Donkey Kong - help please

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Hi;
I had a working Donkey Kong that I converted to a Popeye, (for my son). I wanted to bring it back to a DK and when I put the PCB in the cab, it did not work - will not coin up and no display.
I received the usual "spring" type sound when power is first applied but no display. I removed the HS save kit that was installed on the PCB but received the same initial start up sound but again, no display. The test feature does not work either, no display.
I replaced the ribbon cables and CPU with known good but still received the same start-up sounds with no display.
The PCB is super clean and has no visible damage, I always practiced safe ESD procedures so I do not think that would be the problem.
As I said, it makes the "correct" start-up sound that it had always made but just does not work.
I would like to repair this board if possible, does anyone have any idea of what to look for?
Does this problem sound familiar to anyone else?
Thanks in advance for your help.
Jeff
 
Well, I'm not sure if you know this or not but it could be a voltage issue. Popeye and DK use different power supplies. DK uses the more common PP-7B and Popeye uses a PP-900A
The plugs may fit but the pinout may be different. I'm not 100% sure of that, it is something I will have to look into.
Just verify that you have proper Voltages where they should be first.
 
Yeah, I just checked the schematics and the 900A has no -5 volts
the pinout of both plugs are different

PP-7B
P9 = pins 1,2,3(gnd) pins 4,5 (+12V) pins 6,7 (+5V) pin 8 (-5) pin 9 (+24V)

P10= pins 1,2,3,4(-5V) pins 5,6,7,8(GND) pins 9,10 (+5V)


PP-900A
P9 = pins 1,2,3,4(GND) pins 5,6,7,8(+5V) pin 9(+24V)

P10 = pins 1,2,3,4,5 (GND) pins 6,7,8,9,10(+5V)

Hope that helps somewhat.
 
Hey, I think you just gave me the shot in the brain that I needed!
I had installed a switcher and used the edge connectors on the Popeye PCB as the PCB did not have the same plugs and sockets that the original DK had.
I think that I left off the -5vdc as the Popeye did not require it!
I'll check to make sure but I think that you solved the problem.
I'll post as soon as I am positive and thank you very much again.
Jeff
 
do you have the 10 pin rainbow cable on the dk board? it goes from the cpu board to the video board, and it is used to provide power to the video board. without that you will have no video.
 
I found the problem, in my haste to reinstall the DK PCB, I had forgotten to hook back up the -5vdc line to the DK pcb. I attached it and the board is OOS. I guess firing it up without the -5vdc killed it.
Would anyone happen to know what the consequences are when one does what I have done?? Ex. What ICs' are affected?
Thanks
Jeff
 
I found the problem, in my haste to reinstall the DK PCB, I had forgotten to hook back up the -5vdc line to the DK pcb. I attached it and the board is OOS. I guess firing it up without the -5vdc killed it.
Would anyone happen to know what the consequences are when one does what I have done?? Ex. What ICs' are affected?
Thanks
Jeff

I wouldn't think a lack of -5V would really cause any damage. However, If you applied +5 where you should have applied -5 that's an entirely different problem.
 
do you have the 10 pin rainbow cable on the dk board? it goes from the cpu board to the video board, and it is used to provide power to the video board. without that you will have no video.

Would that also effect the operation of the game, eg: no coin up or test?
The reason I ask is that I don't remember seeing the cable on the PCB, I cannot check right now but will later on today.
Thanks
Jeff
 
Actuall now that I think about it, there is no cable. Originally the PCB set was hooked up with the connectors that ran all over both PCBs but now I am using the SEC as I was for the Popeye PCB so there never was a rainbow connector on the PCB set.
By George, I think you've found the problem!!
I just hope I did not fry anything by forgetting to hook up the -5vdc.
I'll pull the rainbow connector off of my Popeye PCB and attach it to the DK PCB and we shall see what we shall see.
Jeff
 
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