Macbook A1708 820-00840 Buzzing Sound

[Instafixx]

Hi My right speaker buzzes whenever i open youtube or start playing any sound.
I tried with another speaker - but same.

The board has no corrossion as such.
J6603 - Diode Mode Reading
Pin 3/4/5/6/7/8 = .584
Pin 9/10/11 = .584
Pin 12/13/14 = .588

 

[Instafixx]

There was corossion under U6440. Removed - Cleaned - ReInstalled. Its less buzzing but its still there. Should we change it ?

 

[2informaticos]

You should do that.
May also have another surrounding caps affected by corrosion.

 

[Instafixx]

Before Replacing the U6440 . Readings of surrounding caps.

C6447 is .947
C6440/1 is .364
C6442 is .567
C6448 is .596
C6443/4 is .412

Seems okay? Should we replace ?

 

[2informaticos]

If can't clearly see corroded caps, change U6440.
Once the chip is removed, check trace continuity from its pads to surrounding components.

 

[Instafixx]

Replaced U6440. Solved