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The problem I recently encounter sounds very familiar to yours. I have the HL-S4666W so a similar model too. I've replaced everything lamp, ballast, and color wheel. All of which do absolutely nothing for me. I've started to get a really high pitch whining, comes from somewhere near the color wheel ...

Well looks like i'm throwing in the towel, this DLP has defeated me and my wallet. I've replaced it all lamp, color wheel, and ballast, and still nothing. Not even close, so if anyone needs two bulbs, two ballasts, or two color wheels i'm gonna part out my tv unless someone buys the entire thing.

should it be a steady 15k VAC? Or is there an initial jolt and then it drops down?

So i started a full scale debug last night, kind of trying to find something obviously wrong. Does anyone know the voltages that the ballast should output at certain times?

It's definitely not my lamp cover switch, I bypassed that and still have the same problems. All the fans are spinning nicely.

I am experiencing the same exact problem with the HLS-4666WX. I also did the bulb and color wheel and still nothing. It seems to make a high pitch noise ever since replacing the bulb. Problem started with the TV turning off and giving me the bulb replacement error (3 blinking lights). But it would t...