This seems to happen most often to Sony "smart" televisions. It's been an issue for more than a year now. You could try (using the tv remote) switch the source to another port. Then back to the correct port for HDMI cable. If that does not work, then unplug the X1 box for over a minute. Plug it back in to allow reset.
This usually works but is a real pain in wasted time.
The same issue is with Toshiba TV... Xfinity box has a defective hdmi connection and they will not take ownership and fix it.
If the HDMI port on the X1 box is defective, the only fix is to go to the nearest Xfinity Store and do a free swap.
It is June 2019 and the technician still does not have a clue why this is happening. I have to reboot every morning and evening
Did you try the free swap option?
Kayala1, I'd be happy to swap out your box! Sorry to hear about the service issues on your TV. Please let me know if you'd like to try a box swap.
It is not the box, this is my second one. It is not the TV. It seems to be some kind of communicating problem with the boxes. No one seems to know what the fix is.
Got it, Kayala1! Are you using the xg1v4 (4K) DVR by chance?
Sounds like i'm having a simular problem.
I have a small X1 box in my master bedroom that I have to reset atleast every other day.
It's hook up via hdmi cable.
Turn on says no signal-reset box by unplugging power to it.
This also is my second box-had wireless box before that could not keep signal.
I have the same problem and was told to switch my box. Took it to the Comcast place yesterday, brought box home, hooked it up and same blue screen with the message that says no signal detected. Been going on about six months and what we have been doing is just using the input button on the remote to cycle back around to the hmdi input the receiver is on and it comes in that way rather than shutting down the receiver and waiting for it to reboot. Still frustrating as heck and a solution in another forurm states the problem is from the HDMI cable not getting a signal from Comcast. Two tech I have told this two over the phone and neither understood what it meant. SO the struggle is real. Real annoying!
Hi diadem. Thanks for posting in our Forum. Are you experiencing this trouble using our new 4K DVR, the XG1v4 model?
Same here. Model ax013anm
Did you try unplugging and plugging back in both ends of the HDMI cable? Mine wasn't completely seated.
Yup. We have also different hdmi cables and other components to ensure it wasn’t a TV issue. And nope... definitely the cable box.
I hate to say it, but one option is to take the box to the nearest Xfinity Store and get a free swap. The new box comes in a package with everything, including another remote. If you swap, don't use the old power supply - it has been known to cause issues.
I had to go back to the non 4k box, comcast cannot get the 4k boxes to work.
Just an FYI, I have two 4k boxes and they have never had any issues. Maybe we have different setups. Did Comcast install a lossless splitter? Mine is in the attic.
We have two X1 DVR boxes. On Wednesday night, BOTH stopped outputting any signal on the HDMI port - TVs show "no input" - we've tried multiple TVs, multiple inputs on each TV, and multiple HDMI cables. Had been fine for months.
Oddly, the composite output is working fine on both. So I was able to try setting different output resolutions just in case that helped. Nope, nothing - the HDMI port is not active.
No explanation, we're waiting for techs to come out next week.
thereis, thanks for posting on the forums. Definitely a strange case. Sounds like there may be a possible issue with the box or maybe signal flux at the premise that is causing the handshake error. When is the tech scheduled to arrive?