Hi. I'm Steve. I'm sorry to hear about your TV. I will try my best to give you a precise and accurate answer.
We're going to need a little bit more than that :)
6 questions for you:
Is the TV new to you?
If not, was it working fine previosuly?
Do you use a surround sound system for audio?
If so, I need details on that.
Are you using a cable box?
If so, how is it connected to the TV.
Ok. Thanks for that.
Is the TV completely dead or do you get a power LED lighting up when you plug it in?
the tv is not completetly dead I get sound power light comes on I can ghange channels as normal but do not get picture
Ok, I understand. When you reply, give me the full model number please.
It could be three things.
1. Main Board
2. Power inverter board(s)
3. Backlighting (LCD Panel).
Let me know the model number and we'll try and narrow it down. Would you be able to remove the back from the set and check a few things? Do you have a meter?
Let me know.
Ok, shoot me over the model number so that I have the right manual.
I have to respond to remove the lock from this question.
Report back when only when you are ready :)