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mjpries
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2 Messages

Mon, Aug 6, 2018 7:00 AM

XG1V4 box HDMI handshake problem

I have seen several messages/questions in this forum about problems with the XG1V4 box losing its HDMI connection with the TV. But in none of those threads does there appear to be a resolution, so I am going to try to bring up the question/problem again.

 

My setup:

XG1V4 connected via UHD high-speed HDMI cable to Samsung UN65JU6500 TV.

 

Problem:

The TV and XG1V4 work fine together for the whole day. Then, the next morning, when I turn the TV on I get a black screen. I can resolve the problem by rebooting the XG1V4 (obviously not an acceptable way of dealing with the problem). Occassionally, without needing to reboot, I can get the box and the TV to communicate correctly by first connecting the XG1V4 to a much older non-UHD Samsung TV, getting that TV to show correctly, and then connecting the XG1V4 to the UN65JU6500. But that doesn't always work. In any event, even when I do get it to work correctly, it quits working again the next morning. Rinse and repeat.

 

Elsewhere on these forums there have been a couple of suggested fixes. First, turn off PowerSave. I have done that. Second, make sure you have a UHD high-speed cable. I have done that.  Third, make sure that you have the latest firmware on the TV and on the XG1V4 box. I have done that.

 

From reading the various threads on this issue, it appears that it is an HDCP 2.2 issue that is causing the XG1V4 and the TV to have a problem establishing an HDMI handshake. And several Comcast employees suggested that the problem has been sent back to the tech folks to find a solution. But unless I have missed it, I don't see any notice of a resolution.....

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Responses

lesmikesell

Valued Contributor

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527 Messages

2 y ago

Does it make a difference if you lock the xg1v4 output to 720p?

River325

Contributor

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47 Messages

2 y ago

Right, i don't have a 4k tv.  it's LG, has 480p, 720p, 1080i, and 1080p options, and the x1 box automatically chooses: (as shown on the video output resolution) "1080p60hd (best available)"

i know the the x1 will upscale, by why make the box/tv upscale, when there are settings to choose that set the scale?  or, that the box finds and sets as "best available?"

lesmikesell

Valued Contributor

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527 Messages

2 y ago

I thought you said you didn't have a 4k TV.   So 720p is the best resolution for many/most things (for reasons too complicated to explain here - look up why it is used for sports broadcasts).  Even if you do have a 4k TV unless you are watching 4K content your expensive TV can generally upscale as well as the X1 box.    Xfinity only has a tiny amout of 4k programming (updated regularly here: https://www.xfinity.com/support/articles/uhd-4k-faqs) along with the Amazon/Netflix apps that are also probably available on your TV or other devices you own.

River325

Contributor

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47 Messages

2 y ago

i'll have to change it to 720p tonight before i  shut the tv off, then in the mornin when i turn the unit back on see what happens?  but if it only works  on 720p, what's the sense?

lesmikesell

Valued Contributor

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527 Messages

2 y ago

Apparently your TV is offering a 'best available' that doesn't actually work.   Otherwise you wouldn't be having problems.   I'm suggesting trying something that might work.   And since most of the content from Xfinity is delivered at 720p, won't harm what you see.    Your local broadcast channels might be carried at 1080i but 1080p60 is something just made up by the box - which would be OK if the TV accepted it, but not really an improvement and not worth dealing with problems over.

 

River325

Contributor

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47 Messages

2 y ago

as i said yesterday, "set the tv to 720p last night before turning the tv off for the night.  turned it on this morning and same flashing in and out for about 8 minutes before the picture locked.

i didn't think it would make much difference.  i have been comcast customer for 16 years, have never had an issue, have never had a connection issue, until about 3 weeks ago when this all started.  nothing different in the equation, other than the problem.

lesmikesell

Valued Contributor

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527 Messages

2 y ago

That is sounding more like a problem with the TV.  Have you tried a different HDMI port?

River325

Contributor

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47 Messages

2 y ago

tv is wall mounted, only way to to check current hdmi cable at tv is to have someone remove tv from wall mount so that connection can be checked, but so no reason why the connection would all of a sudden change when nothing behind the tv has been touched/changed?

as to trying a different hdmi, i got to run to the store, pick one up, wait till tonight when i'm shutting down, turn tv off, unplug hdmi from box, plug new cable in to box and then to hdmi on side of flat screen.  and then wait till morning and turn set on and see what i get.  more then..thanxz so far for the conversation, regardless...lol

River325

Contributor

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47 Messages

2 y ago

but isn't it strange that every morning there's this problem, for about 8 minutes, then the picture locks in.  no problems the rest of the day.  have turned the tv off for short periods, 30/45mins to an hour, no problem when turning baack on.  have shut it off for over 2 hours and no problem turning back on, picture instantly.  turn it off over night, back on in morning, same problem.

so will try the new cable in the morning.  hopes it not the hdmi, will have to call someone in to change it out for me.

lesmikesell

Valued Contributor

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527 Messages

2 y ago

I've had the HDMI ports go out on a TV - it happens.  I was able to continue using it for a while with component cables but eventually replaced it.

radnortx1

Contributor

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54 Messages

2 y ago

Why don’t you change the subject of your posts. This is not a handshake issue which is what this thread was about.
River325

Contributor

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47 Messages

2 y ago

i would hope that it's not a  handshake problem, and a simple hdmi cable or port, but if my post isn't a handshake problem, then others in this thread aren't either i guess?  how did you come to this conclussion, just curious?

lesmikesell

Valued Contributor

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527 Messages

2 y ago

Real handshake problems would never display anything.  Most of the posts here are about having 4k settings and failing to display when the TV and/or X1 box have been in sleep/low power mode and have different timing as they wake up.  Generally they are OK if you power cycle one or the other or both, or just disconnect/reconnect the HDMI cable, or simulate that by switching the TV input to another port and back.  Some have found a permanent solution, some haven't.

radnortx1

Contributor

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54 Messages

2 y ago

Thanks for explaining the point of this thread!
River325

Contributor

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47 Messages

2 y ago

brand new hdmi cable, plugged in to different hdmi port...............same problem, 9 minutes of flashing from black screen to picture, to black to picture every second, for 9 minutes.  so, what's the next guess?  hdmi motherboard ?  new oled tv on the horizon..............

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