TV pixelation when running Internet Speed Test

I am having the same problems with TV pixelation and the sound freezing.Happens on every channel and has been going on for a couple of days now. Rebooted,refreshed,nothing works.

call 800-comcast so they can send a tech to determine the cause of low signal/high noise on some channel frequencies.

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@reswan01 wrote:
We had a tech out 2 weeks ago. He went up the pole outside and removed a filter. It was ok after that for a week. Last week I was told that the issue was channel specific (on the broadcaster end) and that the network team was working on it. That cant be true if I can cause the tv pixelization issue to get immediately worse by running a speed test.

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on a set top box or a roku or smart phone/tablet? 

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@reswan01 wrote:
We had a tech out 2 weeks ago. He went up the pole outside and removed a filter. It was ok after that for a week. Last week I was told that the issue was channel specific (on the broadcaster end) and that the network team was working on it. That cant be true if I can cause the tv pixelization issue to get immediately worse by running a speed test.

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you can check the same channel on a smart phone/tablet or a PC to see the very same network feed that comes to your home (numbered channels). if pixelated on both then that would prove the case, if not pixelated on the streaming device, then it is from comcast to the home or within the home wiring.

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@reswan01 wrote:
Thanks for the reply. I streamed one of the channels on laptop at the same time as viewing the channel on tv. When the speed test is run, the tv pixelates then freezes until the speed test finishes. The laptop stream had no issues at all.

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ok that isn't what I meant (I do apologize).  go to the set top box that has the pixellation problem. use the voice remote command 'about'. what is the rest of the line to the right of "STB Version"? I'm guessing it is an xi5 or xi6. if so, and it is connected via wifi the speed test will attempt to max out the 'home' to 'server' pipe which if your set top box is an xi5/6, it shares and will be starved for data during the test. What should be worked on is pixelation while no speed test is happening to figure out the problem.

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@reswan01 wrote:
Stb version AX014AN_4.0p16s1_PROD_sey

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that is a 4k DVR and it has its own tuners. an internet device should not have any affect on receiving the over the air channel frequencies the cable box uses (for numbered channels). when you play back a recording on that DVR and then press 'ok' button does the source show on the screen as DVR or 'cloud icon' DVR?

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@reswan01 wrote:
It just shows DVR. (No cloud icon)

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ok so the DVR's tuners are working (did not 'fall back'  to IP TV. The DVR should not even be aware of anything you are doing on the internet. some noise is getting into the TV line somewhere. a tech will have to locate the problem. you can remove and reinstall the exposed coax ends to be sure they are seated properly and hand tight. 

Getting pixelation while running a speedtest from a modem is a sign your upstream is near maximum for your modem. I had a similar issue at my parents house a year or so ago. The modem was maxed out around 55dB or more.  It's screaming so loud that it's overloading the X1's tuner.