BOARD NO: 0046 GAME: Commando MANUFACTURER: Capcom DATE: 1985 HARNESS: CAPCOM-S SYMPTOM (20/04/96) ------- (1) The background was corrupted during game play (2) The sound volume was very low. SOLUTION -------- (1) Flexing and tapping the top board made the problem worse and intermittent. Changing the ribbon cables had no effect - the fault was definately on the top board. The nature of the corruption was that large graphic blocks contained the wrong peices of backgroung in some columns, and this was carried down the screen as the screen scrolled down. This suggested the the background RAM was either not being loaded correctly or the output of the RAM that was used as the character (ROM) address was being corrupted. Re-soledring the top left ribbon connector, the video RAM, the ROM address latches above the RAM and four or five miscellaneous TTL chips directly below the RAM fixed the game. (2) Visual inspection and trace of the speaker pin back to the amp revealed a leaking 1000uF capacitor with a leg partially pulled out. Replacing it fixed the sound.