On Thu, Oct 30, 2008 at 7:30 AM, Joerg Reisenweber <[EMAIL PROTECTED]>wrote:
> Attaching the bead is *not* the fix exactly, cutting the connection from > JK4401:4 to coppertrace is considered the fix. I cut the connection between pin 4 and its pad. The bead is now in series between the pad and the spring that used to be JK4401:4. > Anyway it seems you tried to achieve this by cutting the contact from > JK4401 > (your first picture). Alas it's not clear if you correctly isolated > pin4-pad > on PCB, so to me it looks like you soldered the bead on the pin4-pad and > maybe you just shorted the tiny gap between PCB-pad and the metal-stub > where > you cut off pin4-contact on JK4401, while soldering the bead. > No there is no direct connection between pad 4 and the connector. > > Cutting the contact sure is a good thing, anyway I recommend to isolate > pin4 > PCB-pad by some plastic, so it is securely NC and in some distance to > JK4401:4 metal spring. (see: > > http://people.openmoko.org/joerg/GSM_EMI_noise/noise_stopped_by_cut_pin4/JK4401_isolate_pin4__2.jpg) > Then do first test to find buzz is gone. That's effectively what I did. I attached teflon tape to the bottom of the connector to isolate it. The buzz is still present. > Then place bead to pad of R4404 NC, or even piggyback it to C4405, and > connect > to upper golden contact of JK4401, above pin4. (Please note you need the > bead > only for hs mic function, which may still be broken when using it during > GSM > RF activity) > Right now I what to get rid of the buzz ( I'm going to attempt the A7 bodge ) and have the connector reattached so I can try and dump the GSM firmware. Angus -- Angus Ainslie http://www.handheldshell.com/
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