Nanao Monitor Woes

coleco1981

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Today I was motivated enough to work on my Sega Turbo project. I pretty much gutted a machine and have all the parts on my workbench. I've been troubleshooting some board and steering issues, however my nanao monitor was working beautifully, crisp color, sharp as hell, I was very happy with the monitor.

Well.. While I was checking voltages on my board, I saw that the monitor turned solid green. After shutting off and restarted, still solid green.

Thinking it was the pcb, I plugged in my test monitor and video output is working fine. Unplugging the monitor from the board while leaving 100v power on, it seems to have no effect.

I pulled the chassis and checked for shorts, burn marks, etc. Everything appears to look good with nothing blown up. I thought it might be the header pins but continuity to those checked out - wiggling them has no effect. I also checked the header pins going to the neckboard and going to the yoke. All appear to have continuity and seem solid.

I'm pretty pissed especially since it seems like it was something I did, but its not obvious to me how checking voltages on the the pcb somehow blew something on my monitor. I guess I should have just used my test monitor.

Regardless, I would really like to get this back up and running. I have a feeling since it was working like a champ a simple cap kits not going to help. If it was a WG-4600 or a G07, it wouldn't be a big deal to swap out, but finding a replacement chassis for this nanao monitor will be hard so I'd really like to figure this one out.

Its possible I shorted the RGB or Sync wires, if that was the case - what components should I check?

Not sure where to start. Please help!

Thanks,

-John
 
I've got the exact same monitor that's having issues as well. Mine is slow to warm up and I found an exact same replacement tube, but that one seems to be missing green. One thing I can tell you is that the cables on the neck board might seem fine and solid, but they might not be. Both my screen and focus wires basically broke off and they had looked good to me previously. I'm going to go ahead and redo all the wired connections on my neckboard.
 
Never worked on this specific monitor but have seen this issue on others. Typically it's going to be a shorted transistor on the neck board or the chassis. It can also be a bad IC that controls the colors. You can try disconnecting just the green from your video connector and see if you still have blue and red.
 
Bad news - replaced the chassis with one off a known good unit and solid green persisted. Its the picture tube. Is there anything I can do or am I screwed?

The picture was SOOO good - this is a shame.
 
I was thinking that - but since it wasn't a progressive issue I'm wondering if it will actually fix it. I have to assume I somehow shorted the RGB lines going to guns. Does anyone in the new England area have a rejuv kit that will be willing to help me? I also posted this on NEACF. Argh so pissed...
 
There must be something about these tubes. Does the tube happen to be a Mitsubishi 510UKB22?
 
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