macbook air no sound

[sisyphe]

hello
could i have some help to understand where is my mistake, anyway still don't know how the sound are generate in appleboard
this board macbook air "Core 2 Duo" 2.13 13" (Mid-09)
it been back to life with reflow but it's for me a nice training that's the point
the wire who connect the FaceTime camera was cut off and L9050 and C9050 been damage did replace them, FaceTime working no sound or mic
i connect the mac on cinema display it has sound and mic then not GPU problem !
PPBUS_G3H i have 7.46V
PP3V3_S0_MIC_F is 3.3V sorry
I think it could be a transistor gate how to check it ? show me the way please
i have another board then i got all SMD needed !
please don't tell me it's a IC
thank you so much

 

[2informaticos]

Post 820-xxxx of your board.
Need to know which schematic to use...
Bad audio connector is common failure for all MacBooks; as broken traces, or small resistors/coils on its area too.

 

[sisyphe]

holla
820-2375-A and i do use the schem MLB M96 PVT 09/26/2008 and 820-2375.brd
audio connector look good
will test all the traces , i'm back to say if this it
gracias por su ayuda

 

[Alan.L]

measure voltage on PPBUS_G3H (PPVIN_S0_AUDIO) on the audio connector.

 

[2informaticos]

I was talking about headphones connector...

 

[sisyphe]

hello
PPBUS_G3H on the audio connector IS 7.49V not good (it should be 12.6V )
no sound at all ! by the macbook it self , but connected to cinema display every thing working true the mini display port

can't found this PPVIN_S0_AUDIO on schematic !

PPBUS_G3H have 7.46V
PP3V3_S0_MIC_F is 3.3V sorry young and confuse

( if i understand well it could be U7900 IC ? CHGR_UGATE 7.51V / CHGR_LGATE 0V / CHGR_PHASE 7.48 )

really appreciate

 

[Alan.L]

board was it liquid damaged? when you goto system preferences > sound > does it show any sound output?

have you try another audio board?

i think display port use MCP for sound and internal speaker use audio board for sound.

 

[sisyphe]

not liquid damaged and no was all greyed ou no sound output or input Yes i did try another audio board and speaker

ok working thank you it was faulty flex between mainboard and speaker

really appreciate your help anyway i learned see you soon !