Wells Gardner WGM2774 monitor (Crisis Zone)

JedahDoma

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Issue with my Wells Gardner WGM2774 monitor (Crisis Zone)

So I'll try to be as detailed and give as much information as possible. I have a Wells Gardner WGM2774 monitor in a Crisis Zone machine.

The picture was a bit dim and I was having color issues, so I put on a fresh cap kit. While that did make the colors more vibrant, I discovered part of my issue was a missing green from the color spectrum. In the video below I show a few of the issues.

http://www.youtube.com/watch?v=oSUi2zmgMqs&feature=youtu.be

I've also attached pictures of the chassis along with the neck board to give a better view.

http://img.photobucket.com/albums/v299/s7cbassplayer/DSCN4787.jpg
http://img.photobucket.com/albums/v299/s7cbassplayer/DSCN4786.jpg
http://img.photobucket.com/albums/v299/s7cbassplayer/DSCN4785.jpg
http://img.photobucket.com/albums/v299/s7cbassplayer/DSCN4784.jpg
http://img.photobucket.com/albums/v299/s7cbassplayer/DSCN4783.jpg

Does this require a new flyback or will I need to replace a specific cap connected with the green chroma? Thanks in advance.

BTW: I do have an extra Crisis Zone machine with a bad power supply so it would be good for parts if needed.
 
Most of the time when you're missing a certain color from a Wells Gardner monitor it either has something to do with the tube, more much more likely it has something to do with the green transistor on the neck board... See the 3 transistors with the heat sinks on them? One of them runs the green (the other two are red and blue) .... They have a reputation for running very hot and end up burning out... I would replace all 3 of them.. 9 times out of 10 that will give you your missing color back. I had the same issue on my WG in my Killer Instinct and Blitz99 machines.
 
Most of the time when you're missing a certain color from a Wells Gardner monitor it either has something to do with the tube, more much more likely it has something to do with the green transistor on the neck board... See the 3 transistors with the heat sinks on them? One of them runs the green (the other two are red and blue) .... They have a reputation for running very hot and end up burning out... I would replace all 3 of them.. 9 times out of 10 that will give you your missing color back. I had the same issue on my WG in my Killer Instinct and Blitz99 machines.

You're referring to the three big grey capacitors at the top right of the neckboard picture or the three metal "arrowed" shaped pieces of metal below them?
 
three metal "arrowed" shaped pieces of metal below the 3 grey caps. They have those heat shields on them that come off.. . I'm not exactly sure where you can get replacement transistors but I know the guy at arcadecup.com sells them...
 
here's the lowdown on the entire line of the U2000, U5000, K7400 and K7500, (they all share the same neckboard design, albeit with little subtle changes)

the transistors with the purple (usually) heatsinks are what drive the primary colors of red, green and blue. said transistors generally get very hot and over time will lead to "lifting" the solder pads and eventually the traces connecting to them. I had a neckboard on my test monitor where red was barely there, and when I say there was a hairline crack in a trace, I mean.. like you couldn't see it at all.

inevitably when this happens, you're stuck breaking out the 30 gauge wire and replacing the traces with it to restore the connections to the transistors. sometimes you can get lucky and the traces are fine, and just the solder pads are lifting. the most effective way to deal with that I've found is removing the solder from the affected solder joint, and bending the transistor leg flat and resoldering. do the same with the other transistor legs and then you'll have a very solid grip against the back of the neckboard and they won't be able to flex back and forth anymore.

if the solder pad's torn off, you can still do this, but scrape the trace and solder wire to it and connect the wire to the transistor legs.

OTHERWISE the other cause of a missing color of course is caused by a bad gun in the tube. these tubes were generally mated to shitty Zenith tubes, so that's not entirely out of the ordinary. but I've never seen one with a color missing due to the tube, if anything the color will either be dim or you'll have another one that's shorted on all the time (like a tint) .. the "missing" colors are almost always due to the transistor problems I mentioned above.
 
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