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Comcast cable feed issues with older plasma

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Old 02-01-2012, 09:40 AM   #1
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Default Comcast cable feed issues with older plasma

I have recently upgraded my comcast cable box and now my 5 year old Panasonic 50" plasma is having issues. The cable feed is coming into the plasma via HDMI and both the video and audio cut out in 5 to 10 second increments (i.e. picture goes black and sound stops then picture and sound returns). I plugged in my blue ray to the same HDMI feed and the plasma works great with no video/audio interruptions. Comcast has been out twice and can not fix this issue. ANY IDEAS WOULD BE APPRECIATED

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Old 02-01-2012, 10:01 AM   #2
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How was it hooked up before you 'upgraded' your cable box and by upgraded do you mean a firmware upgrade on the same box or exchanged for a newer box? Sound like a HDMI handshake issue to me.
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Old 02-01-2012, 10:45 AM   #3
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Default HDMI issues with Comcast

I too noticed the same issue when I replaced my older DLP with a new LCD TV. I also exchanged the Comcast Motorola 3400 DVR and still had the same issue. I also swapped a Comcast PACE HD box in and it worked fine, so it appears that there is indeed an HDMI handshaking issue with the Motorola boxes. I then replaced the HDMI with a Component to my new LCD and the problem is solved with the Motorola 3400 DVR.
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Old 02-03-2012, 09:45 AM   #4
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The original set-up had the cable feed from the cable box running into a Dennon Home theater receiver then from the Dennon out to the plasma via HDMI - this setup worked great for 4 years.Then the cable box was changed and the audio stopped working (Comcast blamed the Dennon) and the wiring was reconfigured to by pass the Dennon and go directly to the plasma. The direct HDMI connect to the Plasma did not resolve the auidio and video interruptions so Comcast said the plasma was shot. I then hooked up my blue ray to the HDMI feed into the plasma and it works perfectly. So I have to think this cable box is not communicating properly with my plasma casing the video/audio to cut out constantly?
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Old 02-05-2012, 05:08 AM   #5
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I have a five year old 50 inch Panasonic Plasma HDTV also. If I use a HDMI cable between the Cox supplied SA 8240HDC the TV and the SA box lose the handshake on occasion if I switch from 1080i to 480p for example or back again. The only way to get the comms between the TV and the SA box is to reboot the SA box.

My workarounds are...
  • Use component cables (3-video/2-audio) instead of the HDMI cable.
  • Use HDMI but configure the SA box to only output either 1080i or 720p to the TV versus all of the resolutions.
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