How about, the screen is LED 39 ", the fault has been progressing, it turned on the second or third attempt, the indicator LED flashes, then it turned on the same but until the 6th or 7th attempt, the last time it turned on suddenly the image froze and it went off by itself and began a cycle of trying to turn it on and off (never gives an image), this cycle is only interrupted when disconnected from the AC. I have barely begun to check, I already did the test to disconnect the signal cable and turn on perfectly the LEDs of the screen, there are no capacitors in poor condition at the source or inflated, they have been measured with capacitometer and the values are correct, I am in the Mexican province and it is not easy to find diagrams.

Hello, Rogelio, welcome, what you tell me brings back memories ... I throw you a center with the hope that you do a great goal This Samsung drove me crazy, I end up being the connector of the source where it connects to the main, this family of sources fails the connector, check with a magnifying glass if it is your case in search of the black dots of the connector, look at the last image of this topic https://yoreparo.com/tv/televisores/lcd/preguntas/1574316/samsung-t27a550-no-arranca Tell us your results