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This is intended to be a power saving feature; if enabled, audio detection will be driving the enable pin with a few seconds of hysteresis: http://www.thinkwiki.org/wiki/How_to_enable_audio_codec_powe...

Now the problem is, why would a MOSFET be destroyed even if there is a few seconds of hysteresis?! Well, defective driver is a still possibility, but perhaps it's a hardware problem.

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