Question Lg 55lh90 problems

[Mrxup]

My Lg lcd led has no power,no audio,no video,only has steady stand by light on.any help?

 

[rgd1101]

power button broke? power supply broke?

 

[Mrxup]

Really I don't know.I need help for troubleshooting.it has 4 boards, tcon board.main board, backlight inverter and the power supply.