Optoma HD70 - Problems with long HDMI cables? - AVS Forum
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post #1 of 4 Old 05-12-2009, 06:00 PM - Thread Starter
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PC is using an 8800GS Video card with dual DVI. I have tried multiple DVI/HDMI cables, and I think it's just the overall cable length that's killing it. I was hoping to get some suggestions here.

Current setup

8800GS --> DVI to HDMI Cable (3 foot w/ferrite cores) --> HDMI Extender (passive)--> HDMI Decore Style Wall Plate --> 50ft 22AWG HDMI Cable --> Optoma HD70 projector

Products Used:

3ft HDMI/DVI Cable = Monoprice #2661

3ft HDMI Cable = Monoprice #4023

HDMI Extender = Monoprice #2849

HDMI Wall Plate = Monoprice #2730

50ft HDMI Cable = Monoprice #2804


What I've tried:

-Removed HDMI Wall plate and tried PC --> 50ft Cable --> Optoma HD70

-Tried with 3ft HDMI/DVI --> Extender --> 50ft Cable --> Optoma HD70

-Tried with 3ft HDMI/DVI --> Wall Plate --> 50ft Cable --> Extender --> 3ft HDMI --> Optoma HD70

System works fine if I plug in a shorter cable. However, people seem to use these cables without a problem. I am not sure if the cable is defective, or if the projector just doesn't like it.

I am thinking of switching to HDMI CAT5e/CAT6, I plan on running the cables and testing before I go installing it in the ceiling.

Here are a few questions I have:

-Do you think the 8800GS being DVI is going to affect the problem (it works with a shorter cable, used it with a 12 and 20ft, no problems)

-The Optoma doesn't remember the ID of the device it connects to, from what I read, it uses a psuedo hdmi port (doesn't support plug and play like a normal monitor), i think it's called EDID or something.

-Has anyone else had problems with projectors and long runs of cables, specifically the optomas?

-I have the latest Nvidia drivers, and I can't dig up an Optoma HD70 driver, although I've had it before since I did install it at one time. However, it has the last optoma driver i put on it and it works with a shorter cable.

I'd really like to get it to work but running out of ideas. I am satisfied with all the other monoprice products, and I'll just return the stuff if it doesn't work out.

Input is appreciated...

Thanks,
Darren
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post #2 of 4 Old 05-12-2009, 09:51 PM
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What is going into the optoma, 720p signal? The constant transfer from cable to extender/converter might be affecting the signal.

I use a 35 ft monoprice HDMI 22awg, and it sends 1080/24p to my HD70 with ease. Never had a dropout.

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post #3 of 4 Old 05-12-2009, 09:58 PM - Thread Starter
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What are you using for an output source? HTPC as well? I have no problem with a shorter cable, but the most I've tried is 20ft.

The output from the PC is set to 720p in the Nvidia control panel, refresh 60hz, 1280x720.

I tried it with and without the extender....

No clue what the deal is.
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post #4 of 4 Old 05-15-2009, 11:16 PM - Thread Starter
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switched to hdmi over cat6, works great
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