Unhook 1 tv at a time leaving 2 tvs each time hooked up. try every combanation Possable to see if it's a tv problem or if when you have all 3 tvs hooked it makes the signal weak. this can happen cable guys say no but it can been there done that. if 2 works and 1 dont in every combanation the problem is in the cable system. most cable guys check the signal outside. with the splitter block unhooked. this gives a false reading.
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