Sega System C2 motherboard - repair log

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    • Sega System C2 motherboard - repair log

      This board was sent to me by @Mitsurugi-w to see if I could fix it for him.
      I believe he got it from @KalessinDB who thought had fried it via improper multi kit installation.
      This wasn't the case, please continue reading. ;)

      I received the board without any ROM so first thing I did was checking security chip reference from which I learned the game was originally Puyo Puyo.
      I burnt the original, non patched, roms for that game as a step by step approach. And game booted and played totally fine!
      Weird.

      Then I installed the multi kit and found no game but Puyo Puyo would boot. I even ran the memory check from Puyo Puyo and all tested chips reported "GOOD".
      Of course all jumpers were set properly, board was clean, no apparent damage.
      So I started to inspect carefully the board and something caught my eye: pins 33 & 34 of the I/O chip 315-5296 were bridged by a small "ball" of solder. It happens sometimes during the soldering process that the solder "boils" and the board gets splattered with tiny drops of solder. That bridge wasn't normal to me since two different traces were connected to each pin. I removed it and magically board could boot all the games.

      To sum up, board was originally a Puyo Puyo and had a manufacturing defect preventing other games to boot!
      No damage was done with the improper kit installation.
      Looking for:
      - OutRun boardset even untested or not working
      - Sega Super Scaler hardware (Out Run, Model X, Model Y), even with faulty PCM chip



      01010011 01000101 01000011 01010010 01000101 01010100 00100000 01001101 01000101 01001110 01010101 00100000 01000111 01010101 01011001
    • Yes visual inspection, I was actually checking all pins on the SMD custom chips were soldered properly when I found the bridge.
      Looking for:
      - OutRun boardset even untested or not working
      - Sega Super Scaler hardware (Out Run, Model X, Model Y), even with faulty PCM chip



      01010011 01000101 01000011 01010010 01000101 01010100 00100000 01001101 01000101 01001110 01010101 00100000 01000111 01010101 01011001