I have a TCL model 55s421. Channel guide for local antenna is wrong for most of the channels, but when changing channels it shows the correct information splash. I've tried changing zip code, rescanning, erase and scan, and factory resetting.
Also, it's missing subchannels, ie it finds 7.1 and 7.3 but not 7.2 (the channel I watch). Wish there was a manual add feature.