Black screen - sound OK
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
Check the voltage that comes to the back-light inverter board; from the main power board. The absence of this voltage too can be the cause.
Posted on Oct 16, 2014
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