I've got this 820-3662 that shows no video on the internal display. i get 0v on L8300 so i checked back at u8300 and have 0v on pin 1 which is the power on pin for u8300. i get 0v on PPVOUT_S0_LCD/BKL/T. I don't think this machine is seeing the lcd but not getting voltage on u8300 is making me think of u1100 not working properly.
i did reset the PRAM and smc
i did reset the PRAM and smc