Channels disappear in WMC at the output via HDMI

I have a tuner TV USB (connected to an internal antenna) on my Windows 7 laptop. When I use just the laptop, I can watch TV without any problems. However, when I connect the laptop to a monitor via a HDMI cable, all channels disappear and running a scan does not find an any of them. Help the PC on the screen works fine - just Windows Media Center is not.

The laptop is a Dell Inspiron M301Z and the TV tuner is a DVB-T205 August (v2.0).
Someone at - it just an idea as to what might happen?
Thank you

This may or may not be related but I was also faced with HDMI and TV on Media Center and Media Player playback.   You say that using the HDMI interface as a PC monitor works fine, just that WMC or MP do not play TV Live (I guess that's what you mean by "channel disappears").   I encountered the problem that I can not play back recorded OTA TV via the HDMI port, but it works fine on the computer screen, just as you describe.  I have not tried to directly play live TV like this so I do not know if this also fails.  However, I discovered that WMC and MP read properly on the TV connected via the analog VGA port on the laptop.  You can try to hook up a monitor via VGA and then try to watch television on the subject.  In my case, the HDMI connected TV present a good computer bureau and icons, etc, but when I tried to play recorded TV, Media Player won and gave me a message about missing files.  I find that VLC Player works with HDMI, but it does not play HD as well as WMC material due to its fine use of the acceleration of graphics chip.

If your tuner key comes with the TV/DVR software (most of them do), you can also try to run that and see if it works on the HDMI monitor.  I posted a query on this forum about the problem I found in mid-October ("Mirrored display causes error CODEC... "), but no useful response so far.

Tags: Windows

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