-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: | Andy Green wrote: |> I really couldn't make a story for it, GSM power is controlled by |> another FET switch U1705 that is enabled by a PMU GPIO, there is not |> even a path to VBAT (GSM power rail) during all this. | | That's not the VB->U1705->VBAT->GSM path, but the | VB->VB_GSM->U201.VBATT path. Has a nice 22uF bypass on it (C208).
I remember this now, there's no switch on it because when there was a switch on it, sometimes it blew the current limit. Leading to the logic that enabled the RF power amp having switched power but not the RF power Amp itself :-| Unfortunately it's the same setup in GTA02 A3, if that's a valid clue. Or maybe Graeme's A3 unique point is that it has a good backup battery? Anyway the main battery + pin shows no signs of any dents or load and sits there at about 0.4V itself before during and after the fun on Vsys. ~ I don't think this can be it. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAkhpGzoACgkQOjLpvpq7dMrDBACePb73PWOnFhp/Ht1kiIJiWj53 aKIAnRjPiCtrJYgf2nkk2dzOrIuWaWvV =EwRt -----END PGP SIGNATURE-----
