K7000 19" - switching from inverted to normal

orion3311

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I compared 2 monitors...an "inverted" K7000 from a Playchoice cab (yes it was a factory monitor), and a non-inverted standard K7000. The inverted PCB was labeled P447A (and is a newer monitor), whereas the standard one I'm comparing to is older and labeled P447.

Only differences I see, is that in the video section right near the video input plug, is that there's 3 sets of resistors and jumpers. On the inverted one, there's a third resistor and the jumper is moved over one spot for each set. On the non-inverted one, that third resistor isn't there and the jumper is in it's place.

Also, there's 2 sets of holes for the 3 non-polar caps, and I believe the inverted one is using the right set of holes and the standard one is using the left set of holes.

Last but not least, Q4 is missing (cut off) from the inverted one but I believe this is apparently an optional mod for a blanking circuit.

So does anyone know, if I simply remove 3 resistors, move over the jumpers and the caps will that turn the inverted one into a normal one?

If no one knows, I plan to try it anyway and will post pics, better details and the results :) This way if you want to use a K7000 in a Nintendo cab, you can invert it right on the chassis, and vice versa if you have one of these oddball inverted ones you want to reuse for non-Nintendo purposes :)
 
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Definitely document it for us. (i.e. pics)
I'm pretty sure I know where abouts on the chassis you're talking about, just never thought about it much, but I can see how it's possible.
 
Please explain....

what was the issue with the "inverted" monitor?

Pictures would be greatly appreciated - I have been having issues with a couple of monitors and really want to understand them better.

Nicely done,
Chris
 
what was the issue with the "inverted" monitor?

"Inverted" in the sense he is talking about means the colors are all flipped around. Blue is Green, Red is Blue, Black is White etc, etc. Some Nintendo games used a color output that would make the games look totally wrong on a standard monitor, so the chassis were modified to compensate for this. And this also worked vice versa, standard games would look totally wrong on a chassis that has already been modified for those Nintendo games. Typically Nintendo used a Sanyo or Sharp monitor and there may or may not have been an inverter board included for swapping between standard and nintendo games. The option orion is working with would make a fairly common monitor (the K7000) capable of doing this AND the option to convert it back to a standard monitor as well.

If any of that made sense....... :)
 
Sorry looong weekend!

Yep Kevin hit the nail on the head - basically think of a film negative, thats the inverted version of your final pic. This particular K7000 monitor is for the most part standard except it takes an inverted signal, and I wanted to use it in a normal cab. Its been on a shelf because I figured it would be too much work to convert back, prob changing transistors, caps, resistors, etc, plus finding the schematics and all to do it.

Turns out...its a lot easier than a I thought. I took this chassis and compared it to a normal K7000 chassis, knowing this is where it would be different (video processing). Found out its pretty simple to change back and forth!

Anyhow...here's the details....First off I'll show the inverted chassis...note the 3 circled groups of resistors and jumpers. On a non-inverted chassis, that third darker resistor would have a jumper in its place, and where you see the jumpers here, would be left open.

Secondly, C4, C5, and C6 (the 3 nonpolar caps towards the left) have two possible hole positions. On the inverted one, they use the set of holes above (or to the right if you're facing it from the video plug side). On the non-inverted one, they use the left/bottom set of holes for those 3 caps.

Note transistor Q4 is cut off (top left). Supposedly this is an optional blanking circuit. Not sure if its supposed to be good or not but this was a newer model, and honestly once converted, the picture was phenominal!

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Now, here's the standard K7000, so you can clearly see what to change. Remove the 3 resistors from positions J8, J9, and J10, and move the jumpers over to that position. Then simply move the 3 nonpolar caps down/to the left. Thats it! To convert a regular K7000 to an inverted monitor, all you need is 3 680ohm resistors and a soldering iron! Thats it!

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Thats what I said - I couldn't believe it was that easy, and damn if it wasn't!

Note - updated the above post with the value of the 3 extra resistors on the "inverted" version (or basically what's needed to invert a standard K7000). They're 680ohms.
 
Can y'all hear that? It's the price of 20EZ's going down.

Now, if y'all can figure out how to power the Nintendo sound board off of the K7000 chassis, we're in business...
 
revive an old thread cause THIS IS AWESOME!

Props and rep for Orion!

So I got a K7000 in a cab a couple months back. It didn't work and I wanted the machine up and running fast so I just swapped in a working K7000. I think it was pieced together cause the light burn in on the monitor didn't match the DD cab that it was in.

So I tried to tackle it tonight... Plugged it in and it looked like a sync issue. I looked at the caps and it was a mixture of original and a couple of replacements. Oddly on the side of the chassis was written Playchoice with a grease pen. I decided to cap the whole thing. It then came up after the cap kit but looked like an inverted screen. I then came the these message boards and did a search for "K7000 inverted" and came across this thread.

I realized that it WAS from PC machine and that the simple changes were to invert the signal/image for that PC10 board. After applying the fixes and replacing Q4 from a donor chassis the picture came up good. It wasn't the strongest colors so I'll tackle it w/ a rejuv/cleaning tomorrow.

Thanks to Orion for this great thread!
 
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Wow...great read. This mod plus a Nintendo AV-01 boad (or this board from Mike's) would allow someone to put pretty much any K7xxx monitor in a cabinet running classic Nintendo hardware. Pretty cool!
 
I know this is an old thread, but I just wanted to thank the author for posting this information, and confirm the same info works on the 13" chassis. I successfully converted my 13" standard color K7000 to a Nintendo-spec inverted color K7000. Picture looks perfect! This information is incredibly valuable as Nintendo K7000 chassis are very hard to get ahold of!

I should also mention Q4 was installed before my modification. I removed it and didn't have any issues.
 
I have a k7000a in a Playchoice single monitor. All I had was white screen. I did a cap kit and noticed q4 was cut. Thinking that was an issue I replaced q4. Now I have a picture but the colors are off.

I'm wondering if my cap kit restored my picture from being white, but putting back q4 is causing the picture to look as I attached. I wonder if removing Q4 is a required step in inverting the K7000a colors.

Any thoughts?
 

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So I found a PC10 Schematic for the Monitor and I have my K7000A Monitor Manual.

I compared them side by side... and there were differences to accommodate the negative colors of the PC10.

Attached is the K7000A Schematic with the changes.

What I found was R28, had a resistor on the back because the PC10 Schematic added a R116 so instead of replacing R28 with an increased value, they just added another line in the schematic for R116 and put in the extra resistor on the back of the board.

There are many things like this.

Also I had originally fixed C5 from having one leg out the board and I had install Q4 cause i saw it was cut. That was a bad idea. As you see in my revisions, the PC10 Schematic does away with Q4 and C5 has to be isolated away from another circuit so you have to pull out one leg and use a jumper.

I need to go over my entire board to make sure its all perfect, but for now I'm happy I have correct colors and its playing great. Just FYI if you have a K7000a and you want to make it compatible with the nintendo, this thread advice may be good for some models of K7000a but not mine.
 

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Wow, the things you find when you search around old threads! I'm working on a K7000a. I just went over the board fixing obvious issues and gave it a first time test and the colors were very odd. I've never seen anything like it before. Digging around I stumbled upon this thread. Had no idea that this was possible! I'll have to check my board to see if it has the inverted setup. Thank you for the info!
 
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