I have a RCA 55” LED LCD FULL HDTV 55C55R120Q

skywalkerspawn  this”the main power board, the logic board and the led driver board “ sounds like you replaced the power board, main board and I am not sure what you are referring to as the LED driver board. Your set has a T-con board. Most t-con boards are fused, you should check that board as well. After that, you really do not have any other boards left so the quick flash etc. could be a failed backlight array. Measure the output from your power board to the array and see what the voltages show and if they are consistant or if they go up and down. At the LED + pins you should get ~ 132V when you turn it on. If ithat voltage drops quickly than it is most likely your LED backlight strips. It’s best if you post some good pictures of all of your boards and the complete layout with wiring. Post those with your question. That way we can see what you see and can hopefully help you further in getting this fixed.Aggiungere immagini ad una domanda