dead battery

[Tomas Riveros Schober]

try again and it will eventually work....the usb cable connected to the 
computer is usually the way to go...and when it boots, quickly swap it 
to the ac charger...at least that's what i just did (my neo died during 
the night)


Vince M. Clark escribió:
> Well, I'm out of options. I left my fr plugged into the trickle 
> charger overnight. Still won't boot.
>
> Then I read this last post, about removing the battery long enough for 
> a reset, plugging into USB for 5-10 min, unplug/pause/plug back in. 
> Still won't boot.
>
> The only thing I haven't done that was recommended in this last post 
> is to use the latest u-boot. Unfortunately I cannot do this until I 
> get it to boot. Guess I will wait for my external charger to arrive.
>
> Should I be concerned that this isn't just a battery issue and maybe 
> my fr is dead?
>
> ----- Original Message -----
> From: "William Kenworthy" <billk at iinet.net.au>
> To: "List for Openmoko community discussion" 
> <community at lists.openmoko.org>
> Sent: Wednesday, October 1, 2008 12:01:52 AM (GMT-0700) America/Denver
> Subject: Re: dead battery
>
> These are my understandings from lots of reading and previous posts
> between myself and Andy Green and others on the subject - should all be
> in the archives.  With 2007.2 I was hit one out of every 3 overnight
> suspends ending in a flat battery.  At least with 2008.9 its rarer (but
> does happen :(
>
> With the later u-boots, usb default is 100ma as soon as its plugged in.
> This unfortunately is less than a running Fr needs.  Normally as soon as
> the operating system is up enough, it will negotiate up to 500ma with
> the host, or in the case of the wall charger, read the sense resistor
> and see that 1A is available.  When the OS is suspended, the PMU manages
> the charge until the battery is charged whereupon it switches off - and
> stays off.  If the OS is running, it will cycle back on when the battery
> level falls to 10-20% (reports vary) as the OS can reset and renegotiate
> the charge level.
>
> If the battery is very low (i.e., the internal fail-safe disconnects
> it), remove it from the phone for 30 seconds or so.  This allows the
> fail-safe to reset (this is what I think happens based on my
> observations) so the 100ma can get to the battery, and also reset the
> phone hardware - in particular the GSM modem which is directly connected
> to the battery and is thought to be root cause by Andy Green - possibly
> goes into a wierd state as power drops as well, preventing restart until
> reset.
>
> The power rail of course drops due to the inrush current much more
> during startup with a low battery than normal, causing one chip (USB I
> think) to detect a dangerously low voltage and issue a shutdown.  So you
> cant get the phone to boot until the battery has had a few minutes of
> charge.
>
> In my case, USB to my laptop or a desktop machine does it.
> Remove/pause/replace battery
> plug into USB for 5-10 minutes
> remove/pause/replug USB cable and normal boot will happen within a few
> seconds.
>
> The wall charger should work as well, but on my one try it didnt -
> possibly because the u-boot wasnt new enough at the time.
>
> Recommendation - use a late (latest!) u-boot.
>
> BillK
>
>
>
> On Tue, 2008-09-30 at 22:13 -0700, Michael Shiloh wrote:
> > > Vince,
> > >     When my battery died I plugged my phone into the OpenMoko 
> supplied
> > > charger, started it using NOR boot, leaving it at the boot menu 
> until it
> > > timed out (repeat that twice) then I was about to select boot from 
> the
> > > NOR menu and after a few extra seconds the phone booted.
> > >
> > > -Shawn
> > >
> >
> > I'm confused. I thought that we didn't turn on the charger until we
> > booted into Linux. Am I wrong? Do we charge in u-boot, even at a low 
> rate?
> >
> > Michael
> >
> > _______________________________________________
> > Openmoko community mailing list
> > community at lists.openmoko.org
> > http://lists.openmoko.org/mailman/listinfo/community
> -- 
> William Kenworthy <billk at iinet.net.au>
> Home in Perth!
>
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