This is a “Double Dragon” arcade game pcb.
It´s a clone (“bootleg”) of the original.

This one turned out to be an easy fix.

It did not boot, instead a garbled screen was all i got.
Strangely enough, when powered on for like the tenth time it booted right up and worked fine. (?)
I tried to start it up again and the garbled screen was back.

Apparently something to do with the initialization of the board.
When i took a good look at the board around the CPU that is used for the initialization, i noticed a capacitor that had one leg disconnected.
Turned out it was the decoupling capacitor for the +5v.
I changed the capacitor to a new 10 uf capacitor, and powered up the board.
It booted perfectly.
Tried it 3 more times, and it worked every time.
This board is now repaired. 🙂

I have another Double Dragon board that will be a more powerful enemy, because it complains about the large 64-pin chip (HD63701YOP).
More about that board later. 🙂