Optoma HD20 Problem with Black Snow in Red Areas.
I hope I am posting in the correct forum here...
I have an Optoma HD20 for about 4 years and I LOVE it! Only problem is that recently (within the past 3-4 months), after about an hour or two of the projector operating, any area of the picture that has red (not orange, not pink, but RED) develops little black dots that randomly flicker on and off. There is no particular pattern. It looks more or less like snow, but with only large black spots. If I turn off the projector and come back in a few hours, the problem goes away. It seems to be related the projector heating up.
It appears on 720p or 1080i. I had to change out the color wheel once because it shattered, but I managed to get the colors back into the correct hue after going into the service mode. Also, recently, I tried the "burn-in mode" of the service mode where it goes from red to blue to green to white to black (or some pattern thereof) and let it run for 12 hours. The red is always fine - no black snow.
I am going through a receiver, but after the symptoms appear, I have tried going directly to the projector - problem still exists. It make no difference if I am running from the Tivo, Blu-Ray player, or XBox.
I am using RedMere technology cables, going through 40 feet of cable up through the wall, into the attic/ceiling and then to the projector through an outlet plate coupler. This issue did NOT start when i started using the RedMere cable, so I do not think they are related, but who knows?
At this point, I am weary of purchasing another expensive HDMI cable just to run from the receiver to the projector simply due to cost, but I may have to do so, just to rule out the cables.
The room does get a little warm after a while, but that is just the nature of the heat from the projector. I do have a ceiling fan in the room that is always on, so I know the heat is evenly distributed about the room and not just focused at the projector area.
Has anyone else run into this issue? I have the stock firmware installed (I purchased the unit right after it came on the market).
Thanks in advance for any suggestions.