At a TV tech/repair person you stop guessing and go buy the service manual so you can start the repair.
Hi, my samsung TV wont work. When I plug it in to power supply red standy light turns up. There is no voltage output on supply board pins connected to main board (neather 5V stand by. All of them are 0V). Then I press the power up button and red stand by light blinks for several times and nothing happens. No image, no sound, nothing. However now I'm getting voltage from those pins and are according to specifications. Some say you should always get 5V stand by even if TV is just plugged in and off. Which is false in my case but after pressing power on button output voltages are fine. This gets me in doubts whether supply board is an issue or main board. Any help?