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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, is the Sceptre x505bv completely / electrically dead?
Still, please post back with clear pictures of the inside of the TV showing these boards. Of particular interest would be the connectors to the AC power cord and the power supply board.
Appreciate the post back and images.
With the unit unplugged, what are the resistance readings between the 2 legs of the green disc left side near the AC INPUT connector? ...how about the fuse F1?
With the unit plugged in, is there 120V AC between the blue and brown wires? ...how about 180V DC between the 2 legs of the big capacitor?
A friendly reminder: voltage measurements by its very natures requires that the TV be plugged in and therefore LIVE! Please exercise due care and caution.
Were you able to locate fuse F1? ...right of the AC INPUT connector.