Game:

Big Fight: Big Trouble in the Atlantic Ocean (1992)

Duration: 1:46

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4

Symptoms#1 : dead, black screen, no clock on both 68000 CPUs

Fix# : replaced a bad 50MHz oscillator @OSC1, its VCC pin was detached from package due corrosion of rust

Symptoms #2 : missing sprites

Fix#2 : replaced some flacky 74LS245 in sprites circuitry (they are for data exchange between the sprite ROMs and the'TZB315' PGA custom sprite generator)

Symptom#3 : sprites are back but all scrambled

Fix#3 : replaced a sprite ROM with a dodgy pin @IC32 and cleaned dirty legs of all the other ones.

Symptoms#4 : some voice samples are missing

Fix#4 : cutted a factory trace on solderside of jumper 'JP4', it wrongly tied address line A17 (pin 30) of voice data ROM with its /CE line (pin 22)

Symptoms#5 : volume is sometimes scratchy.

Fix#5 : removed and sprayed with contact cleaner the 50KOhm potentiometer

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