820-3437 Macbook air Display not going to sleep

[supamodz]

working on a 820-3437 computer works fine hardware test comes up fine but computer will not go to sleep any ideas where to look .

 

[aprendiz]

LID switch is on I/O board, inspect for water damage, also check de cable and connectors.......

 

[supamodz]

i tried another io board and cable same issue

 

[supamodz]

i also forgot to mention there is no audio either that's why i tried replacing the io board.

 

[2informaticos]

Did you try compatible LIO board?
Measure SMC_LID on MLB, when lid is closed.

 

[supamodz]

SMC _LID is 0v when closed when i open lid its 3.4xx volts which seems to be normal but the display stays on and will not go to sleep

 

[supamodz]

Does anyone know what puts the display to sleep, that seems to be the issue here. i see the keyboard goes to sleep but the lcd does not .

 

[2informaticos]

Check EDP_BKLT_EN with lid closed.
Also check if Q7706 is not shorted...