820-00239 no backlight after closing and opening lid

[arash]

had some liquid damage. Some corroded caps all over the place. Replaced them all.
Lid sensors have no corrosion.
where could i measure. what could be the next step. i have no idea.

 

[2informaticos]

Check SMC_LID and SMC_LID_LEFT/RIGHT levels.

 

[arash]

Chaged one hall effect sensor (board), since it had wierd diode mode mesurements. Now it works. thanks

 

[Askaleto]

Can you tell us which element on schematics (mark) did you change?

 

[2informaticos]

He said Hall sensor (board), is external.
Left sensor connected to J5250 and right one to J5260.