ADMP421 - how to check...

Hello All,

I have a board where ADMP421 is used. We did a rework (using hot air) and noticed the following behaviour:

+3V3 - is present and correct
GND as well.
L/R - is low
CLK input is 2.048MHz
DataOut is present. (Seems to be valid)


Problem is : there is no any sound coming from the microphone.
Other board is working correctly
Question - How to check if microphone (the membrane) is not destroyed ?

Thanks in advance.

BR
Mariusz