<div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div class="Wj3C7c">On Tuesday 26 August 2008 14:22:54 Joerg Reisenweber wrote:<br>
> We found it's pin4 of JK4401 and only this pin that causes GSM-EMI-noise<br>
> issue.<br>
> We placed a ferrite bead to this pin, and it stops noise. Alas this isn't a<br>
> viable rework, as it is extremely fragile and doesn't fit into case.<br>
> See<br>
> <<a href="http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_athena_rew" target="_blank">http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_athena_rew</a><br>
>ork/><br>
><br>
> We tried to find another way to place a bead in this rail, first result<br>
> (without bead yet), see<br>
> <<a href="http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_cut_pin4/" target="_blank">http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_cut_pin4/</a>><br>
> This rework at least stops noise and should fit into case. It breaks<br>
> function of headset mic and hold-button, but keeps function of headphones.<br>
> We try to find a way to restore function of mic and button, based on this<br>
> rework.<br>
><br>
> I will keep you updated.<br>
> Please note all this IS NO RECOMMENDATION FOR A REWORK, and we can't answer<br>
> any questions yet beyond what I've reported above.<br>
><br>
> cheers<br>
> jOERG<br>
<br></div></div></blockquote><div><br>Hi,<br><br>Even thought this is not not a recommended rework I started on it. I (wrongly) assumed by just removing the connector that it would fix the noise issue. It doesn't.<br>
<br>I'm assuming that is because pin 3 and 5 need to be shorted. I've been trying to find the pinout for JK4401 but no luck yet. Is it<br><br> 1-3-5 5-3-1 <br>plugin end -> or <br>
2-4-6 6-4-2<br><br><br>Does anyone have a pin-out ?<br><br><br>Angus<br></div></div></div>