I have installed one of Catdog's prototype NICAM decoders, but I now have no audio from the tuner. Could this be because this TiVo has a 'MKII stereo' mod where the MSP3430G is replaced by a MSP3430D? I assume that the MSP3430D is trying to decode the tuner SIF rather than using the audio coming in on pins 56 and 57. Is there some way to override this automatic setting?
I have removed Q14 and L28 (the opposite of upgrading a MKI stereo mod to a MKII).