Macbook Air 820-00165-A No Sound after SMC replacement

[Praveen Sahwal]

Good Day

Macbook Air 820-00165-A came for repair. It was badly rusted near SMC so I tried to replace the SMC. But After SMC replacement every thing works fine except sound output. i have tried new speaker and I/O board and SMC reset. I have no idea where to start for this problem. I did visual inspection of U8040 and nearby area looks good.

Thanks in advance for your support.

 

[Praveen Sahwal]

I checked voltage at some points, here it is:-

U8040-Pin 6--3.2V
Pin 2,4--1.5V
Pin1,3--1.5V
P1V5SOSW_Audio_EN--3.2V i think it should be 1.5V f i am not wrong.

 

[2informaticos]

"P1V5SOSW_Audio_EN--3.2V i think it should be 1.5V"
Do not confuse enable signal with power line!

Did you have sound before SMC replacement?
Be sure to use SMC from donor board, same model.
I recommned you to reball original SMC.

 

[Praveen Sahwal]

Thanks for support and guidance.
I tried it again with a different SMC from donor similar board. And it start working everything. Thanks again. i think previous SMC was from 820-03437-B. This is my first SMC replacement. Its boom........Great...

Thanks Louis..

 

[2informaticos]

You're welcome!

BTW, my name is Vali.