The chip has probably lost its internal connection to one of the power leg (ground or Vcc).

First obvious thing to notice was the RGB array was stripped from the board.

I pressed each SMD chip and when doing so on IC37 glitch disappeared.

I got it in a local auction for 1 (the minimum bid) thanks to my friend Kelvin who sent me the link.

I had set a reminder in my phone but mistankenly entered the wrong time.

So I got the reminder 40 minutes after the end of the auction.

It was the auction site confirming I won the auction Nobody else bidded.

Probably cause the board was advertised as faulty and there are very few arcade repairers over there in New-Zealand.

When I received the board I promptly noticed the game has been repaired before as the work RAM had been put on a socket.

Only fault I could find was when the sprites were close to either the left or the right border they were repeated on the other side with jailbars on them.

As always I identified the function of each RAM, piggybacked them and probed few IC with no clear culprit.

To me it was a counter issue (I found a LS163 next to the sprites RAMs) but before spending more time on the board I contacted Caius from JAMMARCADE who confirmed what I thought: probable counter issue.

I went back to the repair and probed all the LS163 of the video board.

After doing so I was left with only one possibility: trace going to pin 7 was the only possible trace that could be connected to pin 10.

I compared with others LS163 on the board and surely pins 7 and 10 were bridged.

I installed a socket, put back the chip in it and ran a wire between pins 7 and 10.

I then spent the rest of my afternoon playing the game as its one of my favorites.

Game runs fine but sprites flicker and are transparentwith wrong colours.

Again a simple fix.

Game worked fine but was missing the text layer.

I know quite well Capcom boards of that era: text graphics are stored in ROM 05.

Circuitry is quite simple: one ROM, one RAM and few TTL on buses.

I probed the RAM and ROM and found activity were it should be.

Pipi And Bibis Sega Game Fri