Issue with PC-10 pcb

Lanky Kong

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So after a recent pick up I have 2 pc-10 boards. 1 is 100% working. The other was untested. I plugged the untested one into my converted pc10 cab that had the working one in it. The board booted up and listed the two game carts I had put in it, smb and double dragon.

However as soon as I selected one of the games it made a "poompd" sound and nothing... Then the list refreshed and the game I had selected was no longer listed. Basically it boots up but won't load any game. Any ideas? I'm not familiar with these boards. Thanks in advance for any assistance.

~Lanky Kong
 
What's the difference board-wise between the dual monitor PC-10 pcb and the single monitor PC-10 pcb? I know there is boards for each but how do they differ?

Also anyone know where I can get the ppu and/or cpu for the single monitor pc-10 pcb? I'd love to get this extra board working if I can.

EDIT: Also, this may be a stupid question... but if I have a working single monitor PC-10 pcb can I take the ppu and cpu out of it and put them in my other single monitor PC-10 board that is having the above-mentioned problem to determine if the ppu or cpu is the culprit? They're both socketed on both boards...I believe... so, will a little pry-out & plug-in hurt either board? The last thing I want to do is ruin my working board.

Thanks for any and all help!
 
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EDIT: Also, this may be a stupid question... but if I have a working single monitor PC-10 pcb can I take the ppu and cpu out of it and put them in my other single monitor PC-10 board that is having the above-mentioned problem to determine if the ppu or cpu is the culprit? They're both socketed on both boards...I believe... so, will a little pry-out & plug-in hurt either board? The last thing I want to do is ruin my working board.

Yes, you can swap them and that would be the easiest thing to try to do to see if that is your issue.
 
Yes, you can swap them and that would be the easiest thing to try to do to see if that is your issue.

Ok great! Is there a special tool required to pull them out? I believe I've seen someone using something special before. I've not done much board work before so I want to make sure I take the right precautions and don't damage the chips pulling them out.
 
Google for pics and technique. There are tools, but a small flat head screw driver works fine as well. For removing, be delicate, go slow, and make sure to lift both sides evenly so that you don't bend the pins.

The most important thing to remember is when putting the chips back in, put them in the with the correct orientation. If you put them in backwards, the chips will likely not work any more. If this is your first time, triple check.
 
Google for pics and technique. There are tools, but a small flat head screw driver works fine as well. For removing, be delicate, go slow, and make sure to lift both sides evenly so that you don't bend the pins.

The most important thing to remember is when putting the chips back in, put them in the with the correct orientation. If you put them in backwards, the chips will likely not work any more. If this is your first time, triple check.

Okay great. Correct me if I am wrong but don't the chips typically have a mark or arrow or something on them beyond text to indicate their orientation? I've read of people relying simply on the text and getting screwed because the text was essentially backwards so, they put the chips in wrong.

I'll definitely remember to post with my results after I get a chance to try this. Thanks for all of your help.
 
Yeah, it was in some thread here on the forums recently. A guy went by the text on a rom chip I think and ended up effectively frying it.

Thanks for that pic. The chips on the two PC-10 PCBs I have had that exact divot. Now if I do find out that its either the cpu or ppu that is bad, I am not sure what I am going to do about it. So far, my google searching for sellers of said chips has been inconclusive.
 
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