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As it tuns out, one of the color wedges in my existing color wheel was completely missing and it took me a while to clean out the glass fragments from the TV case. The new one I ordered from Encompass had a slight chip in it and I had to exchange it for a new one (they are 45 minutes from my home). I swapped out the 2nd new one, put the TV back together, and my TV was buzzing immediately after powering it up.
I figured the color wheel might not be aligned properly or I might not have lined up the rubber gaskets properly. I went throught the color wheel replacement process all over again and made sure the color wheel was installed securely (using the same color wheel). The second time it started up without any issues with a great picture (I replaced the lamp as well). I plugged the TV back in while moving it back into the cabinet and it worked ok. While I was sliding it back into place, the buzzing started again.
I turned the TV off and waited 20 minutes. It started up without issue but started buzzing again after 3 or 4 minutes. It definitely sounds like the color wheel again since it is immediate when starting the TV up and persists for a few seconds as it winds down when powering off. If on for 15-20 minutes, the picture has a faint flicker.
Is this an issue with my install or do you think I might have gotten a bad color wheel?