Hve a hisense 40inch led tv set is dead no power led on .nothing blown on power circt.Which is the quickest way to trace if the main pcboard is faulty?

WITH NO LED STANDBY LIGHT...I WOULD BELIEVE IT IS THE POWER SUPPLY. IF YOU CAN DO IT SAFELY, TRY THIS. SOME FUSES WILL NOT LOOK LIKE A CONVENTIONAL FUSE. ON THE BOARD A FUSE WILL HAVE A LETTER F FOLLOWED BY A NUMBER,CHECK THESE. LVDS CABLES ARE THE RIBBON TAPE CONNECTIONS. THESE MAY BE REMOVED, SPRAY A CHAMOIS STICK AND CLEAN THE RIBBON END. CLEAN THE ACTUAL CONNECTION ON BOARD. yOU MAY HAVE TO LIFT A SMALL CLIP UP TO EXIT RIBBON CONNECTIONS....BE CAREFUL HERE, THEY CAN BREAK. REPLACE AND POWER UP AND SEE IF A STANDBY LIGHT COMES ON. WITH A VOLT METER SET A 200 VOLTS +. PLUG IN TV AND MEASURE THE HIGH VOLTAGE CAPACITORS. THESE CAPS WILL BE 160 VOLTS OR MORE....TEST THESE. TELL ME WHAT YOU FIND. WITH NO LED STANDBY LIGHT...I WOULD BELIEVE IT IS THE POWER SUPPLY. IF YOU CAN DO IT SAFELY, TRY THIS. SOME FUSES WILL NOT LOOK LIKE A CONVENTIONAL FUSE. ON THE BOARD A FUSE WILL HAVE A LETTER F FOLLOWED BY A NUMBER,CHECK THESE. LVDS CABLES ARE THE RIBBON TAPE CONNECTIONS. THESE MAY BE REMOVED, SPRAY A CHAMOIS STICK AND CLEAN THE RIBBON END. CLEAN THE ACTUAL CONNECTION ON BOARD. yOU MAY HAVE TO LIFT A SMALL CLIP UP TO EXIT RIBBON CONNECTIONS....BE CAREFUL HERE, THEY CAN BREAK. REPLACE AND POWER UP AND SEE IF A STANDBY LIGHT COMES ON. WITH A VOLT METER SET A 200 VOLTS +. PLUG IN TV AND MEASURE THE HIGH VOLTAGE CAPACITORS. THESE CAPS WILL BE 160 VOLTS OR MORE....TEST THESE. TELL ME WHAT YOU FIND.

Thanks appreciate your input.I am getting the high.voltage on the imput high voltage caps of the pwer suply pcboard.on the output of the psuply pins I get a very low voltage 8.5volt or 9volts.The main pcboard dont hve 5volts.How do I isolate the pwersuply totaly away from main pcboard .To chek correct votages on pwer suply pcboard?to ensure pwersuply pcboard is 100 %?What voltages should I get?Hope my question is clearly understood.Apreciate your imnput, thanks again.Kind Regards Thanks appreciate your input.I am getting the high.voltage on the imput high voltage caps of the pwer suply pcboard.on the output of the psuply pins I get a very low voltage 8.5volt or 9volts.The main pcboard dont hve 5volts.How do I isolate the pwersuply totaly away from main pcboard .To chek correct votages on pwer suply pcboard?to ensure pwersuply pcboard is 100 %?What voltages should I get?Hope my question is clearly understood.Apreciate your imnput, thanks again.Kind Regards