The issue is with 2 capacitors on the power supply board, where the solder connection fails, possibly due to thermal expansion. Taking the TV apart, resoldering the capacitor legs and putting everything back together can be performed in under 30 minutes.
Step 1: Disassembly
2.) Remove small bolts in the middle section
3.) Pull up & away the back cover
4.) Remove the metal cage around the power supply board
5.) Unclip all electrical connectors and remove the power supply board
Step 2: Finding and fixing bad solder connection
2.) Flip the board and locate their respective solder connections
3.) Fix the failed connection using some flux + more solder
4.) Reassemble in reverse order and you are done!