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Got it. Once I started thinking about it, I realized my TV is about 4.5 years old and I have never replaced the lamp. Time flies. I just ordered a new one. If that doesn't fix it, I'll try the ballast next. Thanks again for the help.

For what its worth, I completely removed the lamp from the TV and powered it up again and was getting the same exact result (rapid high-pitched sound). I did not see any physical damage on the lamp, which I realize is not a sure indication of failure.

Thanks for the info. From reading some other posts, I was starting to convince myself it was the color wheel. I noticed you skipped that possibility, so are you relatively confident that is not the issue?

Here is the description of the problem I am having with my HL-S4666W. I am trying to determine if its a lamp, color wheel, or ballast issue. The TV is a couple of years of old, which I realize is the age the lamps start going bad. When I turn on the TV, I hear a click (which from what I read may be ...