XG1V4 box HDMI handshake problem

Great to hear that.  In our case, for awhile, the DVR box was actually ok (i.e., TV worked fine) but the issue shifted to our two other boxes with two different issues every morning.  Xfninity was out a few times . . . today they changed the DVR box to a different one.  We'll see what happends after the next update tonight.  

I know the box changes have not worked before (this is our 3rd or 4th) but maybe they have done something since we were OK at the main box for the past couple of weeks.

I'll write back in a few days to update everyone.

Same problem here - black screen with no audio or video every few days. Very annoying and I've found only power cycle fixes. I will try the TV HDMI input change next time it happens . My equipment: XG1-v4-A, Denon AVR-X4400W Receiver, Sony XBR940D 75", Comcast 4K high speed HDMI cable from X1 to AVR; 4k high speed cable using ARC from TV to AVR. 

Hoping a fix comes soon otherwise I am swapping this out to older box as there really is no benefit to the 4k box vs 1080p. Netflix is way better on the Android  Sony TV app with Atmos support and a cleaner picture.

Good News.  SO FAR  I have not had the problem since I tried your suggestio to turn off the UHD setting to the HDMI port that the  X1 box is connected to.    It has been 10 days since I changed the setting and have not experienced the black screen issue. 

Prior to that I had to restart the X1 every 2/3 days to get a picture on the TV.  

Thank you for your suggestion.   I have been having this problem for months and tried everything people on this forum suggested.   Nothing worked till you mentioned this.

Hopefully it stays like this.

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@rlee131 wrote:

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@jmg1951 wrote:
I found 2 solutions to this problem.
1)On your Xfinity remote go to settings, device settings,power preference, and turn your power saver ON. Box will go to sleep at night but when you turn your tv on in the am it will turn the box on also. When both the box and tv turn on together the video will connect with no problem.
2) If you have a Samsung tv or a tv with the HDMI UHD COLOR setting turn it off for the HDMI cable box input. Per Samsung this setting must be on for any type of gaming because it increases the refresh rate but for a cable box with 4K it has no effect. I have mine turned off and it’s been working every morning for the last week and the 4K does come thru on Netflix.

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Thanks for your suggestions.  #1 That’s how mine is currently set.  

#2 I’ve never tried that.  I just changed and will see what happens.  I’ll let you know. I sure hope that works. 

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Letting the DVR box go into sleep mode worked for me even though I'm using the UHD Color off on my TV. When youn turn the tv on in the morning the box should wake up also as long as your remote is programed correctly to tun the tv and box at the same time. When the box and tv turn on together they both are looking for a video signal at the same time and connect with no problem.

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@BrianHCM1 wrote:
That’s what I did on my LG once the UHD setting was turned off it works with the 4K setting for regular TV. If I switch to Netflix via X1 box for an UHD movie, the tv will automatically switch to UHD on. However when I switch back to regular tv, it will lose signal and go black. I then have to manually turn off UHD on the tv for it to work. It looks like a compatibility issue since Comcast doesn’t offer any 4K programs for regular tv. My guess is the tv is looking for the signal that doesn’t exist yet and just gives up.

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On my 2015 3D UHD Samsung TV the UHD color setting can be set "on" or "off" for each individual HDMI port. For IPV (Internet broadband) UHD color setting is always "on" as it should be.   Check your LG manual to set if your's works that way. My tv never switches them from where I set them.

A possible exception might be if your television just received a "Update", or if you selected a "Reset to factory default settings.

If I switch the UHD Color onnor off I also get a black screen , Comcast is working on the problem because I heard from them last week.

Don't give up on Comcast yet, they have been working on the problem. Last week Comcast called me on a update they wanted to send to my box to see if there were any changes. Sorry to say the updated did not correct the condition but at least their working on solutions. 

Glad to hear it works for you too! Mine has been working 3 weeks without a problem.

Amazing that you have been able to get Comcast to say they are working on it. In my area I gave had three technicians out to my house, 4 telephone conversations with support (two times with supervisors I requested to speak to) replaced the X1 box twice, and one visit to the Xfinity store  EVERYONE says they have no knowledge of the problem and it must be my TV. 

Anyway your suggestion to turn off UHD to the HDMI port WORKED so all is good now

one issue that has shown up is that even though the X1 is set to power saver every couple of days in the morning before turning the system on the light on the X1 is already on so it did not turn off since I last shut down the TV ( 14 hours 

not worried about because your fix took care of the HANDSHAKE issue Would love to connect your Comcast people with those supporting this area 

Acturally the light on my box in power saving mode does go off after a couple of hours after the tv is turned off.   Then in the morning it does not go on till I hit the remote turning on the box, Sound and TV.   This happend all the time until I change the HDMI setting that fixed the handshake.   Now when I get up in the morning about 50% of the time the X1 box light is on unlike previously when the the was not on till I hit the remote.  

Not a big deal, dont really care about the power saving mode its just that  for some reason it does not function as it did befor