On 12/19/2015 9:27 AM, H. Nikolaus Schaller wrote:
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.
That's good to know. I had foolishly assumed that the GTA04 used the
same solution as the GTA02.
So which OS&kernel are you using? In most systems I know, the RTC
"resets" to 1st Jan 2000.
I'm using Radek's last QtMoko, v56 for GTA04, kernel
3.7.0-gta04-qtmoko-v56. The RTC *does* reset to 1 Jan 2000 0:00 but I'm
at UTC -8:00 so it becomes Dec 31, 1999 16:00. If I could trigger the
tpw65950 manually via console every once in a while that would be fine
enough.
Thanks,
-Andrew
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
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