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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, what was/were the symptoms ? Is the TV completely/electrically dead?
Great on the DIY (do-it-yourself) repair approach!
Please post back with clear pictures of the back of the TV showing the different boards. Of particular interest would be the power supply board.
This would serve as common reference.
Appreciate the pictures.
With the TV plugged in, is there 120 Volts AC on the black and blue(?) wires to the power supply board bottom right corner?
A friendly reminder: voltage measurements by its very nature requires that the unit be plugged in and therefore LIVE! Please exercise due care and caution.
With the TV unplugged, can you please check the resistances of PR501, R411, D401 preferably out-of-circuit ?