no picture at all, sound works fine

@bnt you will have to open it and take a look at the boards. It is possible that this is caused by a bad inverter. If it's the inverter you will get some light or picture on the screen when it switches on for a fraction of a second, then the backllight goes off but you will continue to have sound. Post some images of your boards with your original question. Use this guide for that.

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