<rapha>
but they're not diodes or anything else sensitive to polarisation, they're resistors? *sratches head*
<Joerg-Neo900>
do the math
<rapha>
depends on how they're built then i guess, but probably one of these tiny SMD thingy casings
<Joerg-Neo900>
when you feed +4V@5A peak to GND and battery GND to upper end of those resistors
<rapha>
okay, 5A is massive
<Joerg-Neo900>
(I'm obviously assuming the metal battery bay is connected to GND, not BGND)
* rapha
gets some more isolating tape
<Joerg-Neo900>
another thing to learn here: battery minus is not really good GND level for anything
<Joerg-Neo900>
e.g. when you want to fuzz with charging or testing, via the testpoints in battery bay
<rapha>
you mean even battery minus could have a large enough potential towards true ground in terms of damage it could do?
<Joerg-Neo900>
not re damage, but re proper working of whatever you plan to do via those testpoints
<Joerg-Neo900>
particularly battery charging via VBUS testpoint would completely disable the BQ27200 battery gauge when you use battery minus instead proper device GND
<rapha>
the test points are the things under these two sort of slits in the bat compartment steel?
<Joerg-Neo900>
(bq27200 is what those logs I linked to came from)
<Joerg-Neo900>
yes
<Joerg-Neo900>
three actually, the tiny one with 2 dots is USB D+ D-
<rapha>
amazing ... up until now i always took stuff like this to be something people forgot, or some sort of art or something o_O
<Joerg-Neo900>
the iirc upper left one in the long slots is USB VBUS
<rapha>
are you keeping all of this stuff intact on the NeoN board?
<Joerg-Neo900>
TL;DR: yes you can and should reinforce it
<Joerg-Neo900>
ideally _before_ it breaks
<rapha>
next project...
<rapha>
just checked the LiPo ... only has a 12kOhm BSI
<Joerg-Neo900>
I never broke an USB and I didn't reinforce the jacks of my N900s
<Joerg-Neo900>
you *need* 80kR
<Joerg-Neo900>
around
<Joerg-Neo900>
or was it 90?
<rapha>
i defy your notions: currently i only have 45!
<Joerg-Neo900>
doesn't matter too much, but correct range is important
<Joerg-Neo900>
45k is closer to TEST battery than to normal one, it makes the system enter a very special state
<Joerg-Neo900>
which might explain your strange boot behavior
<rapha>
(would have been cool to have the LiPo piggybacked to the N900 with duct tape or something ... "wait, let me get out my home-improved phone which lasts a week or so on one charge")
<Joerg-Neo900>
somebody did this with three 16450 or what the name of those monster cyclindric cells
<rapha>
:)
<Joerg-Neo900>
looked like a bomb
<rapha>
hell my desk looks like i was building bombs
<rapha>
add that to the fact that i'm doing an MA in Arabistics and Islamic studies and you have a winner :P
<Joerg-Neo900>
hahaha
<Joerg-Neo900>
hope you're not calling Trimp "Mr President" ;-)
<rapha>
but hey if the NSA doesnt have a detailled profile of me i've been doing something wrong
<rapha>
lol
<rapha>
nope
<rapha>
new behaviour: at end of flashing (this time typed "YES") the little funny dot froze before i could pull USB
<Joerg-Neo900>
not like CIA wouldn't catch and kidnap people in Europe too
<rapha>
i'm sure they've done that
<Joerg-Neo900>
it's known they did
<rapha>
the next couple of months are probably not going to be very funny
<Joerg-Neo900>
e.g in italy
<rapha>
:(
<rapha>
"please remove battery, unplug USB, then reinsert battery and let device boot and init system which may take a while" <== what lazyflash says at the end
<Joerg-Neo900>
I prolly have to rethink that instruction
<rapha>
:]
<Joerg-Neo900>
freezing dot that still shows anyway means it's still busy
<rapha>
okay cool then i'll just let it sit like that during the night
<rapha>
really tired
<Joerg-Neo900>
it shouldn't take longer than 5 min, and I stringly recommend to shut the device down during night, until you're sure it starts charging the battery
<rapha>
hmm okay
* rapha
goes to find something to eat
<rapha>
it's the last try for today in any case, the battery is getting weak
<Joerg-Neo900>
how long since the dots shown?
<rapha>
this try, only about 60 seconds now
<Joerg-Neo900>
aah ok
<rapha>
is it not trying to keep the battery charged through the USB port?
<Joerg-Neo900>
what does it show?=
<rapha>
frozen dot on position 2 of 5
<Joerg-Neo900>
usually yes, but only with intact system
<Joerg-Neo900>
frozen dot is a good sign
<rapha>
k
<Joerg-Neo900>
you did answer "YES" ?
<rapha>
well yeah then you really need to change that message to reflect that the system needs to be left to its own devices
<rapha>
yes i did
<Joerg-Neo900>
and it said "flashing both" or sth?
<rapha>
yeah
<Joerg-Neo900>
ok
<rapha>
the whole shebang now
<rapha>
battery's recovered a little to 3.64 again
<Joerg-Neo900>
the LED does nothing?
<rapha>
nope, not been doing anything the whole time
<Joerg-Neo900>
when a stock system charges, the LED should flash amber when the screen is locked
<Joerg-Neo900>
it's 7 minutes now, please push the power button shortly
<Joerg-Neo900>
if a menu shows up, good.
<rapha>
doesn't do anything. and the backlight is turned on btw.
<Joerg-Neo900>
then please unplug USB, then press power button for 10s and see if it shuts down, then 'remove battery', insert it again and plug in USB. Device shall boot and and start charging after 60s
<Joerg-Neo900>
(it boots even when not 'powered up', into a ACT_DEAD state where it only flashes the LED)
<rapha>
okay 10s press of the powerbutton does nothing
<Joerg-Neo900>
then remove battery, go ahead as above
<rapha>
did
<rapha>
it seems to be in a reboot loop now
<rapha>
amber "breathing"
<Joerg-Neo900>
if the device doesn't show flashing LED and black screen after 60s fromplugging in USB, just remove USB and battery again
<Joerg-Neo900>
breathing amber is excellent
<Joerg-Neo900>
this most likely indicates it's charging
<rapha>
breathing amber alternates with nokia screen and moving dot
<Joerg-Neo900>
let it do its thing
<rapha>
okay
<Joerg-Neo900>
it takes a while
<rapha>
(over and over again?)
<Joerg-Neo900>
no, that's a reboot loop then
<rapha>
pretty sure it is, 5th or 6th cycle now
<rapha>
perhaps it /is/ the low BSI
<Joerg-Neo900>
yes
<Joerg-Neo900>
yes
<Joerg-Neo900>
the check for BSI only starts late in boot
<rapha>
aha
<Joerg-Neo900>
and yes, incorrect BSI may cause reboot
<rapha>
well then i'll just have to wait for the new battery or find a 35kOhm resistor somewhere
<rapha>
(45+35=80)
<Joerg-Neo900>
never thought of that before, but it's plausible
<Joerg-Neo900>
or get the one from BL-5J
<rapha>
i tested all components on the little PCB. none of them was a resistor even close to 80kOhm
<Joerg-Neo900>
afaik it's a thin wirelike thing on the center of one of the flat sides
<rapha>
oh okay
<Joerg-Neo900>
I don't even know if I ever disassembled a BL-5J
<Joerg-Neo900>
was looking for the picktuires of what I thought I did
<Joerg-Neo900>
anyway
<Joerg-Neo900>
~bootloop
<infobot>
extra, extra, read all about it, bootloop is when your device has broken rootfilesystem, so during reboot it fails on some service startup or kernel module load and thus reboots. This *drains* battery! And you can't reflash to stop bootloop when battery is drained. Recharge your battery by other means before reflashing. E.g. using ~rescueOS. Or external charger or BL-5J compatible other device.
<Joerg-Neo900>
so don't let this go on
<Joerg-Neo900>
n8!
<rapha>
nah already detached it
<rapha>
yes, good idea!
<rapha>
thanks again, it was a very relaxed evening playing around with this
<Joerg-Neo900>
:-)
lobito has joined #neo900
<rapha>
HAAAAAHAHAHAHAH!!!! It works!!!!
<rapha>
Brushing my teeth helped!
<rapha>
After that I measured the little battery protection PCB again and found a 97kOhm resistor
<rapha>
it was a little difficult to get cables soldered onto that
<rapha>
and i cut the rest of the PCB away
<Joerg-Neo900>
hey! :-D
<rapha>
now, on the 2.5Ah Kazam LiPo, it works out to 110kOhm
<rapha>
and the N900 just booted straight up!
<Joerg-Neo900>
\o/
<Joerg-Neo900>
yes, with BSI resistor at TEST (which is iirc sth around 15k) it enters some certification test mode
<rapha>
ah okay
<rapha>
so 45kOhm is still below the range
<Joerg-Neo900>
yes, it's too way off the allowed range for normal BSI
<rapha>
but 110 is probably still okay
<Joerg-Neo900>
yes, higher is basically not an immediate problem