Replaced an old TV in working link system with an MX4200, cannot set TV into option 6 for link room. Can only get ir light to blink when attempting to set in option 1. Suspect no ML board in TV although there appears to be a functional master link socket on back of TV. Can you still obtain ML circuit board (that was fitted as an option) and is it difficult to fit? Any help would be appreciated.
Stevemac.