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I haven't worked on an RCA DLP but have on Samsung DLP, based on your description it sounds like the color wheel is bad. Take the back off and turn on TV make sure its not a fan making the noise ,but most likely its the "wheel" it is inside the light engine probably right next to where the lamp is plugged in. If the whine comes from this area definitely the wheel.
Pull the front cover off at the bottom. You will see a panel which has to be removed using a screw driver. Inside you will see the lamp assembly. It is a removable box. The lamp can be changed out by just changing out the connections on the new lamp. Before you pull it though try reducing your picture size to 4:3 it helped us to get a little more life out of our lamp.
Its sounds as if the lamp has exploded or the color wheel has. I will post a link to a site that has a trouble shooting manual on CD called RCA DLP Disc #1 which covers every DLP in the ATC line which is what your model is. They have it either in cd form or they will email it. Its a very good resource for fixing your own set. http://servicemanuals.vstore.ca/
Sounds like it could be the entire light engine. The part is available on the Internet, but it runs $700 - $1200 without the lamp (although it sounds like you could use your existing lamp without a problem). These parts, however, are notoriously hard to find and may be backordered for months.