plasma tv screen black and sound from circuit board

[just a 2strokebloke]

I have a 42 inch LG plasma which went of while watching. there was no piping sound and all the capaciters look fine and no visual defects on the circuit boards any ideas or test I could do?

thanks in advance kinda new to forums

[just a 2strokebloke]

I forgot to mention there is a funny sound coming from the power circuit board. I can only describe like a internet dial up sound but louder

[just a 2strokebloke]

fixed circuit board noise but still no picture only audio

[Meat-Head]

hi welcome to dk

sounds like your foo-foo osclater ~~~~ed the psu

[R_J]

Check the fuses on the ysus and zsus boards if one of them is open then the large ic located under the large heatsink is bad.
these are the boards locaded on the left and right side of the panel.