Windows 7MC and VLC TV both dropping certain channels when connected to HDMI

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jakoora

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#72131 21-Nov-2010 14:32

Hi all my first post so please forgive my lengthy topic.

I have the following setup.
#PC with Hauppauge Win TV HVR 1200 hybrid TV card.
#video card is ATI HD4890 wth dual DVI noHDMI.
#monitor syncMaster 2233 RZ connected through DVI
#SHARP TV 32" connected to the second DVI port through "ATI DVI to HDMI special adapter that transmits audio and video together to HDMI compliant TV" the HDMI to HDMI cable is 15Meter.

I have extended desktop mode all drivers and software are up to date.

now my problem is when I have windows media centre or VLC playing HD channels they all work fine when I move them to the second monitor (SHARP TV) except TV3 C4 TV3plus and C42 (all Kordia channels) all others work finei.e channel 1 2 maori chinese prime etc freeview HD.

but then to complicate or simplify the problem I tried a generic DVI to HDMI adapter one that doesn't carry audio only video and TV3 works fine !!!!. when the ATI adapter is connected sometimes the TV3's signal disappears as well MCE says no TV signal for all kordia channels.

can someone explain whats going on. is it because audio is carried out as well as the video these channels dont work or what could be the problem.

thanks for reading my lengthy post

richms

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#407412 21-Nov-2010 20:46

is the tuner losing lock or the HDMI connection failing when you try those channels?

Richard rich.ms

jakoora

23 posts

Geek

#407460 21-Nov-2010 23:10

the tuner loses the signal but the hdmi is ok I can play recorded TV ok but I cannot play live TV! when I disconnect the second display it works fine even if the cord still connected to the pc.

richms

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#407464 21-Nov-2010 23:43

internal or USB tuner? Is the card right beside the video card? Is the HDMI cable an ok one, is your antenna cable a good quality one or a cheap barely shielded one?

Richard rich.ms

jakoora

23 posts

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#407577 22-Nov-2010 11:01

internal tuner, hdmi cable good one, antenna good as well. but tuner v close to the video card would that be the problem?

richms

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#407666 22-Nov-2010 13:57

Can be, some tuners dont seem to be very well shileded, and videocards and HDMI are outputting gigbits of data, so noise well into the GHz is possible from the exposed traces.

Richard rich.ms

jakoora

23 posts

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#407707 22-Nov-2010 14:39

but will that explain why the TV works when the generic DVI to HDMI adapter is used rather than the ATI adapter? thanks for the reply.

richms

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#407719 22-Nov-2010 14:59

If you are pushing audio over the DVI link, then it will usually be at a higher bitrate than without since it uses the time between frames to transfer audio. The adapter may have inferior shielding to the other one you use, there may be more active on the card when transfering audio to couple more interference across to the card.

If you want to see (well hear) how bad video cards can be for noise, put an analog soundcard beside one

Richard rich.ms

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jakoora

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#407751 22-Nov-2010 15:51

so do u think I should try and change the PCI-E slot and c wat happens?

richms

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#407766 22-Nov-2010 16:13

defiantly, its a straightforward thing to try and RF direct from card to card is the likly source of the problem.

Richard rich.ms

jakoora

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#407769 22-Nov-2010 16:16

thanks for your support I am away for the week will do that on friday and let u know what happens.

thanks again

jakoora

23 posts

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#409616 25-Nov-2010 20:16

I tried what u suggested I removed my video card and changed the PCI-E2 slot to the one that is furthest from the DVB-T tuner card but still no luck but now all channels can be viewed on main monitor but all TV3 channels cannot be viewed on the TV through the HDMI, very weird problem.

jakoora

23 posts

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#409849 26-Nov-2010 12:02

update to that now channel 3 doesnt work in either main or extended monitor while hdmi cord is plugged in once u unplug it, it works straight away.

jakoora

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#410303 27-Nov-2010 22:56

update to this problem. when I run extended monitor at 60hz refresh rate all the TV channels dont work except for maori TV and freeview HD.