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Hey, I got distracted and just getting back to this project. I also got some advice on how to do this for automatic negative sync: “You can use a XOR circuit seen in VGA to SCART things to convert polarity to whatever is needed automatically. The general idea is that you feed direct sync to...

Great thanks for the suggestion, I saw some old school VGA monitors schematics and they use 7486 chips to do their sync processing. (Different resolutions used different sync polarities) I ordered some 7486 chips to try out.

Thanks, however if this circuit is fed negative sync will it invert back to positive? If so, is there any way to add some smarts to the circuit to pass negative sync signals as is and only invert positive to negative?

Hi, I have a fixed resolution monitor that only accepts negative sync for both H and V. Is there a circuit I can build that does: If source sync is positive, circuit flips to negative. If source sync is negative, circuit passes sync asis. Thanks!

Wow great advice, thanks!

Hi, I have an Asteroids cocktail that has an issue with the video output, whether in game or on the test screen. The vectors are distorted, it seems only in the Y direction. I tried re-seating the connector and a few chips. I also checked and adjusted the board voltage to ~5.075V. I plan to...

I can ship if the buyer arranges it, Price lowered to $450 Thanks!

Hi, selling my Sega Turbo Cabaret. It is in good working condition. Monitor has been re-capped, all sounds and graphics work as well. High score save kit installed. CRT has some light burn in from a different game. Cabinet is in OK shape, no water damage, but side art is missing (or was...

I missed this post, but I sent you a PM anyway. I am still looking for this chassis. I have a 13" Turbo, but would probably be interested in any of the variations. Please PM me if you have one, Thanks!

Bump, still interested,

Looking to buy a Nanao monitor chassis, the type used in a Sega Turbo. I believe the model # is KB240331D Will pay up to $100 for working chassis.

Well, I still haven't figured this one out. I replaced all the mentioned transistors with new versions and still no improvement. Any other ideas?

Bump to $400. Some updated pictures as well.

Yes, just unplug the harness from one PCB and swap to other. Price now $450. I also replaced the gas pedal control pot and re wired the connection to the main harness.

Hi, I am selling my stand up Off Road Challenge game. Works good, just recapped monitor with new flyback and it looks great! I have a Cruisin USA PCB I usually play on it, but the original Off Road Challenge PCB is what is bolted to the machine now. I also have a new gas pedal pot I will...

I'm going for: 7325 :)

Hi guys, no luck so far. Chassis is labeled 120V but it won't run off mains power or from my Galaga. The input voltage to the monitor I measured in the Turbo cab is 100V. I bought a similar chassis for parts, however this chassis is labeled 100V. I tried it just for kicks and it blows a fuse...

Hi guys, I have a Sega Turbo mini with the 13" or 14" Nanao monitor. The problem is the picture has rolling waves for about 20-30 seconds, then the monitor goes in to shutdown. I replaced all of the caps including the big filter caps. Also inductor L902 was broken/corroded off the board when...

Looking for a good width coil for a WG K4900. Thanks!

Hi, I am looking for qty 1 backing plate shown in the picture. I am in the middle of restoring the coin door for my Galalga and misplaced one of these. Also, if you have any coin return button assemblies I would be interested also.