Originally Posted by Oakheart
I just fixed one by replacing the the thermal paste at the dmd chip and cleaning the fans and color wheel motor. There are some issues in thread with the color wheel's timing mark causing the flashing.. Honestly, it's one of three things. Your lamp has died, the lamp safety switch is not engaged or the ribbon cable that goes to the front IR sensor or a fan cable is not correctly plugged in to the main board. Here is a slide show showing the thermal paste repair and cleaning.
Oakheart, thanks for posting this link. I've got a couple of questions for you:
-The thermal paste that you used looks fairly generic. Is it similar to thermal past you'd use for a PC CPU ? I have a couple of varieties of Arctic Silver that I could use. Do you think those would work well?
-How many hours do you have on the unit that you changed the thermal paste on? Any issues so far?
Here's the background on my issue:
I've had an HD20 for a couple of years. I started getting the color change/flickering issue about 2 years into ownership. I didn't deal with it at the time (as it was out of warranty) and went back to using my old HD70 (which has never skipped a beat). Recently I decided I wanted to go back to a 1080p projector, and try to fix the HD20 issues.
About 2 months ago I did a thorough cleaning of the HD20, based on tutorials I found online. I felt like I got most of the dust out, and the flickering issue went away for awhile. Fast forward to about a week ago, and I noticed the color/flickering issue happening only with 24 Hz BD video. Switching back to 60 Hz made it go away, so I just lived with 60 Hz video, no big deal. Now today as I'm watching broadcast TV (both 720p and 1080i), the color/flickering issue has come back. Switching to high altitude mode corrects the issue so far, but it seems like this is a temporary fix at best.
I'm a little annoyed that the flickering issues came back so soon. I had expected to go at least 6 months before having to do another cleaning. Do I just need to do a better job in my cleaning? This projector does get a lot of use, as it is my primary display.
I'm probably going to clean out the dust again and re-apply fresh thermal paste in the next couple of days. I don't really want to clean the projector out every 8-10 weeks, so hopefully the thermal paste helps solve the heat issues this projector seems to have.
Any thoughts or help is greatly appreciated.