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RCA HD50LPW42 50" Rear Projection HDTV - Page 9 Questions & Answers
RCA LED55C55R120Q PUSH POWER BUTTON MULTIPLE TIMES TO TURN ON
That has to be one of the longest questions I've seen on here but unfortunately it doesn't help figure out what's going on, you've replaced the power supply a couple times, but you didn't say anything about testing the 5 and 12 volt rails to see if you have the correct voltage and if it's free of ripple. Have you tested the "on pin" on the power board to see if the power supply is being commanded to come out of sleep mode and turn on? Another thing to test is the on command to the main board, I'd have to pull a service manual to see what it should be but generally it's around 2.5 volts on most Funai brand sets. To be able to repair a TV it generally takes some electrical engineering knowledge and takes more than just replace some boards and hope it helps.
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