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HDTV can't run widescreen resolutions when connected to PC

post #1 of 5
Thread Starter 
Hello, folks.
Ive been having a veeeery annoying problem lately. My HDTV, which is an LG 32LH3000 (firmware - 3.40, though it's been flashed to enable the USB port), can't run widescreen resolutions when it's connected to my PC. The card I'm running is in my sig - an XFX HD4870x2, which only has 2 DVI ports. I'm using a 15-pin VGA(or RGB, whatever) cable, which is connected to my graphics card via a DVI->VGA adapter and via the VGA port on my TV. The resolution can't be set higher than 1600x1200 and NONE of the widescreen resolutions work - I simply get the "no signal" message.
I had the same problem when I was running a Club3D HD4670 AGP card on my s478 P4 rig. That one was connected directly; there was no need for any adapters, since it also had a VGA port. I've also tried different drivers without success.

I have read some articles on how the VGA cable might be the limiting factor, but here's the catch: while I was still running my old P4 rig and a Sapphire Radeon 9600 PRO, I could run at widescreen resolutions without a hitch (sure, 1080 was too much for the old turd to handle, but 720 ran beautifully).

So, converting all this blabber into coherent questions:

1) Why can I no longer run at widescreen resolutions, though I could do that just fine while using ~8 year-old hardware?
2) Why can't I go past 1600x1200, even though the VGA cable limitation is so much more than that?
3) What are the possible solutions?
3.1) If I only need a cable, what kind should I get? I already have a spare HDMI-HDMI cable, but my card only has DVI ports, so would a DVI->HDMI adapter be fine, or should I get a solid DVI-HDMI cable? My TV has 3 HDMI ports, a VGA port, a component port, an RCA port and 2 SCART ports, if that's of any help.

Thanks in advance!
Edited by Hyoketsu - 8/19/11 at 2:14pm
     
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post #2 of 5
I would ditch VGA and try DVI to HDMI. I believe HDMI and DVI signals are identical, HDMI can just carry audio as well. (Some DVI can also carry audio). I don't think it matters if you use an adapter or a DVI to HDMI cable. But I could be wrong...

I think the VGA is your limiting factor. From what I remember VGA can go above 1600x1200 but it lowers the frame rate by doing so. I don't think it is worth it.
    
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post #3 of 5
Thread Starter 
Thanks for the input!
Any other opinions?
     
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post #4 of 5
Quote:
Originally Posted by Epitope View Post
I would ditch VGA and try DVI to HDMI. I believe HDMI and DVI signals are identical, HDMI can just carry audio as well. (Some DVI can also carry audio). I don't think it matters if you use an adapter or a DVI to HDMI cable. But I could be wrong...

I think the VGA is your limiting factor. From what I remember VGA can go above 1600x1200 but it lowers the frame rate by doing so. I don't think it is worth it.
I agree with this. It'll make things simpler.
post #5 of 5
Thread Starter 
Success - bought an adapter, connected the hardware via an HDMI cable; everything works fine.

However, I'm still puzzled as to why my old 9600 PRO (and my craptop, for that matter) have no difficulty in outputting widescreen resolutions while using the same good ol' VGA cable
Any ideas?
     
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CPUMotherboardGraphicsRAM
Pentium 4 HT Northwood 3.4 @ 3.5GHz ASRock P4i48 Club3D Radeon HD4670 AGP 1GB 2x1GB PQI DDR400 
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Creative Inspire T3100 PS3 controller 
CPUMotherboardGraphicsRAM
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