Double Dragon (Bootleg) Repair Logs
Forum Thread: Double Dragon (Bootleg) PCB Repair
This game is a true 80's classic (well at least around Roskilde, Denmark where I grew up). Back then almost all of my arcade gaming was done at burger joints with names like: Torvegrillen, Burger Place, Burger Boss, and Wopsi Burger. The latter was the best as it had 10+ standard cabinets with games changing about once a month...
Well enough nostalgia for this post; I proudly present (a bootleg of): Double Dragon!
I bought this just a few days ago, and by the symptoms it looked like an easy fix, so I started right away. A self test looking like this is always a good sign.
Hmmm, must have done something wrong when fitting them sockets. Pulled the 157 again and had a look. Now I really appreciated myself for always using breakable header sockets instead of normal sockets, as this gave my a clear look down between the two rows. I found one of the tracks between a via and one of the pins suspicious, and the continuity tester confirmed my hunch.
Now the boot error had gone, but there was still no change in regards to the graphics on screen.
Until now I had only concentrated on the primary PCB, so now I had a look at the secondary one. The component side looked incredibly fine, considering the damages found on the primary one. The solder side however had a fair among of scratches and was also pretty dirty.
Now all was good, and I started test-playing the game. But when I tried a 2-player game, the hit-button for player-2 was unresponsive. A quick glance at the input section on the primary PCB, and my eyes caught this broken resistor array.
By measuring on one it's sisters, I found that this was not the same type as nomally used for pull-ups (with a common point). It was more like 4 parallel resistors just packed into one house. I couldn't find any of those on any of my scraps, so desided on just fitting 4 standard 220Ohms resistors. Now the original bootleggers had put 2 componentpins into each hole, but with the pin-diameter of the standard resistors, I had no chance of doing that. So I desoldered the standard pull-up array
And finally this case is closed };-D
Repair Logs converted to wiki format by Brad from Aussie Arcade.