@kumaran123 … if you dont have the ability to test with a known good, only other option is to have the schematic and test using your multimeter. other than that experience will sometimes help rule out other possibilities, but nothing concrete like replacing suspected part with known good or having schematic to check values with multimeter.
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try typing your model number along with schematic or wiring diagram on google and see what you find. this will tell you what voltages should be present on any part of any device that you can check against your multimeter to find any fault.
@kumaran123 … if you dont have the ability to test with a known good, only other option is to have the schematic and test using your multimeter. other than that experience will sometimes help rule out other possibilities, but nothing concrete like replacing suspected part with known good or having schematic to check values with multimeter.