Nintendo Playchoice Monitor (single version)

iyouwas

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Hello, Would anyone have a clue what is causing my monitor to do this sort of display?

How can i fix this.

It sometimes cuts in half also. With half on the left and half on the right.

It only does this during selecting a game, and not during actual game play.

Thanks!!

Tom
 

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looks like you need to adjust the h hold pot on the chassis its not on the remote its on the main chassis around the middle of it
 
I did the H Center adjustments, but it only affected the game play. Not the game select screen. If I select a game when its distorted, then exit back to the game select screen, sometimes, more often than not, its back to normal.

It still hasn't corrected the issue.

I'm out of ideas.

Anybody have this issue before?


Tom
 
The game select screen and the game screen are driven by 2 different sources. If it isn't the monitor then it's possible there is a problem on the PCB that is causing your problem.
 
That makes perfect sense.

A chip or something must be getting weaker or shorting out.

I really wish I knew more about these boards, other than swapping out the games.
but,,, I'm sure in due time, ill learn. :)

I just don't want it to get worse before I can figure this out.
 
I would try reseating the roms and the z80.

If that doesn't work maybe replace the z80, cause that is what controls the menu system.
 
I located the Z80 chip.
It was under the roms, witch I took out and reseated.

Pulled every rom out as well and reseated those too.

But problem still persists.

So a new Z80 chip would be my next step correct?
 
Replaced the Z80 today, with a fresh new one.
But got the same results.
Now I'm at a loss for what could be causing this issue.
Could it be a resistor or a failed chip elsewhere?
I'm sorry for flooding this forum with my issue, but who else could I ask?
Just trying to solve a problem, and you guys are the best at problem solving. :)
 
It is definately a problem with the PC gameboard. I have two different PC 10's with two different monitors/chassis and both PC's have this problem upon start up. It eventually settles down and corrects itself, but we need to investigate this further to come up with a solution.
 
Thanks for replying!
I agree.
There has to be a solution to our problem. Id hate to have to buy a new pc board only to have this problem arise eventually.
Its strange that nobody really knows much about this problem don't you think?
Please! If you find even the slightest bit of information, please let me know?
Private message me. Anything. I'm on a mission! Lol.

Thanks!

Tom
 
Just an update on the menu situation.
I tried a new PC gameboard, and the problem persists.
The only things left to try, are the wiring harness connecting the board to the chassis,
And the chassis and monitor itself.
 
Just an update on the menu situation.
I tried a new PC gameboard, and the problem persists.
The only things left to try, are the wiring harness connecting the board to the chassis,
And the chassis and monitor itself.

How do you know they new PC gameboard you tried wasn't defective too? It could have had the same problem as the previous board, which would give the same result.
 
That is possibe, but the board was tested/sold working by a fellow klov member.
I just can't believe that even though this issue has been seen by people other than us, nobody has pinpointed a cause, or a solution to why this happens and how to fix it.

I absolutly love my playchoice, and have had a great time collecting games, and showing it off.
But I'm seriously losing patience and money trying to troubleshoot its issues.
 
Is the playchoice chassis set up to have two seperate horizontal hold adjustments for each of the input signals coming out of the board?
Just a thought.
I can see where the menu harness goes into the chassis, but not the gameplay.
 
Man, I think you've been getting some bunk advice.

It can't be the boardset, since you tried a seperate one.

It's definately in the monitor.

This setup was designed for two monitors as well, so there's a part of the board that drives the menu select that on the two monitor goes to the top monitor, and a seperate part of the board that drives the gameplay, which goes to the bottom monitor.

On your 1 monitor board, they must have redesigned it to output to the same monitor, but now it switches back and forth depending on if it's showing the game select screen, or the gameplay screen. It's still likely using two parts of the board to produce the same screens, just having the roms redirect the two images at different times.

SO, what I'm saying is, two different sets of signals get sent to the monitor. All the 1 screen boards do this, that's why you had the same problem when you swapped the board.

Your problem is your monitor is adjusted wrong. It's just BARRRRRELY in adjustment, as far as the Horizontal Frequency goes. When it swaps to the select screen, it sends a slightly different sync signal, so the monitor is right on the edge of being adjusted right, and then falls out of adjustment when it switches.

Wait till it goes crazy on you again, and then adjust the horizontal frequency; NOT the horizontal center! Thats' not the right pot, there's a pot sticking straight up off the board just behind the flyback that is the horizontal frequency pot. Look where your cage is around the flyback, just behind that is the horizontal frequency... wait till it messes up, then fix it with that knob and see if you aren't in business.
 
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