Mike Tyson PlayChoice Cart Issues

laanguiano

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Game starts and plays fine, then when you finish a fight or a title bout if you get that far, it freezes.

??

Always after a fight. Does it after different fights too. Not always the same player.
 
Last edited:
I verified Rom 1 & 5 and they verified without error in my prom burner software.


Anyone with thoughts?
 
Also it goes to black screen. Sound locks. Hitting channel enter pulls back up game instructions, hitting it again goes back to game at the same black screen. Hitting reset goes back to channel select menu.
 
verify correct +5vdc on the game board and on the switcher

could be its up too high or down too low

good luck
 
Update:

Thankfully I have 2 playchoice machines right now :) :) Here is what I've done since.


Tried the Game in another slot(This playchoice has Mike Tyson, SMB2, TMNT1, Baseball Stars, Contra, Super Contra, Techmo Bowl: No change

Put the Game in another playchoice machine(Mike Tyson, Gauntlet, Double Dragon): Worked perfect

Took the PCB of the working playchoice machine, and placed it into the non working playchoice machine. I figured this would test my power supply, and other non pcb related items: Worked perfect

Final test was I took the non working PCB, that had 7 games total, took all out but Mike Tyson: Worked perfect

Hmmmm....

So what does this mean? Something on my PCB is messed up? Having 7 carts is too many for a playchoice? Powersupply needs to be turned up cause having 7 carts is losing power?

I guess I can try a few more scenarios to answer some of these questions.

Any thoughts with this new info?
 
Update:

I put all of the carts from the original playchoice onto the backup playchoice. And the issue came back.

So this makes me rule out the motherboard if its doing it on the backup too.

I thought I ruled out the power supply cause it worked with the backup with only 1 cart installed, but now im wondering if having the extra carts installed somehow messes up with the playchoice power supply voltage?? I dont know.

Also I can take one game chip out at a time, until I find out which game I can take out to make mike tyson work.. but im afraid its going to work when I pull any of the games, not just one specific.

Any thoughts or have you heard or seen anything happening to similar playchoices? I dont see how having more than one playchoice cart installed could be causing this, but it is. Either because of power supply demands, another non on game affecting, or something, who knows.. do you??
 
Sounds to me like it is a power issue with the extra carts in there. You might see what amperage you are pulling when issue appears. My bet is a better power supply and clean connections will solve this issue.


Update:

I put all of the carts from the original playchoice onto the backup playchoice. And the issue came back.

So this makes me rule out the motherboard if its doing it on the backup too.

I thought I ruled out the power supply cause it worked with the backup with only 1 cart installed, but now im wondering if having the extra carts installed somehow messes up with the playchoice power supply voltage?? I dont know.

Also I can take one game chip out at a time, until I find out which game I can take out to make mike tyson work.. but im afraid its going to work when I pull any of the games, not just one specific.

Any thoughts or have you heard or seen anything happening to similar playchoices? I dont see how having more than one playchoice cart installed could be causing this, but it is. Either because of power supply demands, another non on game affecting, or something, who knows.. do you??
 
I'll try measuring the voltage tomorrow. My backup test was with the original power supply and my other was with a switching power supply. So it did it with both... but I'll try the meter.

Another weird observation is when it locks if I leave it on for a bit it eventually starts working and continues where it left off.
 
I'll try measuring the voltage tomorrow. My backup test was with the original power supply and my other was with a switching power supply. So it did it with both... but I'll try the meter.

Another weird observation is when it locks if I leave it on for a bit it eventually starts working and continues where it left off.

What are the current ratings of both power supplies??
 
reseat all the power supply plugs too. Nintendo games, I've brought some back by simply doing that. it's weird.

I run games in all 10 slots on mine, I mean that's what it was designed to do. get a can of deoxit and do all connectors, slots, carts, everything. see where that gets you.
 
Sometimes carts just don't like eachother, sometimes another cart may function fine, but cause issues to another cart. The carts are very intertwined on the pcb. The 9 other carts are not shut off while your playing the one game...... And they can act up.

The most common thing i have seen is the video or work ram have a failure on a different cart than the one your using. Or a cut trace on another cart.

Not saying its not something else, but i thought it was worth mentioning. Ive dealt with alot of playchoice carts.

Voltage and cleanliness are also very important as others have said.
 
Thanks everyone for the tips. had a few discoveries tonight.

So as a reminder. The game worked in both my PCB's with just Mike Tyson Installed. And it worked in both of the cabinets, with different power supplies. Both PCB's failed when fully filled up with games, but I only tested them on 1 of the power supplies. I need to try the same thing on the other power supply cause now Im thinking that one will work... heres why.

So I start to get my meter positioned in the back so I can do some readings. I decide to use the PCB Metal Cage as a ground for my black lead, and as soon as i touch the lead to the chassis, the game continues where it had paused.

Had to be a coincident with timing right?

I play the game to the point it usually locks up, and touched my lead to the chassis again, and boom it plays again. WTF.

Something with ground is definitely screwy. Is it affecting the game? Maybe maybe not? Strange all my other games play perfect.

One question I did have, when testing continuity on a switching power supply, would +12 and -5 or any other voltage section have continuity with each other? I know nothing should have continuity with ground, and thats happening so that needs to be fixed but didnt know on the other.
 
One question I did have, when testing continuity on a switching power supply, would +12 and -5 or any other voltage section have continuity with each other? I know nothing should have continuity with ground, and thats happening so that needs to be fixed but didnt know on the other.

voltages should not have continuity to each other on the power side + or - but grounds should all have continuity. a +12 ground and -5 ground should have close to zero ohms of resistance.

My guess is you have a bad ground.
 
Another update.

I went through every harness wire to make sure it was wired right. Everything looked good.

Through another forum post I was corrected in thinking a beep on my continuity meter meant continuity. Stupid me. I Didn't realize a monitor frame would have a continuity beep with the 5v on the Power Supply.

So my PowerSupply was registering 5v, but my PCB showed 4.86. I turned my powersupply up to 5.1 and all the problems went away.

What I still dont know is why touching a metal part to the ground via monitor chassis would cause the game to work? was i reducing resistance so it didnt need as many volts? i dunno?
 
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