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If your tv is around 2-4 yrs or used 6000-8000 hrs,never replaced the lamp before it could be time to replace it.If you hear strange noises like buzzing or humming noises it could be the color wheel which is a little disc that has a gamma of colors and spins at high rpms.When the light of the lamp goes through it creates the colors on your tv.The other most common failure is the board that powers the lamp,which is called the ballast.When its bad it will make a clicking sound or like wanting to turn on.Your part # for the lamp is 265866 and you can find it here: http://www.discount-merchant.com/RCA-265866-265919-269343-271326-270414-Lamp-p/rca-lamp-265866-26591-269343-r.htm Good luck and blessing for your house!
That part is on national back order with no projected date of when it will be available. However you can get your color wheel rebuilt at the following link and they are fully guaranteed. Heres the link http://servicemanuals.vstore.ca/
GET rid of that TV it's a piece of JUNK! I had A 50 inch dlp color wheel went than the lamp the the digital circut board went and they want $600 for a new board . Not worth fixing(if by some miracle you can find any parts) sell the parts and move far away from anything with RCA on it. My new pioneer 5010 plasma is AWESOME!! $2600 tiget direct.
Buzzing is usually indicating the color wheel is defective. Or it could also be the lamp fan malfunctioning as well. My quess would be the color wheel as thats a fast moving part which is prone for bearing failure.
You have the ATC 332 chassis you can get the service manual at the following link and that will explain how to tell if the color wheel is bad. heres the link they will email the manual to you within minutes. Its listed under the RCA catagory on the left side. http://servicemanuals.vstore.ca/