Re: [iPAQ] Deep Discharge rendered my 3870 dead

From: Nils Faerber <nils.faerber.a.t.kernelconcepts.de>
Date: Thu Jan 22 2004 - 06:46:30 EST

Am Mi, den 21.01.2004 schrieb Jonathan Jackson um 21:55:
> Hello,
Hi!

> I have a 3870, of which I allowed the battery to discharge fully.
> Now, I am unable to wake it up.
>
> I applied power through the AC adapter/dongle adapter according to other
> advice/instructions I found on the list:
>
> -Leave unpowered for quite some time
> -Power for two hours
> -Unplug for an hour
> -Reset (tried both hard and soft)
> -Plug in power for five minutes
> -Reset again (and again, tried both hard and soft reset)

Have you tried to reset it _while_ connected to AC?
If your battery is dead then the Dallas ds2760 will disconnect your
battery from the system in order to protect it from really full
discharge. It will only reconnect it after a charge and the charger is
controlled by the kernel.
You see the problem?
So the only way to wake it up again is to have AC online and then do
reset and keep AC online until the battery has been fully charged again
(after boot of course).

> To no avail. Could my battery be toast? Would cracking the case open and
> disconnecting/reconnecting the battery be of help?

I don't think so.

> I would feel better if I knew what the above process actually does: Are
> we resetting something about the state of the battery? Are we losing the
> ability to charge the battery because it is discharged too fully to
> allow the controller to engage?

s.a.

> I have another 3870, if it would help matters, I could swap the
> batteries between the two. But I would still need to know how to revive
> the first one.
> Any advice is greatly appreciated,

Try the above process of resetting whil on AC.
This should work without any black magic (i.e. waiting, turning the
device upside down, sending prayers to CRL :)

> --Jon Jackson
CU
  nils faerber

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Received on Thu Jan 22 11:46:38 2004

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