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HDMI Cable Questions

gadgetdude
12-26-2009, 07:32 PM
I recently built a new desktop PC using a Radeon 5850 card that has dual DVI and HDMI outputs. I have it hooked up to a Dell S2409W LCD monitor via HDMI (6 foot cable) because I have another computer connected to the screen via DVI. Everything works as it should and I could easily switch between the two systems with the input select button on the screen.

The problem has come about when I switched to a 10 foot HDMI cable (because the 6 foot cable is really not long enough for where the desktop machine is). The image looks perfect with the 10 foot cable but when the PC's power settings tell the monitor to turn off after x minutes, instead of the monitor "Entering Power Saving Mode" and going on standby like it should and does with the 6 foot cable, it flashes "Lost HDMI signal" and does not go into standby. The behavior is exactly like what happens if I simply unplug the HDMI cable from the PC. I have switch between the two cable and verified that the 6 foot cable works exactly as it should but 10 foot cable will not put the LCD into standby mode (so it would appear it's not a setting on the PC or monitor).

So my conclusions that there are a few possibilities and was wondering what some of you thought:

1) Simply a "bad" cable?

2) Could the length be the issue? I thought I read that HDMI cables could be 25+ feet or longer without any kind of a amplifier.

3) Maybe the 10 foot cable isn't HDMI "compliant" in some way? I bought it through Amazon and it is suppose to be a Cables Unlimited PCM-2295-10 which from the Cables Unlimited site says it is HDMI 1.3 compliant.

4) More interesting is maybe it isn't a Cables Unlimited cable but some kind of lower quality knockoff? Here's the item I ordered from a 3rd party vendor through Amazon for ~$7.

I was planning on contacting both the vendor and Cables Unlimited to get their reaction as well as maybe try a few 10 foot cables I have seen locally ($25-$30).

Any thoughts?

Lee Stewart
12-26-2009, 08:22 PM
Hi and welcome to HDF :hithere:

It isn't a distance problem as you correctly surmised. Too short an extension - 6' versus 10'

HDMI cables are digital cables so they either work or they don't. And yours is working when a signal is passing through it.

You say you are using a switch? Was this added when you added the 10' HDMI cable? Was it added and working properly but there was only one connection (the 6 footer)? Which switch are you using? Switches can cause headaches with HDMI cables. To test this - unplug the 6 footer leaving only the 10 footer.

gadgetdude
12-26-2009, 09:26 PM
No switch - both PCs are directly connected to the monitor (the monitor has both an HDI and a DVI connection, as well as a VGA that I'm not using).

oblioman
12-27-2009, 12:06 PM
No switch - both PCs are directly connected to the monitor (the monitor has both an HDI and a DVI connection, as well as a VGA that I'm not using).

have you tried switching the cable around? simply do a 180 with it and see if it reacts differently.

gadgetdude
12-30-2009, 02:25 PM
Fixed: It was definitely the cable. I picked up another 10 foot cable from the local Mircrocenter for $17 and it works exactly the way it should. I switch back to the questionable cable one last time and verified that it still would not properly signal the LCD to go into standby mode (same old "no HDMI signal" message).

It is a weird one because the "faulty" one does provide perfect picture and sound. The only other difference I can see is that the new one does specifically indicate that it is HDMI 1.3b compliant - maybe there is something there. Keeping the old one too - it seems to work fine hooking a Blu-Ray player up to another screen.

Thanks

Mylesjen
01-04-2010, 10:01 PM
Maybe there is a difference between cheap cables and more expensive one's.

Loves2Watch
01-04-2010, 10:31 PM
Maybe there is a difference between cheap cables and more expensive one's.

Nope, there is not...