We found it's pin4 of JK4401 and only this pin that causes GSM-EMI-noise issue. We placed a ferrite bead to this pin, and it stops noise. Alas this isn't a viable rework, as it is extremely fragile and doesn't fit into case. See <http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_athena_rework/>
We tried to find another way to place a bead in this rail, first result (without bead yet), see <http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_cut_pin4/> This rework at least stops noise and should fit into case. It breaks function of headset mic and hold-button, but keeps function of headphones. We try to find a way to restore function of mic and button, based on this rework. I will keep you updated. Please note all this IS NO RECOMMENDATION FOR A REWORK, and we can't answer any questions yet beyond what I've reported above. cheers jOERG
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