XG1V4 box HDMI handshake problem

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@Dmf2278 wrote:
We are frequently receiving a no signal message when we turn on the tv. This issue started about three and a half weeks ago. A tech replaced the box and the hdmi cables, I plugged the hdmi cable into a different input port and yet the issue still exists. The only fix is to power down the box through the power preferences every time or toggle back and forth between hdmi input one and two. It is very frustrating to have to reboot or power down the box through power preferences every day. The small box in our bedroom works just fine. From browsing the forum it appears that this issue has been affecting many other users since January. It is unacceptable to me that this issue or software bug has not been fixed. Especially considering the amount of money we pay each month.

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using the voice remote on the TV set top box having the problem, use voice command about. what is the rest of the line to right of "STB Version..."?

My XG1v4 box starting doing this exact same thing within the last few weeks.  I've had this box for a couple of years now and never had this problem.  I believe the hardware is starting to fail.  I am planning on returning the XG1v4 to the local xfinity outlet and getting a new one.

My symptoms are not just the HDMI disconnect that the television reports.  Often, the XG1v4 quits responding to the remote control.  This will last 30-60 seconds before it starts responding again.  The XG1v4 user interface is also noticeably sluggish.  I've tried restarting and even disconnecting and reconnecting power, but that doesn't permanently cure the misbehavior.

(Note:  Dmf2278, the original poster, mentioned that their issue started about three and a half weeks ago.  This may be about the same time my issues started.  Was there a recent firmware update to the XG1v4?).

I also have this problem as described in this post: 

https://forums.xfinity.com/t5/X1/XG1v4-doesn-t-work-with-deep-color-UHD-10-amp-12-bit/m-p/3252555/highlight/false#M179950

Only a full disconnect of power on the comcast box restores the picture and this is painful.

The old XG1 1080p box worked just fine.   I don't use CEC so it is not that causing the problem. New issue is that the LG auto selects Deep Color On for this port when you power it up so where before I could leave it off and it worked, now I am stuck.

Still waiting on a response on that thread for a fix.

Does hitting exit exit exit 1080 on the remote make it see the resolution change and match up?

Ken,

Similar problem with handshake failing. Tried new cables, switched ports, and I'm on my 3rd X1 box. I can eventually get 4K content from the box, like the soccer and baseball games recently, but I have to switch my TV to HDMI 1.4 and then quickly back to HDMI 2.0 to make it work. Rebooting also works. Didn't know about the turning off UHD possible fix--will try that tonight. I have a Comcast tech coming out tomorrow to check levels.

My UHD works fine seemingly, it is the HDR setting (aka Ultra Deep Color, the > 8 bit color scheme) that freaks out.  Try turning off Ultra Deep Color on your TV and see if that helps.  

I feel like the our LG tv (which just updated again a few weeks back) stopped forcing the Comcast box to Ultra Deep Color (but it does force it on the NVIDIA Shield an Fire TV we have switched through the same port on the TV, so that is inconvenient if someone uses one of those gets forced to turn it on and then restarts later with the XG1v4) because the Comcast box will again require a reboot to watch.  

Tried the HDR OFF setting on my TV--a Westinghouse WD55UT4490--with no luck. I give. It's obviously a Xfinity X1 box problem, and since there's little 4K programming available, I just set the box to 1080P and will monitor this forum for any firmware updates. If there's a rare 4K sports match I want to see, my Roku can supply it. I canceled the tech appointment. It would just be a waste of time. 2160@30Hz works, but it's the handshake at 60Hz that the box can't sustain.

I'm having the handshake problem. I go 4k box to Sony reciever to Sony TV. Sometimes everything works fine. Other times I get a black screen. Sometimes unplugging the power to the cable box will fix the issue but sometimes not. Sometimes unplugging the HDMI cable from the reciever and plugging it back in works but sometimes it doesn't. Sometimes I need to turn on my xbox so I get a picture then I can plug in the cable box and it works. This has been very frustrating. This has been going on for months for me.

-Matt

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@mmagikmatt wrote:

I'm having the handshake problem. I go 4k box to Sony reciever to Sony TV.

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Which Sony TV?  At least some of them will only accept 4k HDR @60hz on hdmi ports 2 and 3 and need to have the HDMI setting changed to 'enhanced'.   Also be sure your firmware is updated to the latest available.