Possible that the TV has a short or faulty circuit in the main board. So it is important to have a check on the main drivers of the mother board , look for faulty drivers, faulty electrolytic capacitors that are short or faulty semiconductors
You must disconnect the SMPS and then check with the main circuit using a multimeter looking for the power circuit. Check if there is possibility of dry soldering- a tap on the board can confirm.
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