I Know Nothing About Monitors, But Need Help..

hotrod797

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So, I started this thread over in general help:
http://forums.arcade-museum.com/showthread.php?t=119199

But since this has panned out to be more of a monitor issue rather than anything else I figured I would move it over here. I'm not real sure what chassis this is, it looks similar to the sega chassis on Bob Roberts site, but not exact...

Anyway bottom line, I think its shot, I have tried adjusting all the color pots on the neck board but its just not getting anywhere close, so I am looking for suggestions as to a new monitor/chassis replacement and the best place to locate it, any ideas?


Thanks guys and gals, I appreciate all the help I get from this site!
 
Take a photo of the chassis and post it here...

I lied, once I pulled the monitor out and started to take a picute I saw the name and model clear as day! It is Nanao KB240331B

If you still want pictures let me know, I tried to get some, but there isn't enough light in my garage so my camera didn't want to cooperate...
 
I'd still like to see a pic, as that number doesn't match the Nanao's I know of...
 
These are the best I could get out there, if there is any area specifically you would like to see let me know and I will try to get it. Just kind of tight due to the mount...
 

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Ok, this was a chassis used by Kaga/Nanao/Sega called a KZ-20EN.

First thing to do is unplug the video connector and measure the DC voltage for each color wire. It should be about 2vdc. If you have all the colors, then look over the neckboard for cold solder. It's also possible you have a bad green drive transistor....
 
So, what's the problem with it? You're getting a picture but the colors are screwed up? Post a picture of the screen. It could be just adjustments on the chassis, or it could be the picture tube itself.

-Ian
 
Checked all the voltages, they were jumping around (I assume because the game images were changing) but all of them hit at least 2v.

Gave the neck board a quick look over, all the solder looks good and solid (attached a pic)

Where is the transistor and how would I go about checking it?
 

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Pull the neckboard off. There will be three big transistors. test them all...
 
Dumb question, Do I need to discharge this thing (never done that before) Befor I pull the neck board, or is there no need to?
 
There are color pots on the board. Turn them all down, and see if you still get a green screen...
 
I had screwed around will all of those, not a whole lot of change. I tried turning them all back and fourth several times to clean them.
Here is a new video I just took this video is with all the color boards on the chassis turned all the way up as well as all the pots on the neck board.
I tapped on the neck board to see if there was any change, it caused the red to come in and out, but as you can see in the video there is still no blue...

http://www.youtube.com/watch?v=jC6t3tfbros
 
I think you need someone familiar with monitors to look it over and maybe rebuild it...
 
Ok, Thanks for all your help mod, I actually put an ad on the local CL looking for a TV repair man because no one local works on arcades, at least not that I have found...
 
Dunno where you are, but it's probably a better idea to send it to one of the monitor repair guys around here. Arcade monitors are a little different than TV's, and guys who work on newer stuff might not have the experience to fix arcade monitor issues quickly....
 
Ok, Do I need to ship the whole monitor (seems like that would be costly) or just the chassis?

PS: I am in KY near Cincinnati
 
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