820-00164-A no backlight after waking up from sleep.

[Yoel Ren]

smc_lid is 3.4v stable.
after sleeping for a while, board would not have backlight when i open the lid.
part problem has been ruled out as I put the board on my known good housing.

smc has been reballed.
u9701 is replaced, with a5 jumper to pin 2 of d9701
lvds has been replaced too.
any pointer ?

 

[2informaticos]

You didn't specify if image is present.
What is the backlight output voltage at LCD connector in that moment?