Donkey Kong Issue

[itobandito]

Hey Guys,
   I bought a Donkey Kong Cab to restore I got it fairly cheap beause it was not working.  I cleaned it up and all then tried plugging it in to see what the problem was.  As soon as I plug it in I get this loud hum noise out of the speaker and the video on the monitor is all scrambled.  Do you think this is a PCB issue?  I am not handy with soldering and what not on boards so I was just going to get a working used PCB to swap the other board with.  Do you think this is the correct action???

[Kevin Mullins]

Initially it sounds like a pcb issue to me.
I'd carefully try re-seating any ribbon cables and socketed chips on the boardset.

[qrz]

always a good idea to clean the ribbon connections .
"tarn-x" does a good job of removing grime from ic pins .
be careful when removing /inserting socketed ic's. pins can become fragile w/age...
u may have faulty 'lytics in the pwr sup as well ...

swapping the pcb w/known working unit may verify the fault .

qrz

[WunderCade]

Posting pics of the problem always helps you get better assistance.

If it has the original Sanyo 20EZ monitor in it, then the sound pcb is on-board the monitor, there is cap kit for the sound board and the monitor pcbs available from Bob Roberts..

Cap kits have been know to fix some video issues so it's a good place to start since cap-kits are no-brainers anyway....any monitor that old needs one.

After that...check out this DK repair log for some good info on pcb board issues:

http://www.brasington.org/arcade/tech/dk/