Status: Successfully repaired on 9/28/2020
A Nintendo Donkey Kong board came in for both a capacitor replacement and repair. The board had an issue where everything displayed in blue.
![](https://shootthecore.tech/wp-content/uploads/2023/01/Eix-ZoNUcAARwDa-849x1024.jpg)
![](https://shootthecore.tech/wp-content/uploads/2023/01/Eix-ZoMU0AAzhpf-802x1024.jpg)
Fortunately Donkey Kong is an early board and is well documented. A little Googleing turned up a thorough list of possible culprits.
https://www.brasington.org/arcade/tech/dk/
This blog pointed me at the PROM at location 2F as the most likely culprit for the blue display. Donkey Kong uses single-wipe sockets which are prone to glitching. Probing the PROM with a logic probe confirmed that several lines weren’t getting signaled, and while probing the lines the full color would blink back on, so the PROM was obviously making a poor connection.
I desoldered the original single-wipe socket and installed a fresh dual-wipe socket.
![](https://shootthecore.tech/wp-content/uploads/2023/01/Ei4UxzyUcAAw1fp-768x1024.jpg)
![](https://shootthecore.tech/wp-content/uploads/2023/01/Ei4UxzyUwAAn0ck-768x1024.jpg)
That resolved the problem – full color was restored.
NOTE: the small amount of vertical blue bleed in this photo was from the Blue Gain being set too high on the JAMMA adapter I was using with this DK board.
![](https://shootthecore.tech/wp-content/uploads/2023/01/EjDuxwqUcAAFVcF-768x1024.jpg)
All that was left to do now was to remove the old capacitors…
![](https://shootthecore.tech/wp-content/uploads/2023/01/EjDuxwWU4AA_cBj-1024x768.jpg)
And install fresh, new capacitors.
![](https://shootthecore.tech/wp-content/uploads/2023/01/EjDuxwWVoAErCe7-1024x768.jpg)
And that was it for this board. It was fun to work on this classic piece of Nintendo history. These board sets are huge!