Can't help with the connections, but the Samsung in our '15 just lost all picture, still had audio. It also is on the televator and stored in the space behind the fireplace. We just junked the Samsung and got a Vizio. But finding a 42" TV any more is difficult and we had to go with a 46" that doesn't quite go down all the way into the cabinet.
Good luck getting a fix, and welcome to the forum.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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