Will not power on..i replaced power board and it did not fix the issue

Monty Thurber  we need to get more details from you. Let us know what exactly happens when you try to turn your TV. Also, make sure that you have power on the outlet and that you connected everything properly. Use a multimeter and check for power to the fuse on the power supply. Let us know if you have power to it. If your power board gets power you may have to check the button bar/on-off switch etc. Let us know what model your TV is (Samsung 60" LED TV UN60FH6003FXZA ?) and post some good pictures of your boards with your question.

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For now it could be the on/off switch, the power cable or the main board, but we need to see those to try to help you diagnosing it.