I suppose that since my ordeal has ended, I should share my experiences with Optoma.
I had the same problem as all of you. I sent in the projector, referencing this thread, and a couple weeks later, it was returned to me. The problem was gone. In addition to replacing the main board, which I'm told is standard operating procedure, they had also replaced part # 75.83F12G001, which was listed as ASSY LVPS TIGERPOWER 200W H72. Does anyone know what that is? It looks like a bulb to me, but I'm not sure.
Anyway, the problem was gone. But in its place were a bunch of really big dust blobs, and these very faint vertical lines.
I called them back, and Mike B. said that it was highly unlikely that the projector would have been shipped out with those problems since their QC is so thorough, but he supposed that anything was possible, and said that I could send the unit back in.
When I received it 2 weeks later, the dust blobs were gone, but the lines were still there.
Mike B. said that the techs working on these projectors were the best in the business, and the odds of them missing this problem were slim to none. I was skeptical, since the problem was very very subtle, and last time, these guys hadn't even noticed a huge purple dust blob right in the middle of the screen. I tried explaining the problem to Mike, but he cut me off and said it was probably something wrong with my end. I told him that the problem existed across all sources and inputs, and he said it was probably a power issue. When I tried to explain why I thought that was unlikely, he cut me off and said that all sorts of weird problems happen when there's an issue with the power. He offered a few suggestions, and I said I'd try them and get back to him.
After successfully eliminating all external variables (including the power), I called back to tell them that it was indeed a problem with the projector. I sent pictures and a very detailed description of the problem. It took them forever to get me a new RMA # and call tag, but I finally sent it back for the third time.
I called to check on the status a few day after it had arrived at their office, and they had no record of the unit. After about a day of this, they finally realized that somewhere along the line, someone had typed in the wrong serial number. But the unit had been repaired, and was in QC.
A few days later, I got it back, and much to my surprise, the problem was fixed.
While I do think that having to send the projector in 3 times is kind of ridiculous, what really upsets me about this whole thing is how every time I called them, they made it seem like I was an annoyance more than anything else. Mike B. was very rude and condescending every time I talked to him. And even Robert, George, and Patricia, who all seemed very nice, never called me back when they said they would, or gave me my RMA #'s when they said they would, or anything like that. I always had to call them back.
And my all-time favorite experience with them was also my last. The day my unit was in for QC I called and asked if it would be shipping out that night (Friday). They said probably not, but I could call back towards the end of business just to be sure. Their offices closed at 5:30, so I called at 5:15. I was put on hold for 15 minutes, at which point, an automated message kicked in informing me that their offices were closed for the evening. Is that tacky or what?