Howdy - first post here but I just wanted to chime in with my experience since all the Google searching in the world didn't yield my exact set of symptoms. Hoping to throw enough keywords into this message to help another fella out someday
My Optoma HD20 was purchased in November 2009, used fairly sparingly, but incrediably loved all the while. About 700 hours in last November, my Optoma HD20 started buzzing loudly at startup. The buzz sound would go away after five minutes, like it was warming up or something (LOL). It acted that way for about 50 hours before it died. So if you have that buzzing sound and you're planning a big party with everyone coming over to watch the game, just know you might only have 50 hours left. The other symptom was an occassional brightness change, not really a color change at all.
Anyway, last weekend I watched the Ravens win the Super Bowl with my immediate family - no party or anything. My wife turned the unit off that night while I was upstairs and it turns out that was the last time it would run. Ironic given the power outage in the Superdome and all.
She's sure it didn't act weird when powering down. No popping or anything. Since that night,, attempts at troubleshooting have all resulted in the indicator lights showing "bad lamp" according to the manual. I didn't think the lamp was bad so I was hoping to simply remove the bulb and put it back in, maybe tricking it somehow to think a new lamp was installed. Long shot, I know. When I got inside the bulb housing, I was surprised to see how dusty it was so that inspired me to open the whole thing up and clean it out.
To open it up, I used a combinatoin of lostsole1976 mesage instructions and a nice YouTube video by capnincredible. Marked the plastic tabs with blue tape, thought I would crack the code and undo the tabs in the correct order to prevent breaking them and become famous in this forum. That failed and I broke one or two
. Looks like the three screws underneath will have to serve to thold the whole thing together when I get it back togehter someday. I don't care about the minor cosmetic problem, so I'm confident in the three screws with my overhead arrangement.
As of tonight (when I dissassembled it), it's clear that I have a warped color wheel and that was making the buzzing. I spun the wheel with my finger, as if I was going to clean it with the Q-tip, and that's where you can feel it rubbing at one point. There's actually a crack radiating perfectly straight out too, which almost looks factory built. but that's unlikely, right?
Anyway, it seems clear the next step is a thorough cleaning and a DIY color wheel replacement using an Official Optoma part. Hopefully they've gotten better in the last three years. Maybe I just got unlucky? I loved the unit, realize all brands are sensitive in general, but I'm a bit perturbed how 4,000 hours of lamp life is woth squat if the othre parts wear away. Not to mention, no authorized service centers anywhere throughout the country.
Any other theories out there? Feels strange that the wheel which was previousoy buzzing but working, just stopped working entirely without any apparent change in condition. Maybe the warp finally got bad enough? Maybe that crack is new? Maybe my wheel is bad AND the lamp is bad (seems in tact visually).
I've ramblied on long enough. Thanks for everyone's input on this forum. - Perry