You have to check (or have someone else check) the surface-mount fuse on the LCD driver board which is attached to the LCD panel at the top under a metal shield. If it's blown, you will get audio and back lights but no video.
If that doesn't fix it, then replace all the electrolytic capacitors in the output section of the power supply.
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i have a daytek lcd tv and the sound is working fine but there is no image showing up
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