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# 138325 30-Dec-2013 12:40
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Hi guys,

I just purchased a 70 inch LED Sharp TV ( LC-70LE650X ) for $3k from Harvey Norman (its not on their website for some reason)

If i connect the TV to my computer via VGA cable, when i watch videos, the picture sometimes dims down darker then goes lighter again. If i quit full screen mode, it doesn't happen.

If i connect computer to TV with HDMI cable, this doesn't happen at all so i don't believe its the TV?

My question is, could this be caused by the VGA cable itself? I've used it on my older 40 inch tv for years with no issues.

Id liek to use VGA as i have my computer also connected via HDMI to another HDMI only monitor and that way i dont have to swap plugs around.

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  # 959027 30-Dec-2013 12:47
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What video card are you using?

AMD/ATI cards in the control panel (CCC) have a "dynamic contrast" feature. That if enabled....I have seen act as you describe.



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  # 959037 30-Dec-2013 13:10
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Azzura: What video card are you using?

AMD/ATI cards in the control panel (CCC) have a "dynamic contrast" feature. That if enabled....I have seen act as you describe.


Not sure, i will check when i get home and let you know.

I've used this PC before with VGA on a smaller monitor with no issues so its a bit weird?

Hopefully its not eh TV? DOnt think it would be as works fine with HDMI/ps3 etc...



 
 
 
 


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  # 959047 30-Dec-2013 13:39
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Wouldn't using VGA be a lower resolution than HDMI anyway? I'd expect a VGA connected device to look awful on a 70" display...




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  # 959049 30-Dec-2013 13:50
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My initial concerns was with a possible fault with the TV... however i would expect it to happen on hdmi too if it was TV issue.

VGA looks OK, HDMI is better. Is it possible to get like a double adapter for HDMI that i can plug into the back of my PC to give two HDMI out ports? And could they both be operational at the same time? Currently my video card to output VGA and HDMI at the same time.

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  # 959058 30-Dec-2013 14:22

I use a couple of these. (note that it is not a NZ plug)
I use one to mirror my second monitor onto my AV amp and hence display on the TV. The other I use to mirror the sky box to the TV in the bedroom. They can be a little tricky to make work. Both displays really need to be these same resolution (all my displays are 1080p) and also it can be a bit tricky to get surround sound over the HDMI (PC monitors tend to force the audio to stereo only).

Once set up they work a treat.

Your other option is to get a graphics card with multiple HDMI/DVI outputs. Note: DVI is the same as HDMI but without the audio capability.





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  # 959061 30-Dec-2013 14:29
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Gadgetcity: I use a couple of these. (note that it is not a NZ plug)
I use one to mirror my second monitor onto my AV amp and hence display on the TV. The other I use to mirror the sky box to the TV in the bedroom. They can be a little tricky to make work. Both displays really need to be these same resolution (all my displays are 1080p) and also it can be a bit tricky to get surround sound over the HDMI (PC monitors tend to force the audio to stereo only).

Once set up they work a treat.

Your other option is to get a graphics card with multiple HDMI/DVI outputs. Note: DVI is the same as HDMI but without the audio capability.




My video card has VGA, DVI and HDMI. What if i was to get a DVI to HDMI cable? I found one on trademe but they said it doesnt work from PC to TV.

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  # 959066 30-Dec-2013 14:38
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I've used DVI to HDMI cables before, they work well enough.



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  # 959081 30-Dec-2013 15:03
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Why would this trader say it doesn't work?

http://www.trademe.co.nz/electronics-photography/home-audio/cables/auction-678717797.htm

"-this cable dont support signal from VCR, COMPUTER or LAPTOP output To TV or moniter. "

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  # 959084 30-Dec-2013 15:16

No idea why the seller states that. I use both HDMI to DVI cables and small adapters, like this, with standard hdmi leads. 



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  # 959103 30-Dec-2013 16:13
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Azzura: What video card are you using?

AMD/ATI cards in the control panel (CCC) have a "dynamic contrast" feature. That if enabled....I have seen act as you describe.


I have a NVIDIA GeFource 9500 GT. Is that one of those cards you mentioned?

Google tells me this card does have this feature:

"Dynamic Contrast Enhancement Provides spectacular picture clarity with frame-by-frame optimization"

Any idea how to disable it? And why wouldnt it do it on HDMI?



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  # 959124 30-Dec-2013 16:34
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simon14:
Azzura: What video card are you using?

AMD/ATI cards in the control panel (CCC) have a "dynamic contrast" feature. That if enabled....I have seen act as you describe.


I have a NVIDIA GeFource 9500 GT. Is that one of those cards you mentioned?

Google tells me this card does have this feature:

"Dynamic Contrast Enhancement Provides spectacular picture clarity with frame-by-frame optimization"

Any idea how to disable it? And why wouldnt it do it on HDMI?


OK i found the setting and it was disabled anyway. Damn, there goes that theory.

Any other ideas why tv dims on VGA cable only? Eco mode is off too.

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  # 959157 30-Dec-2013 17:19
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Does the issue look as bad as this?



Just doing a google search on Nvidia Dynamic Contrast Enhancement and it seems some others have had problems with it and video playback issues.

For example http://forum.xbmc.org/showthread.php?tid=84348

Hard to say if this is your issues. Personally I would be leaning towards NVIDIA settings and or some setting/feature in the TV options.

Perhaps someone else will be able to say with certainty...

Heck take a video and post it(?).



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  # 959189 30-Dec-2013 17:40
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Azzura: Does the issue look as bad as this?



Just doing a google search on Nvidia Dynamic Contrast Enhancement and it seems some others have had problems with it and video playback issues.

For example http://forum.xbmc.org/showthread.php?tid=84348

Hard to say if this is your issues. Personally I would be leaning towards NVIDIA settings and or some setting/feature in the TV options.

Perhaps someone else will be able to say with certainty...

Heck take a video and post it(?).


No it's not as bad as that at all. It will go dim for a second or two, then go light again then go dim again for a second or two. Much slower than that.

I'll take a video shortly and put it up.

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  # 959250 30-Dec-2013 20:13
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simon14: Why would this trader say it doesn't work?

http://www.trademe.co.nz/electronics-photography/home-audio/cables/auction-678717797.htm

"-this cable dont support signal from VCR, COMPUTER or LAPTOP output To TV or moniter. "


Perhaps the seller means it won't support carrying an audio signal over the cable to the monitor - because it won't, it will only do the video signal.

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  # 959257 30-Dec-2013 20:58
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gehenna:
simon14: Why would this trader say it doesn't work?

http://www.trademe.co.nz/electronics-photography/home-audio/cables/auction-678717797.htm

"-this cable dont support signal from VCR, COMPUTER or LAPTOP output To TV or moniter. "


Perhaps the seller means it won't support carrying an audio signal over the cable to the monitor - because it won't, it will only do the video signal.


I have successfully used a dvi to hdmi cable which carried the audio as well so you MAY be in luck, however, don't expect it to.

This was with a Nvidia silent card with an audio in connector which I connected to the audio header on the motherboard.



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