Hi Jhun,
As a general rule as soon as you switch on the TV, the power supply must produce stand by (sb) 5V or 3.5V as per the TV's design. Next, when you give power on command, the power supply should produce power on 5V or 3.5V, 12V and 24V or some other voltages as per the TV's design. All this is printed on the power supply pcb in most TV sets. I hope this helps.
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