A relative has given me a dead 46" LED-lit Samsung (UN46C6300SFXZA). He wasn't sure what exactly killed it. He had a service tech come by who may have assumed it to be a surge, as it was plugged directly into the wall.
It won't power on. If you hit power, the screen just remains black and you can hear a relay clicking off and on attempting to bring it up.
The tech gave him an estimate, and from what I can make of it, he tried replacing two boards, but stated that it would need a third, which he must not have had on hand. With all three plus service, the estimate was then too high to justify fixing it. From the receipt he left, it looks as if he brought the mainboard and power supply boards with him, so the T-Con is all that would have been left, though I'm not sure about how far into it he got.
According to a web post I found about a similar TV, if the T-Con board was at fault and its ribbon were then disconnected from the mainboard, the clicking should stop and the TV should power up. If not, there is likely a problem with the mainboard. Unfortunately, disconnecting the T-Con changed nothing here and it kept clicking.
Does that procedure sound valid for this particular model, and if so, where would I go from there? The post I saw went on to describe a way of simulating a "turn on" command by jumping some pins together, as well as checking for a standby voltage, but again, it was for a different model.
FWIW- All three boards look to be in perfect condition, as do all electrolytic caps on the power board. They're too high voltage for my ESR meter, but I'm guessing its not one of the simple Samsung cap failure deals.
If anyone can offer any assistance on this, it would be much appreciated.
PS- Don't ask me why the tech would estimate and bill him for three replacement boards after determining that the first two weren't the cause of it. It didn't make any sense to me either, but that's also why I'm not certain that he actually swapped in the first two or that the mainboard can definitely be ruled out as a culprit.