Two TVs connected to cable with splitter; one works fine, the other displays No Signal

After installing and activating a replacement DTA-HD for our 2015 Samsung LCD TV, the only way we receive a signal is by unplugging either the adapter power cord or the hdmi plug, either end, or unplugging the surge protector power cord.  We have to do that each time we want to watch TV on our large HD flatscreen after it has been powered off, which means at least once a day.  I have tried to get help from every avenue available to me, and the final response I got from JM at Tech Support on the phone was that it must be a wiring problem and that the splitter must be malfunctioning.  The older 1993 non-HD TV continues to have service after installing and activating a replacement DTA, and the signal we receive on the HD TV is good, so is it possible that it could be the splitter?  Our local Xfinity Store is closed and the nearest one is more than an hour and a half away, so getting a replacement splitter is impossible for me right now.