Was there an old box there before you upgraded? It is possible that the coax has no signal? You can also try connecting via wifi. If still having issues you might need to call tech support.
I have the same issue. My mini bx works on other tv's and my tv works with other HDMI devices. I have changed mni boxes, cables and still no signal. I have called tech support no solution. All they told me is that my new 70" smart TV and the new TV one box are not compatible. Difficult to believe coming from Verizon.
@Edg1 wrote: Was there an old box there before you upgraded? It is possible that the coax has no signal? You can also try connecting via wifi. If still having issues you might need to call tech support.
Is it a 4k TV? Are you using a 4k certified hdmi cable? Try using the basic composite (red, white, yellow) connection and see if you have a picture. If not, there is a problem with the feed to the mini, either bad coax or a bad wifi connection.
I seem to be having similar problem with my new Hisense 55 “ 8 series. Keep getting No or weak signal message on TV. Mini box seems to set up OK. Box works with other TV. TV works with full size box. Ran new coax to it, tried it wirelessly, swapped HDMI cables. Called Hisense they said it doesn’t seem to be compatible. Verizon tech is coming to house to sort it out Sunday but this really sucks if buying a new TV is hit or miss on being compatible with the new Fios One stuff.
Usually weak or no signal message refers to OTA signal, not the Fios box. Are you sure your TV is set to the correct HDMI input the Fios box is connected to?
I'm having exact issue right now with my Hisense 4k. I scheduled both verizon to come out and geek squad since bought from Best Buy, but noth say they charge if problem isn't their equipment. TV is still under extended warranty so I'm hoping I can replace, no more Hisense though.