How can I troubleshoot failure to scan channels?

I've been able to do it with the hardware I have now, so the problem is either I forgot how or the software has changed. I tried adding a mux for real ATSC channel 13 but with about 5 frequencies to choose from it's a lot of hit and miss. In any case, adding muxes doesn't seem to do anything, (not in the service tab or anywhere else) and no feedback is given.
I'm running LibreELEC 7.03 on a R.Pi 3. The Tvheadend backend is 4.2. The TV device is Hauppauge WinTV-HVR-955Q but the web interface gives LG Electronics LGDT3306A VSB/QAM Frontend : ATSC

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RE: How can I troubleshoot failure to scan channels? - Added by M J almost 8 years ago

In the end, someone in another forum recommended I not use 4.2, so I downgraded to 4.0. This didn't help one bit, until I realized that I was also offered those pre-selected muxes that every article I've read told me not to use. Selecting one of those created all the muxes I could need. So it seems all I really needed was those elusive parameters that no amount of Googling could get me.

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