D9200? Way too Green?

zenomorp

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Hey guys. Got a YouTube friend who messaged me saying that he has a monitor that's way too green. It looks like a D9200...

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The adjustments for RGB are through the menu. There aren't any on the neckboard. He says adjusting Red and Blue does nothing. He CAN adjust green up and down, but here's what it looks like adjusted all the way up, then down...

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We've verified that it's not a VGA cable issue or a PCB issue. Any ideas? Trying to get him fixed up. Thanks!

:)
 
Being a Neotec...Transistors on neck...Swap the red into green then put green into red. If you get to much red there is your prob :)
 
Being a Neotec...Transistors on neck...Swap the red into green then put green into red. If you get to much red there is your prob :)

The 9200 is a wells Gardner.....

Anyway, could be a tube issue. You'd need access to a rejuvenator to know for sure.

Mike
 
It was very late and guess I missed it being a 9200 lol. The same concept would work though.
 
9200

Before you do anything!
Take your aux test board coming off the monitor(should have 4 little buttons) and press select and down i believe at the same time. monitor should come up with extra couple of selections in test. Go to color gain i believe it is and select it and their are a few test in that selection also.
go through them and look to see if green value has gone way up and the other two colors are normal. If so then bring green value down. this happens alot with this monitor because of fast turn on's after you just turned it off and also voltage spikes. maybe more reasons also.
If good then with monitor off check transistors with big heat sinks and see if green is shorted.
 
that's definitely something to do with the transistors. I had it all the time with a couple D9200s at the old arcade I worked at. the hidden OSD menu thing will only be if there's a strong tint, not just 1 color like that. they might want to verify the traces and solder pads to the transistors too.

definitely swap them. the green will be the middlemost one of the lot, swap it with one of the others and see if it carries. most likely the red and blue ones are bad. (replaced many of these)

another thing to check is the corresponding ceramic resistors. if any of those popped a leg or a trace, you'll lose the colors too. I think I still have the replacement parts in my mouser... have to look later.

Chad encourages going with a beefier ceramic resistor for each transistor, but I went with same ratings on the monitors I did.
 
Thanks guys. My friend is a total newbie and knows nothing about monitor repair. After guiding him in the right direction, he's going out tomorrow to get a soldering kit to try and swap the xisitors.
 
There is a chance it is a green drive transistor....but from what I've dealt with on these, you probably are looking at a bad tube.....and these don't like rejuv. Hope I'm wrong and its the transistor but I've had alot of tube issues with this model Wells. Good luck
 
never seen a D9x00 with a bad tube before. interesting. now that you say it I'll see more of those haha

the one D9200 I had the most trouble with, I had to make loops to go around transistor legs and solder direct to the traces to make them work again. even where the traces and pads looked fine, the monitor would still go batshit, and if I would give that metal zipper NAOMI cab thing a few whacks it would go away, so I knew it was a solder issue.

I've gotten pretty good at patchwork with these lol

EDIT: the loop and trace approach was done with 30 gauge wire, not magic, I promise.
 
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never seen a D9x00 with a bad tube before. interesting. now that you say it I'll see more of those haha

the one D9200 I had the most trouble with, I had to make loops to go around transistor legs and solder direct to the traces to make them work again. even where the traces and pads looked fine, the monitor would still go batshit, and if I would give that metal zipper NAOMI cab thing a few whacks it would go away, so I knew it was a solder issue.

I've gotten pretty good at patchwork with these lol

EDIT: the loop and trace approach was done with 30 gauge wire, not magic, I promise.

I had one with a bad yoke once. The yoke was bonded, so I had to chuck the tube.

Mike
 
yeah I knew that. I've heard stories of dudes like heatgun-ing the yokes off... I reckon it has to be possible cause I think Wells sells replacement yokes. (for about the price of your soul)
 
My tips

would be remove the Video Sync interface board and solder

the vga Pins very common problem to me..

I dont see a to much green picture I see it as no red or blue

in the picture..

This chassis has a no signal display that pops up

after a minute of no signal and it displays a red,Blue,Green

Pattern this is good to look for to narrow down if the color issues

are just in the monitor..

This Neck board has very few issues with it..

the transistors usally test good..and the tube..

https://www.wellsgardner.com/pdf/Schematics/D9204_D9205_Schematics.pdf
 
My tips

would be remove the Video Sync interface board and solder

the vga Pins very common problem to me..

I dont see a to much green picture I see it as no red or blue

in the picture..

This chassis has a no signal display that pops up

after a minute of no signal and it displays a red,Blue,Green

Pattern this is good to look for to narrow down if the color issues

are just in the monitor..

This Neck board has very few issues with it..

the transistors usally test good..and the tube..

https://www.wellsgardner.com/pdf/Schematics/D9204_D9205_Schematics.pdf

Thanks. I'll let him know.
 
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