I had a bad storm lightning hit the tranfotmer outside our tv was on when it happened now there's no picture just a blue screen on input but I have a picture on dtv. But still no sound what do I do

SOURCE: Sony Bravia KDL 40 HD

it's in a service test mode. have you unplugged the tv? that should reset the tv..if you still have problems after ..it will need repair.

SOURCE: Scanning dtv channels

go to menu setup and do the full system reset setup option... Then before you scan for channels make sure it is set to cable... This fixed the problem for me.

SOURCE: 42 inch DO42746 no picture or sound

It is still possible the z sustain board is bad. or an x driver board.

SOURCE: screen froze during lightning storm. no picture

What did you find as your problem? i had the same symptom on the same tv. Screen froze during lightning storm, now looks like display powers up but no picture or menu. I have let mine sit unplugged overnight without any change. Normally i would suspect Power supply board and it might be but I think the Tuner/CPU board is more likely given the frozen image.
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SOURCE: How to reset tv. Have sound but black screen

LCD's use a colorful crystal see through display which only visible when light is shining through it. if you have sound and no picture it's always a faulty PSU. Very easy to change out actually.