Chosen Solution
I have a samsung 55". Red light goes on for about 2 seconds then shuts off n keeps resetting in that pattern. Changed the power supply but it didnt help. No lights in the screw holes
bossman71580 we would need to know your exact model. Since you have a new power board, the quickest way to test situation is by disconnecting the main board from the power supply board. Once your TV is turned on, your backlight should come on ( you should see some lights in the screw holes with the back cover off) If you do not it is possible that this is because your main board is not “telling” the power board to turn it on. It is also possible that you have a failed backlight array. Check the VDC on the LED connectors going from your power board and let us know what voltages you get. It might help if you post some images of the different boards as well as the interconnect wiring. Adding images to an existing question
