HDTV Picture Setting forum

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Only getting audio on HD channels on brand-new HDTV

by twisted5000 / September 6, 2009 7:18 AM PDT

Hello everyone -

I'd really appreciate any help you might be able to provide. I just bought my first HDTV. It's far from a "high-end" (Dynex DX-L42-10A) but I don't believe the troubles I'm having are brand quality related. (hopefully!)

Anyway, to my problem -
I have an HDMI cable connecting the cable box (which I've already verified is an HD cable box and is set up properly according to my cable company), to my TV. All of the non-HD channels work perfectly. Everything is perfect.

As soon as I click to an HD channel, the "HD" light on the cable box lights up, as though it is recognizing that I'm on an HD channel, and I can HEAR the audio, but there is no video. It's just a black screen.

Does anyone have any ideas for what to check? I'd *really* appreciate any help!

Thanks in advance -

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HD settings
by tecbal / September 7, 2009 6:03 AM PDT

OK, had the same problem with a Philip's TV and good old Comcast. Comcast really doesn't have very good support in this arena because on my three calls no one knew anything about the problem. I was getting just what you are getting sound but no video. The problem lies in the fact the Comcast box is set up so that if you plug the HDMI cable into a non compliant port the picture is not passed but the sound is. This is a copyrighted protection to make sure you are not recording anything from the cable system, but I am not sure of exactly what. Anyway, you have two solutions, connect with component cables or fine an HDMI port on the back of your TV that is compliant with this signal. On my Philips it was HDMI-3 that met the requirement. If you have only one HDMI connection, then you may have to try component cables.

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hd trouble
by rronr / September 13, 2009 3:17 AM PDT
In reply to: HD settings

had similar problem caused by weak signal stregnth.i have phones 3 tvs and internet all on cable. as the signal splits between these devises it weakens. the hd picture requires higher signal stregnth than standard resolution.cable provider reconfigured the paths and installed an electronic signal amplifier. in my case i did not lose all the hd stations but the ones i did get were choppy i cant remember if audio was present on the stations i wasnt receiving. any ways did your cable provider check to see that the signal stregnth to the cable box was sufficient?

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by twisted5000 / September 13, 2009 5:51 AM PDT
In reply to: hd trouble

Thanks a lot, everyone. I called Comcast and had them send a guy out, because nothing I did worked. The guy said he'd seen this a number of times and that the cable box I had was, "crap." He gave me the "old style" box, I plugged in the HDMI, and it was good to go.

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