G-07 monitor not working

Spyridon

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Just picked up a Mappy with a G07 monitor in it. No neck glow and nothing showing on the screen. Definitely a monitor problem as I plugged in another G07 and it worked fine.

Where should I start on this one? Should I just do the deluxe G07 kit and see where that puts me?
 
grab a copy of the flowchart and check the fuses first. chances are good one is blown and the flowchart should give you an idea of what that may indicate.
 
check the onboard fuses and big white sand resistor on the left first , there is also a smaller one on near the back side of the vertical output transistor heatsinks you should check. if the small fuse is blown, chances are your HOT and fly shit on you , just remember to discharge the filter cap if the small fuse is blown , they hold a good zap, got my twig n berries like that once
 
Just picked up a Mappy with a G07 monitor in it. No neck glow and nothing showing on the screen. Definitely a monitor problem as I plugged in another G07 and it worked fine.

Where should I start on this one? Should I just do the deluxe G07 kit and see where that puts me?

Personally, if I'm keeping a game with a G07, I always install the deluxe kit. Say the flyback is original and you only installed a cap kit, the flyback could easily fail down the road. There's no guarantee that you will fix the monitor with a deluxe kit, but I've done it to 2 or 3 GO7's and had them come back to life so it can't hurt especially if you keep it. There's nothing wrong with doing troubleshooting to find the exact problem of course. My 2 cents.
 
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I sound like a broken record but really, why troubleshoot a 30 year old monitor ? Just throw in the deluxe kit and 99% of the time that fixes it. Troubleshooting original untouched monitors is such a monumental waste of time.
 
I sound like a broken record but really, why troubleshoot a 30 year old monitor ? Just throw in the deluxe kit and 99% of the time that fixes it. Troubleshooting original untouched monitors is such a monumental waste of time.

kinda nice to at least have an idea going into it , shotgun aproach does work sometimes but not always, and not 99% of the time. ok where does he go if the kit gets raster but vertical collapse or new kit and still dead?
 
if its your time , its worth what you put on it, I feel if it can point to other problems and maybe TEACH you a little something about the monitor , then its time well spent. can give clear insight down the road on a different monitor or problems down the road some. I can guarantee a lot of guys know what the monitor does , but do not know what the steps are to get there. patience pays off , instant gratification sometimes , but more often doown the road leads to more confusion
 
With a non-working G07, with an original flyback (heck even with a working G07 with original fly) I would cap it and replace the fly no matter what. If there are still issues after that, then troubleshooting can begin. Out of all the G07s that I've had to repair lately, the overwhelming issue has been - get this - blown flyback because it was the old originals.
 
Well, I figured out the problem. I took a closer look at the monitor. There are at least 3 caps that are completely missing, along with one of the fuses. I found one of the caps in the bottom of the cab. I don't know if the cab got banged around at some point and these came loose or if someone did a real hack job on it trying to repair it. I'll pull it out and add in the deluxe kit and see if there is anything else missing.
 
Just to pile on:

With an original untouched monitor that is not working, do the complete rebuild first, check for cold solder joints or other obvious problems while doing so, and do further troubleshooting if that doesn't help.

Nothing like spending a bunch of time trying one part at a time trying to figure out what the problem was when you can do it all in under an hour and maybe fix it. At the least, you'll know that it's not one of the recommended-to-replace parts that is causing the problem....
 
Well, I figured out the problem. I took a closer look at the monitor. There are at least 3 caps that are completely missing, along with one of the fuses. I found one of the caps in the bottom of the cab. I don't know if the cab got banged around at some point and these came loose or if someone did a real hack job on it trying to repair it. I'll pull it out and add in the deluxe kit and see if there is anything else missing.

One of the missing caps wasn't on the neckboard was it? I've heard it's not uncommon to find the cap on the neck board to have fallen off.
 
if its your time , its worth what you put on it, I feel if it can point to other problems and maybe TEACH you a little something about the monitor , then its time well spent. can give clear insight down the road on a different monitor or problems down the road some. I can guarantee a lot of guys know what the monitor does , but do not know what the steps are to get there. patience pays off , instant gratification sometimes , but more often doown the road leads to more confusion

In an untouched monitor, there can be multiple issues, and new issues created by replacing one part in a tired monitor. It can even be dangerous. It's hard to troubleshoot a tired monitor and hard to learn from troubleshooting a tired monitor. I'ts not just about instant gratification. It's about not trying to troubleshoot a monitor with bad caps, cold solder joints, a weak flyback, and broken horizontal width coil, that pretty much describes every G07 out there. If there is a blown fuse, there is most likely a pretty good reason or reasons for it. I would never just pop in a fuse and fire it up without rebuilding it first. Not worth it.
 
In an untouched monitor, there can be multiple issues, and new issues created by replacing one part in a tired monitor. It can even be dangerous.

I can verify this..it can be very dangerous! (see my exploding flyback thread)

If there is a blown fuse, there is most likely a pretty good reason or reasons for it. I would never just pop in a fuse and fire it up without rebuilding it first. Not worth it.

I found this out the hard way...and could have lived without ever seeing it. Spyridon at least had the common sense to ask first (which I was lacking). Take their advice, Spyridon, give it the deluxe treatment first... at least it's unlikely you have anything "surprise" you if you've done that first. :D
 
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