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the d52w20 rca chasis itc222 can be difficult to troubleshoot sometimes. there a few things you can assume at this stage. ONe it is NOT the fuse. The processor in this set is seeing a voltage or saftey shutdown issue. and is shuting the set down for saftey. THis is where the troubleshooting begins. High voltage or overcurrent conditions are generely the problem. \technicians have speceil computer diagnostic equipment that can read error codes in the processor. much like in a car. but without it yo0u pretty much have to check things like horizontal ouput transitor.
57 inch rca....Sounds like you have a itc222 chasis but cant be sure... what is your model of the set. d52w20 maybe.. or something simular.. blinks green 3 times sound familar... get me that model number and we cant start the troubleshooting process