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I was completely flummoxed one time, chasing a no-video problem (Maggie color set). Sound and chroma were fine, but absolutely no luma at all. Chased the video amp stages, everything downstream of the v.detector, 'round in circles for a week. But no cigar.
After much hair-pulling, it finally occured to look at the video IFs. Sure enuff, the 2nd v. IF stage was dead. Yet the sound and chroma subcarriers were going thru by pure capacitive coupling, with no discernable attenuation.
Moral of story was to not overlook the v. IFs when there's no video but sound is still good (on an intercarrier set).
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