Hi, Am 12.12.2015 um 03:06 schrieb Benjamin Deering <ben_deer...@jeepingben.net>:
> On Fri, 11 Dec 2015 15:38:54 -0800 > Andrew Schenck <and...@springahead.com> wrote: > >> That's a lot more work than I had hoped. Thanks very much for the >> info though. If I'm going to be soldering I might as well try to fix >> the USB port and GPS port at the same time. >> >> -Andrew >> >> On 12/11/2015 1:30 PM, Benjamin Deering wrote: >>> The backup battery (supercap?) is welded to its bracket and >>> won't push out. >>> >>> I replaced the backup batteries in my GTA02s with supercaps several >>> years ago. >>> http://www.jeepingben.net/zen/zenphoto/index.php?album=2010/freerunner_supercap_install >>> >>> The parts I used didn't match the original footprint so it was a >>> little work. If you get the exact replacement part, it would be >>> easy if you have soldering experience. >>> >>> I vaguely remember a software problem causing the line that charges >>> the backup bat/cap not being set high. >>> >>> Good luck, >>> >>> Ben >>> >>> On Fri, 11 Dec 2015 12:26:54 -0800 >>> Andrew Schenck <and...@springahead.com> wrote: >>> >>>> The secondhand GTA04 I have now is pretty beat up and can't charge >>>> because the USB port is disconnected. I've been using a spare >>>> GTA02 as a charger, but every time I switch out batteries the >>>> clock resets to 12/12/1999 16:00 and it's a pain to re-set it >>>> since network time doesn't work. I couldn't find any information >>>> on the wiki about replacing the CMOS battery to solve this >>>> problem; has anyone here dealt with this same problem before and >>>> have recommendations? The GTA04 already has a supercap in battery shape. They came to the market in ~2011. Since there is nothing to replace (a supercap rarely fails), it is most likely a software issue that the charging current provided by the tpw65950 is not enabled. So which OS&kernel are you using? In most systems I know, the RTC "resets" to 1st Jan 2000. > I was successful in fixing the USB port, but never tried the GPS port. > The GPS port is under a lot of stress when the board is installed. Should not be the case. You should move the USB+GPS socket as flat as possible into or out from the case. Then push out the case at the position of the headset connector so that the latter snaps down a little in its hole. This avoids breaking off connectors. See also photos in chapter 4 (especially page 18) of the GTA04 system manual: http://projects.goldelico.com/p/gta04-main/downloads/47/ > > I ended up giving up on the traces and soldering thin wires to the ESD > protection chip and to the leads on the jack. That is fine and indeed sometimes needed if a socket was broken off. > > After getting the USB port connected electrically, I used JB weld epoxy > to fix it mechanically. The repair lasted years including some pretty > rough use and being reflow soldered. > > Good luck, > > Ben > >>>> >>>> I disassembled a GTA02 enough to see the battery, but it didn't >>>> yield to gentle pressure trying to slide out of its bracket and I >>>> don't want to destroy things too badly in my attempt to fix them >>>> so I didn't push too hard. Because of this, I don't even know the >>>> exact type of button cell to buy to replace it. Any help would be >>>> appreciated. The GTA04 original part is a PAS414HR-VG1. BTW: it should also work in the GTA02 (which has a real 3.3V LiIon cell in 414 package). >>>> >>>> Thanks, >>>> -Andrew BR and also good luck, Nikolaus _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community