I have a weird issue here. My sound detector module’s envelope output has suddenly gone dead. It has a keyed plug, so reversing VCC and GND is not an option. Envelope will only jump up when I really tap the microphone hard. I have replaced r3, tried a 1M at R17 without R3, but that does not improve. Is the LM chip dead?
It’s possible that the LMV324 or the mic is damaged. What size resistor do you have at R3? Can you send a clear, high resolution photo of the top of your board?