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[solution not found] HDMI TV as monitor / HDCP handshake problem?

post #1 of 7
Thread Starter 
Edit: I was not able to resolve the issue between the LG HDMI TV and my PC. In the end I simply purchased a new display, an AOC DVI PC monitor, thus avoiding the problems that seem to be associated with trying to use HDMI TVs as PC displays, and gaining a ton of additional resolution as a bonus.

I may no longer need a fix to this issue, but if anyone finds a working solution in the future, they are welcome to post it here anyway. Hopefully it will help someone else! smile.gif


I've recently hooked up my 26" LG widescreen TV (26LG30D) to my rig (in sig) via HDMI, and I seem to be having a few issues getting it to work properly. Also, forgive me if this has been answered previously; I did search the forums but wasn't able to find a solution which worked.

Basically the problem is that my PC doesn't detect my TV. When I first connected them via the TV's HDMI port #1, it detected fine and worked well for about half a day, then after rebooting and messing with the wires a little during a desk layout modification, the PC was unable to detect the TV. I checked the wires were all connected, and everything seemed fine, but it wouldn't work.

When I switched the connection to the TV's HDMI port #2, the PC was able to detect the TV, and it worked fine for several days. However, when I booted up today, I forgot to turn the TV on before turning on my PC, and now I'm having the exact same problem I was a few days ago.

The solutions I have tried so far are:
  • Disconnecting the TV from the PC, rebooting, shutting down, turning off mains power to both TV & PC, powering on again, reconnecting & rebooting
  • Resetting the TV to its factory settings
  • Changing to a different HDMI cable
  • Running Rigorous Display Detection on the nVidia control panel
  • Trying to set 'Force Television Detection on startup' via the nVidia control panel (option is ghosted and I'm not sure how to enable it)
  • Running the Detect Hardware wizard in the Windows control panel
  • Switching back to HDMI port #1 & repeating all of the above
  • Reinstalling/updating graphics drivers
  • Connecting with a DVI->HDMI cable
..none of which have had any effect. The TV turns on fine, connects fine with other devices through the RCA ports, and other than the HDMI issue, operates as expected.

The only lead I have so far is that it might be some kind of problem with the HDCP handshake between the graphics card and the TV. Based on search results from Google, HDCP handshake issues are very common between TVs and other devices, but if that's what's happening here, so far I haven't been able to find a way to confirm it.

I'd appreciate any help anyone could offer as I'm at a loss as to how to resolve this issue. At this point I'm close to giving up on the LG and simply buying a new DVI monitor, which would solve some other issues as well (like giving me much better resolution than the native 1366 x 768 of this LG TV). But I figured I'd try here before splashing out a few hundred dollars on a device with a better disposition. tongue.gif

Thanks in advance!
Edited by GameDev - 8/17/11 at 6:26am
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post #2 of 7
Thread Starter 
bump.
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post #3 of 7
I can pretty confidently tell you it's not an hdcp issue. Your computer will output to a hdcp and non hdcp compliant device. You will have problems playing a bluray or a few other types of 'HD' media if you do 'not' have an hdcp compliant card/monitor.

The usual issue with HDCP compliance is having more than 2 hdcp devices downstream from a cablebox.

As far as why it's not working, hard to say, have you tried the dvi>hdmi converter that came with the cards?
post #4 of 7
Thread Starter 
Quote:
Originally Posted by djames;14584265 
I can pretty confidently tell you it's not an hdcp issue. Your computer will output to a hdcp and non hdcp compliant device. You will have problems playing a bluray or a few other types of 'HD' media if you do 'not' have an hdcp compliant card/monitor.

The usual issue with HDCP compliance is having more than 2 hdcp devices downstream from a cablebox.

As far as why it's not working, hard to say, have you tried the dvi>hdmi converter that came with the cards?
The cards came with no such converter. They each have a HDMI slot and each came with its own HDMI cable, so I simply used one of those cables to connect the TV.

The only HDMI device connected to this rig is the LG TV. The ViewSonic monitor is designed for use as a PC monitor and therefore uses a standard DVI connection. Of the two displays, only the LG has presented any connectivity issues.

Note that this rig is not what I'd call a media center, it's more of a gaming/workhorse rig. There are no laptops, consoles, mobile phones, apple i-media or any other devices which I'd consider capable of causing such a conflict. The only non-typical device connected to this rig is a very old stereo, connected only through a mini phono jack to twin RCA converter cable plugged directly into the motherboard's line out phono port.

What seems most strange to me is that this device has operated fine twice before with the same configuration, but now does not. I know from the TV's input menu that the ports on the TV are detecting a connection, but the PC doesn't appear to be detecting the TV, and I suspect that this is the main cause of the issue.
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post #5 of 7
dvi > hdmi cable. win
 
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by Tadaen Sylvermane;14594346 
dvi > hdmi cable. win
Just tried doing that, it had no effect.

I'm guessing that LG TVs are simply not compatible with PCs. Guess I'll go buy a real monitor instead.

Thanks for trying, guys.
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post #7 of 7
did u buy a new tv or monitor yet? did you look at the type of hdmi cable your tv or pc uses as not all hdmi cables are equal. 1.3a...b....1.4 ect
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