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

Data out is present. (See captured image below)

Problem is  : there is no any sound coming from do microphone.\

Other board is working correctly

Question  - How to check if microphone (the membrane) is not destroyed ?

Thanks in advance.