Does X1 tune all channels using IPTV?

I'm currently having signal issues where my (non-X1/Cablecard) TV is completely out, but I still have Internet (barely as power is - 13 dBMV and SNR is 31).  I can watch like TV is I use the Stream app (I.e. IPTV) on my iPad or the Roku app so IPTV works for me.  

I spoke to a neighbor a block over and she said her TV is still working. I don't know if she has X1 or not.

I'm trying to determine if X1 uses IPTV to watch all channels or switches to IPTV if tuning channels fails or if the signal issues are localized to my block or house?

edit: I came up with another possible explanation.  The person's house is "upstream" of mine on the cable lines, so theoretically the signals at her house should be stronger.  It's also possible the line between my house and her was damaged.