Undercover Cops (Irem) PCB repair #1
1Symptom: game plays fine but sounds FXs are missing, only music is present.In this kind of hardware (IREM M92) music is generated by YM2151 sound synthesis chip while audio samples from a "NANAO GA20" ASIC custom chip (QFP 80).Probing the pins of the latter revealed no activity on its DATA/ADDRESS bus (it addresses and read data from the MASK ROM 'W42' on ROM board
Fix : reflowed pins of the interconnect CN3 on CPU board (which carries signals to and from 'NANAO GA20' ASIC and MASK ROM on ROM board)
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