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Problems with Cox cable box and Samsung LN46C670

by xyzzyplugh / June 22, 2010 11:47 PM PDT


I have a new LN46C670 TV and I have been having trouble with the HDMI connection from the Cox cable box. In fact, I'm on my 4th cable box -- all of the others have various problems, ranging from pixelated video (on one of the 2 tuners only), dropping audio, etc.

On this box, the component connection works fine. This indicates to me that the problem is not the wiring in my house.

However, when I switch to HDMI, the video shows only briefly and then disappears. If I turn the TV off and on again, the same thing happens. Video shows, and then disappears. There does not appear to be any sound when this happens either.

Curiously, the video seems to be 480p. Of course, I'd like 1080i.

So, even though the video shows for only a few short seconds, I can turn the TV off and on enough to re-program the cable box to send out 1080i instead. That is, I turn the TV, hit one button the remote to get the settings menu; TV goes blank. I turn the TV off/on and video shows again, and I do the next step to find the video settings, etc. Not fun.

Anyway, setting the cable box to 1080i does not seem to help.

Again, the component video works ok. HDMI does not.

I hooked up a BluRay player and this seems to work fine (video and audio) via HDMI.

Any advice?

The Cox people are suspicious. They said I needed a tech to come out ($$$) before they'd give me another box. So, I have that scheduled for Saturday. Ugh.

I'd like to use HDMI for this...


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by xyzzyplugh / June 22, 2010 11:48 PM PDT

It does seem like all signs point to this particular cable box. But, what is weird is that I get video briefly and then it disappears.

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Problems with Cox cable box and Samsung LN46C670
by Samsung_HD_Tech Samsung staff / June 23, 2010 10:36 AM PDT


Based on what you wrote, there are two possible scenarios.

1. The cable box should be able to lock in a HD setting, such as 720p, 1080i or one of the HD resolutions, and 480 is not a preferred resolution. If the box changes back, then your issue likely lies there. The output resolution in the menu of the cable box might be changed using the component only, then power down the cable box, remove component and attach HDMI, and then power up to see if that does the trick.

2. The HDCP - copy protection - in the box isn't allowing video to pass through, which is what happens when the box doesn't detect a HDCP compliant device with HDMI. If you're able to get sound, but not video, then this also points to the box.

I don't think there's a problem with your line, but the box would definitely be suspect if I had to make a guess.


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