HDMI causes TV Tuner to loose signal!?!?!

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m1k30rz

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#57217 5-Feb-2010 22:36

So I bought a nice shiny new Panasonic TH-L37S10Z 37" LCD TV.

I have a Media Center setup with a Hauppauge HVR-3000 tuner, nVidia 8800GTX graphics card.

If I plug the Media Center into any computer monitor I can watch DVB-T Freeview no problems. If I plug it into the LCD TV via VGA it plays also no problems, but cannot set 1080 resoloution.

If I plug it in via HDMI to the LCD TV it does 1080 resoloution no problem, screen looks seriously sexy awesome, BUT....

IMMEDIATLEY after I plug in the HDMI to the TV and the Media Center (DVI-HDMI adapter then HDMI to HDMI cable) the Hauppauge tuner totally looses signal says it has no signal and of course displays no picture what so ever, IMMEDIATLEY after I unplug the HDMI, the signal comes back... wtf

Also if I have the media center turned on and plugged in via HDMI, then unplug the aerial and plug it in to the TV and use the TV's built in DVB-T Tuner it gets no signal also, but as soon as I turn off the media center or unplug the HDMI the signal comes back on the TV and I can watch it no problem.

W.T.F

So it works under VGA but the HDMI cord somehow makes major interference that causes both the TV and the media center to not be able to get any TV signal what so ever...

Ideas for me please?!?!

Nety

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#296561 6-Feb-2010 07:25

I would suggest first thing to try is to get a different HDMI cable. Maybe just get one that has DVI on one end and HDMI on the other?

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sbiddle

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#296563 6-Feb-2010 08:12

There is lots of DRM stuff that goes on behind the scenes.

Is there any reason why you need to keep unplugging things? If you just leave the cable plugged in does it work fine?

m1k30rz

34 posts

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#296574 6-Feb-2010 09:49

I dont need to unplug that was for troubleshooting.

So I went to DSE and got a "fully sheilded" dvi to hdmi 1.5meter cable, things are better but only margionally, the TV can pick up most things, the media center now can pick up some channels but they have pixelation and C4 doesnt work at all..

Was all fine on my old monitor thru dvi this is so frustrating!! i think im going to try a signal amplifier box any ideas if that will work well?

m1k30rz

34 posts

Geek

#296595 6-Feb-2010 11:59

So I got a higher quality DVI-HDMI cable with ferrite magnets and extra sheilding, that helped a bit so then I also got a UHF signal amplifier + splitter so the media center and tv are both plugged in via that and now its PERFECT!!

Nety

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#296607 6-Feb-2010 13:46

Glad you got it sorted. First time I have heard of a problem like this but at least you got it sorted quite quickly.

richms

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#296612 6-Feb-2010 14:29

dvi is very noisy on cheap crap cables without good shielding - but they are all the same - right??? :D

Richard rich.ms

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#297607 10-Feb-2010 11:22

There's be a bit of weird stuff like that happening with HDMI into tv's etc. One person had a samsung TV and found that if they named the input PC then the TV turned off all 'aids' to the port and their setup worked a lot better. Also the TV had some ports that could be used as a PC input better than others for similar reasons too.

Very weird that the UHF amplification helped when you got a good picture on a monitor etc but as has been mentioned, there is a lot of DRM things going on in the background and TV's are much more picky of this than computer monitors.

And good comment on the cables too richms......