Good day..
That problem is usually cause of bad capacitors on the power supply section..
As you stated your TV works fine and after a minute the red light comes on...
That
symptoms is cause of bad capacitors..Normally bad capacitors can check
visually if the capacitors look like leak/bulged on the top that is the
indication of bad one but not all bad capacitors are bulged some are not
so in that case you have to used a special meter called capacitance
meter..
This is the sample picture of bulged capacitors:
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