Am Do 30. Oktober 2008 schrieb Angus Ainslie: > 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.
Even without the bead attached? > > > > 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 > ) Great rework shown in your other mail. > and have the connector reattached so I can try and dump the GSM firmware. Sorry I don't understand this. Isn't the connector attached yet? Why would you want to dump GSM FW and why would you need the connector for that? cheers jOERG
signature.asc
Description: This is a digitally signed message part.
_______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
