: All About HDTVs as a PC or Laptop Monitor
Before I exchanged my SA 8000HD PVR for SA8300HD PVR, I had it connected to my Hitachi Plasma TV using a DVI - HDMI cable and it worked. So if your cable receiver is similar to Rogers' Scientific Atlanta, I don't see any reason why it shouldn't. As far as seeing any difference between component cable and HDMI connection, I had a hard time seeing it.
2008-06-09, 12:15 AM
The relevant portion in the link I provided is this:
HDMI is basically DVI plus digital audio. DVI/HDMI is not necessarily superior to component video...
which answered the second question in your original post re: picture quality.
2008-06-09, 02:41 PM
I found that the Sharp TVs provided the worst support for PC inputs. They either did not accept a PC on the HDMI port or limited the resolutions supported on their VGA input. Either way, you could not use the native resolution of the LCD panel. (BTW the 7600 and Nvidia's driver could handle any resolution you could throw at it.)
Check this thread for reference to your or similar Sharp models. And, of course the User Manual. My best guess... Use the nVidia control panel to select an HDTV output (720p, 1080i). Hopefully the Sharp HDMI input will recognize that as a supported resolution.
2008-06-09, 02:48 PM
D62 series Sharp TVs easily take 1920x1080p/60 from a PC over HDMI inputs (I got nVidia Quadro NVS 110M in my laptop with a docking station that has a DVI out).
Solarfish, many 1080p pixel-based HDTV early models did NOT accept a 1080p input signal (only 1080i, 720p, 480i/p). Check the spec of your Panasonic 1080p HDTV model. Note: On pixel-based HDTVs, all input signal formats are converted to its native panel resolution (1080p in your case). Also see: http://www.digitalhome.ca/forum/showthread.php?t=76129
2008-06-10, 02:02 PM
I've tried to recreate the situation several times, but ... nothing but "No Video Signal" now.
Has anyone run into a similar problem??? Any ideas?? Thanx!I have EXACTLY the same problem that you were having, same TV and graphics card. Does anyone have any suggestions or did anyone work out what might have been causing this problem??
2008-06-10, 02:33 PM
Solarfish, many 1080p pixel-based HDTV early models did NOT accept a 1080p input signal (only 1080i, 720p, 480i/p). Check the spec of your Panasonic 1080p HDTV model.
Thanks for the information jlet, the plasma is a TH-42PZ77U, I have checked the manual provided with it and although it confirms that the screen is 1080P with 1920 x 1080 pixels, it does not actually specify what resolution of input signal it will accept.
The specifications mention Input Video Formats of 480p, 720p, 1080i, 1080p, but I don't know if that is quite the same as you are talking about.
Do you have any further suggestions?
I'm a PC guy. I'm a noob to the HT scene, but I'm building up a HT in my soon to the finished basement.
My plan was to build a new computer to be used as a file server for content I already have on my computer.
My plan is to have a PC connected to an AVR, connected to an LCD (and front projector).
Here's my noob question... Why would a HDTV not display a image supplied over a DVI to HDMI cable?
It should be just like an LCD PC monitor. You just set the resolution you want on the PC (in this case 1920x1080) and that's it...Why would it be any different?
The TV doesn't need to know what it's connected to, it just needs a video feed.
2008-06-17, 09:42 AM
Some HDTVs do just that. Others have put specific limitations on their HDMI ports that disable certain resolutions.
It's really up to the manufacturers to decide whether that feature is important or not.
2008-06-17, 02:03 PM
In addition, the TV must send the receiver or the PC information on what resolutions it will accept. Unfortunately, the plug and play standards for consumer electronics (TVs, DVD, A/V) and for personal computers (monitors and video cards) are different. So, the PC might not recognize the TV and the video card will not know what resolutions it supports.
2008-07-04, 03:21 AM
I have an HDTV with ATI 9800 Pro to a Panasonic TC-32LX700 using DVI/HDMI. I'm probably missing something very basic but I get no display during BIOS, etc. until the Windows splash screen. Once in Windows, with the latest ATI drivers, the resolution and display generally are perfect.
Is this an HDMI problem or something else that I cannot get output to display during BIOS, DOS, etc.?
2008-07-04, 09:40 AM
Some HDMI inputs will not recognize the resolution that is sent during the POST/BIOS sequence, which is 640x480.
2008-07-06, 02:12 AM
Thanks. So if 640x480 is not recognized by my Panasonic's HDMI input (and it doesn't have a DVI input), then I take there is no trick or technology to get around this and I will never be able to e.g. troubleshoot my HTPC on that TV? Ugh.
2008-07-06, 10:03 AM
If the TV has a VGA input you could try that.
2008-07-07, 02:42 AM
HDMI, component and s-video inputs only. I don't suppose that using an adapter to go DVI to component or s-video would solve this problem, would it?
2008-07-07, 09:38 AM
You'll probably have better luck with component.
2008-07-07, 06:32 PM
I believe that this is a problem with the ATI card and driver. The DVI-D input on my Samsung 204BW monitor is similar to your HDMI connection. The POST screens are not displayed using the ATI (AIW) card, but show up fine with an Nvidia (7600) card.
My solution is, unfortunately, to keep a VGA monitor for troubleshooting. You could try an Nvidia card to see if that helps.
2008-07-08, 04:29 AM
Wow, which AIW card do you have, the 9800? And which drivers?
In a way it is encouraging to hear that my TV might work with an nVidia or maybe a different ATI card.
2008-07-08, 06:55 PM
This is so embarrassing. An original AIW Radeon. I think it is a 9200. Probably the oldest card that ATI Catalyst drivers still support. On a Gigabyte GA-7DXR mobo. The eVGA 7600GT was a belated attempt to keep it running.
2008-07-09, 03:15 AM
Ha ha! Maybe it's only our fairly old ATI cards that have this problem -- I don't know if you've heard other people with more current ATI models having the same issues.
I sure hope not, since I'm thinking of building a new HTPC and was looking to match one of the newer ATI cards with my Panasonic 32LX700. I guess I'll have to buy from somewhere with a good return policy unless I can definitively get to the bottom of this...