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problem with multiple hdmi inputs into LCD TV

by jcace / September 28, 2009 3:25 AM PDT

This one is a puzzler...I have a Samsung LNS3251D with 2 hmdi inputs. In DVI/HDMI Input 1 I plugged in my pc (dvi out, using a dvi to hdmi adapter + audio cable into the TV). Input 2 has hdmi to hdmi from my cable set top box.

All has been great until I replaced my computer, which has an hdmi out... for some reason when I plugged in the computer's hdmi cable into the input 1 of the tv, input 2 (the cable STB) stopped working, giving me a "not supported mode" message.

Interestingly, when I switch sources from input1 to 2, the input1 (ie the computer) displays for a brief moment on input2, then the screen goes black, then the not supported mode message comes on.

This happens regardless of which hdmi inputs I plug into--I've switched inputs and the STB still does not display.

I'm assuming I can have 2 hdmi inputs simultaneously, right?

My workaround is using my new computer's dvi out + audio cables into input1, in order to allow my STB hdmi output to show, but that doesnt seem like it should be, and I'd like to get digital audio into the TV from my computer.

Any suggestions would be helpful! Thanks.

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by CHUCKMALLEY / September 29, 2009 1:41 AM PDT

In my experience,when I got the "mode not supported" message,it was talking about the resolution of my computer. In your Samsung manual it addresses that.

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problem with multiple hdmi inputs into LCD TV
by Samsung_HD_Tech Samsung staff / September 29, 2009 6:11 AM PDT


In theory, you should be able to hook up two HDMI units simultaneously. Why the cable box stopped working as a result is something I just don't know.

What happens if you put the cable box on Input 1 and the computer on Input 2?

And yes, "Mode Not Supported" has to do with the resolution of the television. The manual lists the supported resolutions, and this may vary by connection type (D-Sub, HDMI, etc)


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problem fixed
by jcace / September 29, 2009 10:19 PM PDT

Thank you both for your replies--you pointed me toward the solution. The short answer is that adjusting the resolution from the pc to 1280 x 720 resolved the problem, even though the not supported mode appeared to related to the cable STB.

The longer answer--I actually have 2 hdmi outs on my computer--one on the motherboard and one on the installed video card. The solution only works on the video card; I still have the same problem fromt the other hdmi out. And, the first time I got it all working, I had no audio from the hdmi! But strangely, the audio came back after shutting everything down and restarting.

Thanks again for your help!

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