Macbook Air a1932 only right speaker working

[obelix24]

I just got one macbook air a1932 that is fullu working (no signs of liquid damage but there is strange issue that only right speaker is working (that one that is connected directly to audio board)
the other one is not working at all.

i've tried to replace left speaker 3x and still no sound, i've also replaced audio board but still the same.

Do you know what can cause this issue ?

[mon2]

Left speaker(s) work in the right speaker audio out?

[obelix24]

In the setting when i turn the switch to the left and then i try some left right test on youtube then there is still no sound from left speaker but the right speaker is acting as the left (hard to explain i hope you understand

[mon2]

Yes, I understand. It appears the logic board is not detecting the left speaker logic. Just asking if the actual left speaker makes sounds if you attach to the right speaker connector. Assuming that the actual speaker is not defective.

Review U6400 which is the audio codec that is responsible to convert the digital audio signals to analog ones for the left speaker (only). Share a good pic of this part. This part may be defective.

Study the parts linked to the LEFT speaker to be sure each is present. Suspecting that the audio codec is the root cause if BOTH the right & left speaker audio are being merged into only the RIGHT audio channel. That is, if this U6400 was ok, but issue was with the output side parts for the left side, then the left audio would not be merged into the single channel. The PCH who spits out the audio would continue to stream out the audio to U6400.

Review this area of interest.

[obelix24]

Ok i've replaced U6400 and both speakers are working now thank you