Don't rule out the splitter and coax connections. We had a problem with the splitter on our 2016 Thor Synergy but also had to retightened all the loose coax connections. I traced and tracked until I finally located the bad splitter (under the passenger bed) but that was a true learning experience. The splitter was replaced but the Seiki TV's are still cheap junk but now I know how all the coax and HDMI cables are routed.
Ed L
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Ed & Robin Lively
with Nina, Kitt, and Mickey
2016 Thor Synergy TT24 (a.k.a "Ming")
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