Atari Sanyo 14" monitor - looks terrible when inverted

smalltownguy2

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Atari Sanyo 14" monitor - looks terrible when inverted

So I picked up a Nintendo cabaret cabinet a few years back, and it had a 14" Sanyo monitor installed in it. Based on the burn-in I see:

IMG_9408.jpg


I'm guessing it is/was a Warlords Cocktail monitor. Supplied by Sanyo, made for Atari. Built at the factory to run standard non-inverted video.

Here's what the montor looks like when you hook up a Ninendo signal from my DK:

attachment.php


Yep, standard video. No bleeding that I can see.

So I put a regular JAMMA board on there:

IMG_2531.jpg


Picture looks great.

So, I put an inverter in between the signal and the monitor, and the first picture is what I got - colors all bleeding all over.

What can I do to fix this? Is it a ground issue? Monitor Chassis issue? I've tried 2 inverter boards and both gave me the same result.
 
i am guessing you have capped it.

looks to me you have some lineraty issues in the last pic.

for the bleding i have found that the neck board adjustments controll this on most monitors without a contrast pot.

it will varry from game to game some work fine and others you have to adjust the neck pots.

Peace
Buffett
 
So I picked up a Nintendo cabaret cabinet a few years back, and it had a 14" Sanyo monitor installed in it. Based on the burn-in I see:

IMG_9408.jpg


I'm guessing it is/was a Warlords Cocktail monitor. Supplied by Sanyo, made for Atari. Built at the factory to run standard non-inverted video.

Here's what the montor looks like when you hook up a Ninendo signal from my DK:

attachment.php


Yep, standard video. No bleeding that I can see.

So I put a regular JAMMA board on there:

IMG_2531.jpg


Picture looks great.

So, I put an inverter in between the signal and the monitor, and the first picture is what I got - colors all bleeding all over.

What can I do to fix this? Is it a ground issue? Monitor Chassis issue? I've tried 2 inverter boards and both gave me the same result.

Did you try adjusting the screen on the fly back?
 
Did you try adjusting the screen on the fly back?

I pulled it back as far as I could, without ruining the picture integrity. The colors are still being over driven.

I fired the monitor up again today (had it in storage outside for a few months) and I think I'm on to something.

Before I turned the monitor on, I cranked the adjustment pots on the inverter board all the way down. I got the same inverted image as if the board was not being used. Then I cranked each of the pots up, and the image began to get better. Cranking them all the way up, I was able to get the color bleeding to almost go away, but I ran out of pot adjustment.

I believe the solution lies in the resistors on the inverter board. If I could swap them out with larger/smaller values, I bet I could get more room out of the adjustment pots.

Another good thing about modifying the inverter board is that I get to keep this monitor converted to standard video.

What say everyone? Can this be done?
 
That's what's weird - when I use the inverter, I'm turning the pots UP to reduce the drive. It's counter intuitive. It's like I'm increasing the resistance the inverter board is providing to the signal, not reducing it. At any rate, I've got all of the controls on the monitor backed off as far as I can get them, and the pots on the inverter board cranked all the way up. I'm still not getting an acceptable picture.

IMG_2782_zps0806217d.jpg
 
Just putting some closure to this thread - I got a different inverter (AV-01 inverter from a Midway conversion kit) and now the monitor looks great.

Both of the regular inverters I was using were not working right with this little monitor. Either they both were bad, or the Sanyo inverter boards suck.
 
Just putting some closure to this thread - I got a different inverter (AV-01 inverter from a Midway conversion kit) and now the monitor looks great.

Both of the regular inverters I was using were not working right with this little monitor. Either they both were bad, or the Sanyo inverter boards suck.

Awesome small-town
 
SmallTownGuy2-

I have one of these monitors from a gutted Missile Command. How did you wire it up for JAMMA. The connector for video on mine looks like a Molex connector that went to the MC harness and not your standard .156kk pin-type.
 
On mine, the video input wires are soldered directly to the main pcb of the monitor. So I terminated the wires in a standard 6 + 3 connector, ala Bob Roberts extension cable style.

When I want to run Nintendo games on the monitor, I use a custom harness I built using the 6+3 on one end and a standard Nintendo connector on the other end. That allows me to plug the video wires into the output end of my inverter board.

I like using this little 13" on my test bench. It's small and fits on one shelf. The only thing I don't like is that standard signal games appear upside down. I should probably rig up some sort of switch for the yoke wires.
 
Smalltownguy2, did you do anything special to use this with a JAMMA board? I recently recapped mine, but it appears to have a sync issue. I know JAMMA is negative sync, but this came out of a Missile Command cocktail, which I think outputs positive sync.
 
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