Forum Thread

HDMI out from PC to 1080p TV only going up to 1600x900

Entropic01 7,398 345 September 13, 2011 at 08:13 PM
I have a PC with an HDMI out. The HDMI out from my PC is going to my soundbar which then goes to my TV.

1) PC with Radeon HD6870 and HDMI out
2) Sony HT-CT100 (1080p capable)
3) Samsung LN4665F (1080p)

HD6870 <--HDMI--> HT-CT100 <--HDMI--> LN4665F

I'm getting video and audio out from my PC to my soundbar and TV no problem. However, if I set the output to my TV at 1920x1080 (1080p) the entire image is not captured on the TV (the edges of the image are clipped).

However if I set the display to 1600x900, I get the full image. So my question is what am I doing wrong to get full 1920x1080p to my TV?

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#2
Quote from Entropic01 View Post :
I have a PC with an HDMI out. The HDMI out from my PC is going to my soundbar which then goes to my TV.

1) PC with Radeon HD6870 and HDMI out
2) Sony HT-CT100 (1080p capable)
3) Samsung LN4665F (1080p)

HD6870 <--HDMI--> HT-CT100 <--HDMI--> LN4665F

I'm getting video and audio out from my PC to my soundbar and PC no problem. However, if I set the output to my TV at 1920x1080 (1080p) the entire image is not captured on the TV (the edges of the image are clipped).

However if I set the display to 1600x900, I get the full image. So my question is what am I doing wrong to get full 1920x1080p to my TV?
On the controller there should be a zoom option. Change it back to standard view.
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#3
Sounds like a TV problem. On my Samsung, it overscans (cuts off the edges) over HDMI, unless you name the input: "PC". Or use the "P.SIZE" (Picture Size) button to toggle to "Just Scan". The button might be labeled "Zoom" instead.

If underscan (black borders around picture) becomes a problem, turn of underscan in ATI graphics card's settings.

Good luck.
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#4
Oh yea, underscan. This happened to my radeon 6950. I had to go to CCC and change underscan settings. That maybe the problem too.
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#5
Quote from Entropic01 View Post :
I have a PC with an HDMI out. The HDMI out from my PC is going to my soundbar which then goes to my TV.

1) PC with Radeon HD6870 and HDMI out
2) Sony HT-CT100 (1080p capable)
3) Samsung LN4665F (1080p)

HD6870 <--HDMI--> HT-CT100 <--HDMI--> LN4665F

I'm getting video and audio out from my PC to my soundbar and PC no problem. However, if I set the output to my TV at 1920x1080 (1080p) the entire image is not captured on the TV (the edges of the image are clipped).

However if I set the display to 1600x900, I get the full image. So my question is what am I doing wrong to get full 1920x1080p to my TV?
Dude, overscan/underscan problem. All the new drivers for graphic card from both nvidia and ATI have the option to correct for this now. Just open the catalyst control center and look for the option to correct for overscan/underscan or something with TV display.

Here, I did a google search and found the instruction
http://superuser.com/questions/57...rol-center
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#6
Quote from V0RT3X View Post :
Dude, overscan/underscan problem. All the new drivers for graphic card from both nvidia and ATI have the option to correct for this now. Just open the catalyst control center and look for the option to correct for overscan/underscan or something with TV display.

Here, I did a google search and found the instruction
http://superuser.com/questions/57...rol-center
That'll work, but if you're trying to get the best picture quality on an LCD HDTV, you need to disable overscan on the TV side and run the display at it's native res (1920x1080 in the OP's case). Compensating on the graphics card side is an inferior solution (because the TV is still screwing up the picture when it scales it to create overscan).
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#7
You could always go DVI > VGA if you don't mind analog signal.
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#8
Well call me a newb but I had never heard of overscan before. I'll try it when I get home tonight.

Thanks for all the help guys and +4's all around.
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#9
Quote from Entropic01 View Post :
Well call me a newb but I had never heard of overscan before. I'll try it when I get home tonight.

Thanks for all the help guys and +4's all around.
Overscan is a "problem" which makes sense with analog broadcasts and crude CRT displays. The advent of modern LCD displays, digital connections and digital broadcasting SHOULD'VE eliminated overscan issues entirely, but... here we are.

Interlacing is another issue which made sense 50 years ago. Interlacing problems shouldn't exist anymore... but they do anyway. And don't even get me started on chroma subsampling... Smilie
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#10
Quote from redskull View Post :
That'll work, but if you're trying to get the best picture quality on an LCD HDTV, you need to disable overscan on the TV side and run the display at it's native res (1920x1080 in the OP's case). Compensating on the graphics card side is an inferior solution (because the TV is still screwing up the picture when it scales it to create overscan).
The LCD has 1920 x 1080 pixels no matter what you display on the screen. if you get overscan and it cuts off the edges, you're displaying fewer pixels on the same 1920 x 1080, but when you scale down your video adapter to fit the exact 1920 x 1080 on the LCD then you have a 1 to 1 correlation of pixels from to the computer to pixels on the display. The over and underscan is different for every video card. I have an ATI card with a 1080P LCD and mine underscanned significantly. I fixed it in the CCC and now it looks superb.

If your TV has the over/under scan options to change it will have the same affect, but changing on the computer is just as good of a fix.
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#11
Quote from redskull View Post :
That'll work, but if you're trying to get the best picture quality on an LCD HDTV, you need to disable overscan on the TV side and run the display at it's native res (1920x1080 in the OP's case). Compensating on the graphics card side is an inferior solution (because the TV is still screwing up the picture when it scales it to create overscan).
That makes sense. For my TV, there is no option to adjust for this. Tried all the different P.size and what not from the TV but it would always too big or too small. Went online to check and people said u'll have to go through some service menu and change some really crazy settings that could potentially brick ur TV. So I always adjust mine from the PC side
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#12
Few clicks of the remote and changed the TV to "Just Scan" and works perfectly. Thanks guys!
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