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I changed the Audio board and Flex (known good, working in another A1932).
I also had to changed the keyboard (liquid damaged) to a new one.
And i changed the Flex left with Microfon and Hall (used from another MB).
Nothing was changed with this problem.
The microphone does not work either...
I'm working on a 820-01521 (A1932) which had a liquid damage. I have repaired the board so that the machine is running now. I only have problem with the backlight after closing/opening the lid.
After opening it looks like the display is black. After pressing a Key the picture is coming up...