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Sounds like it could be the power supply. Try changing the brightness of the screen and changing picture modes like movie or standard. If this causes the flashing to change in severity, it will most likely be the power supply board
IF you would like help diagnosing your set. Go to the enclosed link. They have the service manual for your set and offer unlimited chat support for only 29.99. Just click on your sets manufacturer and you will see your model. Then click on the contact us link and provide your email address and they will email your manual and instructions on how to obtain your support. I am one of their techs. This manual contains step by step procedure for troubleshooting Your RCA DLP Light Engine http://servicemanuals.vstore.ca/
On the back of the TV, you'll find the Access door to your lamp. Unplug the TV from power, and remove the screw on the access panel. Inside you'll find 2 additional screws holding in the lamp housing assembly. Remove the screws, then the lamp assembly and visibly inpect it. You'll know if the lamp is defective, it will have obvious damage. If so replace with part # 260962, you can acquire this lamp for arround 100 dollars off ebay, or 262.00 direct from RCA.