Original post by: Minho ,
Just so I know, did you decontaminate the logic board first, otherwise you could be faced with latent issues down the road? Now, you have changed just about everything. Did you also test the cathode filters? the only thing I can see is that you didn't use a new backlight IC; perhaps that is the problem. Were the other parts you replaced new or used? Take a step back and probe the diode in situ. Check the caps and the rails for shorts. Check the voltage levels at the coil and filters. There's not much to this circuit, it is essentially on a [https://en.wikipedia.org/wiki/Boost_converter|boost converter].