Hello
This looks like a colorwheel symptom, does the sound is like a mechanical sound? high pitch sound? winding, whirling or screeching noise ? well if this is the color wheel, what i think it is, it seems that it is not working properly when this happens the DMD board recognizes that it is not spinning at the correct RPM and turns off the Tv for sercurity reasons, so if you want to replace this yourself what i recommend you to do is to open the back of the Tv and search for the colorwheel it can have missing parts or it could be shattered or it could not spin correcty, hope this info. can help you.
It sounds like the problem is coming from the color wheel here is a instructional guide on how to replace it if you are planing on doing this on your own good luck
http://www.fixyourdlp.com/guides/samsung/bp96-01579a.php
SOURCE: Samsung DLP HL-P4663W - loud whistling noise while the TV is on
That most probably seems to be a future issue with your color wheel, it's starting to go out, you need to identify which one you have before you purchase one, there are two kinds, one with a gold bearing and another one with a silver bearing
SOURCE: Obtain repair manual for Samsung DLP projection TV's.
You can get the service manual by download link within minutes from the following link. Just scroll down the page and you will see your model listed.
http://www.tvrepairworld.com/service_manuals
Testimonial: "Your solution was very timely and helpful. Thanks"
SOURCE: Samsung HL-P4663W/HL is making a buzzing noise
Color wheel needs replacement is the most likeliest cause.
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