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Old 09-04-2012, 10:17 AM   #15
knc1
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Posts: 5,780
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Join Date: Feb 2012
Device: Too many.
Quote:
Originally Posted by felonwan View Post
Because the led light always went out in the charging process, I do not trust the charging in the Kindle. The charging using my charger takes about one day and night to "full" charge the battery. But I'm not sure whether the battery is really fully charged.
My K3 is nine months old and has lead a very sheltered life.
I just put it into "DIAGS" mode and pulled up the factory battery management report screen:

Edit: The original numbers here where taken while the K3 was connected to a bad wall charger.

Charge level: 100%
Terminal voltage: 4.185 volts
Current draw: 73.899 ma. (positive == charge, negative == discharge)
Charger draw limit: On
Charger mode: On
Battery temperature: 80 degrees F
Charge cycle count: 15
Charge learn count: 14
Battery LMD: 1823 mAh
Battery Flags: 0xA4

The above copied at the point where the led went from orange to green.
The charge curve had started out at an 800 ma. rate on the (good) wall charger and has been tapering off starting at about 93% of full charge.
EDIT: The above observation indicated that the charge current limiter had failed. Which lead to the death of the wall charger. When a new wall charger was used, it lived long enough for the USB charge circuitry to self destruct.
The main problem here (other than the hardware failures) is that the control firmware for the charge limit checks for: Off, 100ma, 500ma, Other.
And the author assumed that "Other" would be somewhere in range, not over-range. (The wall charger can supply 850ma but the K3 circuitry is only good for 500ma).

The good: It failed while I was watching it - so I know how and why.
The bad: I now need to return my K3 with its dead wall charger and smoked USB port circuitry.
I guess that is progress.

One of the "to do" items for K3Flasher is to pull this information out of the Kindle using the iROM code.

That way K3Flasher can advise the user if the machine needs to be re-charged before preceding with the flash operation.

But while waiting for all of that to happen, see if you can get your battery re-charged to the 4.0 .. 4.2 volt level.

Heck, it might even "just work" after that (others have).

Note: added the file name: ENABLE_DIAGS on user storage, zero length file is ok.
home -> menu -> settings -> menu -> restart
wait
either t or g on the diagnostics menu

Last edited by knc1; 09-06-2012 at 06:20 AM.
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