Tron with G07 CBO - Blind Play

eh97ac

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Starting this thread with a proper title....from this one http://forums.arcade-museum.com/showthread.php?t=141878

Thanks already to Dokert for his HOT testing thread and Bob Roberts.

It took 4 hours but I replaced everything in the G07 Deluxe Repair Kit. Double checked all my solder points and installed the chassis back into the cabinet.

Fired her up and voila, a monitor that works....sorta. It is primarily green and I can barely make out the game play. I played with the flyback knobs, front color knobs on the neck, back knobs on the neck (got a nice shock too!). It really likes to stay green.

I am going to do some reading now and see if I missed something but wanted to post up a minor victory.
 
This should be moved to the monitor section.

Unplug your video connector and see if it stays green when the brightness is turned up. If so, remove the green drive transistor on the neckboard and check again. If still green, then you have a tube issue. If green goes away after pulling the transistor, swap it with the blue one. If it changes to blue, replace the transistor. if it stays green, you have another issue...
 
Hmmm...I've got a G07 that does this too. I hope it's not the tube. Although mine turns blue, not green, even if I disconnect the video cable from the game board. It usually starts out good, then turns blue. While it's blue, it sometimes it fades in and out and looks normal. I also can't get the sync to lock in. The chassis was rebuilt by Chris, but I don't know what all he replaced, other than a cap kit and new flyback.
 
This should be moved to the monitor section.

Thought it was in Monitors already?

Unplug your video connector and see if it stays green when the brightness is turned up.

It does stay green

If so, remove the green drive transistor on the neckboard and check again. If still green, then you have a tube issue. If green goes away after pulling the transistor, swap it with the blue one. If it changes to blue, replace the transistor. if it stays green, you have another issue...

I will try this after work. Could you point this out locations on the G07 map?
 
Hmmm...I've got a G07 that does this too. I hope it's not the tube. Although mine turns blue, not green, even if I disconnect the video cable from the game board. It usually starts out good, then turns blue. While it's blue, it sometimes it fades in and out and looks normal. I also can't get the sync to lock in. The chassis was rebuilt by Chris, but I don't know what all he replaced, other than a cap kit and new flyback.

Rejuv your tube

Modessitt are the color transistors you mentioned @ X101- X106?

Yes, those are them. You also may want to rejuv your tube.
 
A great local guy gave me two G07 CBO tubes and chassis to test with.

1 of the tubes when mounted has the cathode hole on the other side, right above the chassis. Is this a problem or can I proceed?
 
1 of the tubes when mounted has the cathode hole on the other side, right above the chassis. Is this a problem or can I proceed?

It would be better if you rotated it up (if mounted horizontally). Wouldn't want some HV leaking out and zapping the chassis...
 
The first donor tube lights up green too. With or without the video cable hooked up.
 
I swapped in the second tube and it's also green.

I then swapped a donor neckboard and it's green too.

Any further ideas?
 
Sounds like you have a short or an open somewhere. Normally, I'd suggest taking a look at the neckboard transistors, but since you've swapped the whole neckboard, that shouldn't be the problem. Check the circuit board carefully for cracks around the RGB amplifier stages. The G07's chassis is brittle and I've seen several with hairline cracks that break traces. You can repair these by scraping back the solder mask and bridging with solder. Check your cap replacement work carefully for shorts and solder bridges.

-Ian
 
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