No picture on a LG32LS3450 but sound is OK

I have a problem with a LG 32LS3450 TV which I'm trying to repair for a friend sound is ok I can see the picture content when shining a bright light on the front of the screen which lead me to believe that the back light circuit is not working or the circuit that feeds it. I’ve checked that the 75 volt is ok to the white LED plug by checking between earth and one of it’s pins, but checking directly the pins of the white plug no 75 volts are present whether the plug in or not, does this mean the MOSfet Q803 has failed or is it IC801 that’s failed, please advise.

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