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The "all-in-one" TV IC core can perhaps have different internal settings for each input, or simply the composite ones uses the comb filtering and that perhaps are not optimized (unlikely, but...)...
A lot of "perhaps" due to all these programmable IC's and it's features hidden for the users and even technicians; perhaps one bad choice for given model etc...
Difficult to pinpoit any direct culprit.
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So many projects, so little time...
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