Hello everyone, I have a Samsung TV model UN40EG5050F which only remains with the red stand-by LED, but does not turn on, or with the control or pressing the button. I have checked the power source and I see that in the 5v line I only have 2.9v, and in the 13v line I have 8.3v, I have searched for shorts or altered parts but I have not found anything, well ... what I have found is that The earth output of the integrated SLC2012 seems to be open or deactivated, since the voltage of the LEDs is 70v approx. But in the drain nothing, I tried putting him negative with an alligator and they didn't even light up. I have also seen several cases here exposed and I have done some steps that are said but none have worked for me, for example: I have connected the power source only with the LEDs, but they never turn on, I have checked filters, diodes, resistors, but Everything seems to be fine, I have changed capacitors, the main mosfet, the optocoupler, even the 2s110 but nothing, neither the LEDs nor anything else turns on, just stand-by. Sorry if I have lengthened a lot but I try to be as specific as possible, by the way, the source is: BN44-00496A, thanks in advance.

Friend, according to what you explain, the secondary voltages have been reduced, it may be due to a link on the main card, but first try to change the large capacitor, the one that goes to the source on the primary side, maybe it is drying and that causes the failure and if this good. you have to check the main card you may have a lucky diode leak

Hello, the source has only two resistors, one of 100k and another of 0.22ohm or something (it does not reach the ohm); Both are correct. I have already changed the input capacitors as well as the only optocoupler that has and remains the same, with 2.9v on the 5v line and 8.4 on the 13v line, that without a load, with a lower load even more. Something that I have noticed is that the voltage varies a lot from the primary mosfet, that is, from 0v it goes to 180v, then it goes back to 0v and goes up to 40v, it goes back down, so randomly, that's why I changed the mosfet and even the 2s110 thinking That was what failed but nothing. I know it is a pulsating current but I notice a very large variation, that same variation I see in the secondary where from 20v goes down to 13v then goes back up to 20v then goes to 0v and the process is repeated. Unfortunately I do not have an oscilloscope to see more exactly what happens, well, I will keep looking, whatever contribution you have, I appreciate it.