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The PS-on has to be triggered by the main board. usually 5V or 3.3, just depends on the TV. I repair TV's most every day. That is how I test power supplies when they are not in the TV. Jump the 5V to the PS-ON terminal to trigger the PS to turn on. Then I test voltages to make sure it's working correctly. That's how every TV guy I know does it. I suggest looking at the Coppell TV repairs web site. look at the blog section on the repairs that he has done. he also shows how to test the PS in the way I describe. This method works for me.
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