mac air 820-00165 board no back light

[turbo]

customer tried to change lcd now back light blown,

fuse good,
PPVIN_S0SW_LCDBKLT_FET=0v

i see EDP_BKLT_EN=0
BKLT_PLT_RST_L=3.3v

why EDP_BKLT_EN=0v?



led drive bad? if led led driver bad there should be still 8.6v to L7701?


what to do what to do

 

[2informaticos]

Do you get image without backlight?
Any voltage at DP_INT_HPD?