HI I have a few questions. Anybody know the full time to charge the tablet to 100% capacity? Also I know the amber light means charging, and it turns off when complete. However has anyone else noticed that when it turns off if you press the power button briefly one time it stays lit white. Unplug the charger the light goes off but plug it in and light stays white. Is that normal? Is this a trickle charge mode or something?
Thanks
btw tablet is powered off when charging and not in sleep mode
When mine is done charging, the lite goes white and stays white till I unplug the charger. This is with the a500 turned off and charging though.
See my tablets light is orange when charging and goes out when done, battery is at 100%. I press it once while still pluged in it turns on to white. is the IC charging chip that regulates charging on my tablet out?
Today my phone chrashed twice when starting navigation while on the car charger. Screen went black, battery charging icon appeared, red led showed. A second attempt gave the same result. I also noticed the LED shining red... was rather afraid. And decided to restart without the charger, start navigation, and no crash.
After unplugging the charger, the screen stayed on the battery icon for a while. I could reboot the phone with the power button.
It woked okay a few times before but maybe the battery charge state was different, or I started navigation before plugging the charger in.
So, I won't use that charger (Samsung CAD300UBE rated at 5V 700mA) again. But why would it crash? The phone running on just charger power (which is insufficient) and crashing - perhaps to prevent damaging the battery with shallow charge cycles? I estimate the charge left when this happened at 80%.
So be careful which charger you use. Does anyone have a similar experience?
Im having same issue, but my phone wont boot up.
Any fix?
Got a new nook simple touch- charged in for 24 hours - will not power up- has the same screen all the time "fully charge before first use".
Tried 4 different charges, cables and different PC's. Contacted Barnes & Noble support - talked me through all various software resets pressing buttons - nothing worked - then told me take it back to store. I cannot return the thing as live outside uk.
I have tried removing the battery by taking the thing apart , leaving battery disconnected for a few hours - reconnecting it but nothing works.
The LED light is always green when plugged into charger, from what i gather it should be orange when charging?
The battery also does not seem to be heating up when charging, i have touched it a few times to test its stone cold
Nothing happens when connected to PC either.
Does anyone know any reset procedure that i can try please as i am getting to the stage of throwing this thing into the bin?
it may just be a bad unit
If you have a voltmeter, see if you can measure a voltage across the red and black leads out of the battery.
The Nook will not boot up without a battery (on the USB obviously).
I haven't looked into whether it's a safety on the thermistor or what.
Renate NST said:
If you have a voltmeter, see if you can measure a voltage across the red and black leads out of the battery.
The Nook will not boot up without a battery (on the USB obviously).
I haven't looked into whether it's a safety on the thermistor or what.
Click to expand...
Click to collapse
Thanks i do have a voltmeter but there is no red black lead, there are 6 wires as in the image attached, do you know what the six wires are or is there anyway to find a pinout from them so i could meter it?
There's no other tricks to reset the battery is there i have heard sometimes the battery needs to be left unconnected for a few hours then reconnected but that didn't do nothing for me
Thanks
I see red, I see black.
The two red wires on the connector are positive.
The two black leads on the connector are negative.
The yellow and the green are for the thermistor to measure battery temperature.
A truly frozen Nook.
I finally got around to investigating fully the whole battery wiring on the Nook.
Some people have expressed interest in running a Nook without a battery.
Removing the battery and using USB power does not work.
As stated above, of the 6 wires, the two red are positive and the two black are negative.
The green wire is a battery ID.
This is a 30K ohm resistance to ground to indicate that the battery is plugged in.
The yellow wire is for battery temperature.
This is a NTC (Negative Temperature Coefficient) thermistor.
It has a resistance of about 10K ohms at room temperature, decreasing as the temperature goes up.
You can run your Nook without the yellow wire (thermistor).
(The battery temperature will be off.)
You do need the green wire (battery ID) to get the Nook to power.
If you want to run your Nook without a battery,
connect a 30K from green to ground (27K seems to work fine) and
connect a 10K from yellow to ground (just to be nice) and
feed the V+ battery with around 4V.
You might try feeding that with a diode voltage drop off the USB connector.
(I didn't try that.)
The screen shot indicates -40C for open and +40C for 5K ohms.
(Thanks to 160thehaven for the photo. I have no macro lens.)
Renate NST said:
If you have a voltmeter, see if you can measure a voltage across the red and black leads out of the battery.
The Nook will not boot up without a battery (on the USB obviously).
I haven't looked into whether it's a safety on the thermistor or what.
Click to expand...
Click to collapse
okay close to throwing this thing away, the light is always green. I think the battery is not charging. even though when plugged in i seem to be getting a voltage swing on the red and black wires.
Should i measure the voltage across the red and black wires when booting up the nook? with the usb disconnected
To make life easy, grab the ground off the metal cage for the SD card.
What's the voltage on the red with no USB connection?
When you connect the Nook to your PC does it ever say, "Found new device OMAP3630"?
The question, is the processor powering up at all?
Is it doing the primary bootloader?
Is it doing the secondary bootloader?
If you had a kernel console, it might tell you what's up.
Just for yucks, what's the voltage on the yellow and green test points?
Does it pulse every few seconds?
his eedolsi
Renate NST said:
To make life easy, grab the ground off the metal cage for the SD card.
What's the voltage on the red with no USB connection? i will test this now
When you connect the Nook to your PC does it ever say, "Found new device OMAP3630"?
yes it does and it looks for the driver and keeps connecting and reconnecting
The question, is the processor powering up at all? how would i know this
Is it doing the primary bootloader? how would i know this
Is it doing the secondary bootloader? how would i know this
If you had a kernel console, it might tell you what's up.
Just for yucks, what's the voltage on the yellow and green test points?
Does it pulse every few seconds?
Click to expand...
Click to collapse
yes when plugged in the light is solid green but then pulses orange every few seconds
160thehaven said:
yes when plugged in the light is solid green but then pulses orange every few seconds
Click to expand...
Click to collapse
Oh, I was asking if the green and yellow test points pulse.
What's the voltage on them?
Mdevai 155
Renate NST said:
Oh, I was asking if the green and yellow test points pulse.
What's the voltage on them?
Click to expand...
Click to collapse
i give up no voltage anywhere, i think the battery is defective
thanks for you help its going to go in scrap heap- only useful debug feature it does is flash the orange light the odd time when connected to charger- prob means something to barnes and noble
im sorry i purchased this
Aw, don't give up so easily.
I hate an unsolved mystery.
You're sure that your voltmeter is working correctly?
You can't measure anything from the V+ test point to the SD card metal frame?
There's no way to exchange it with B&N?
If you are really giving up, I'll take a look/keep it/fix it/return it/something.
Send me a PM for details.
I'm actually having the same problem. It started a couple of days ago. I tried using this method (http://forum.xda-developers.com/showthread.php?t=1813384) and I was able to at least boot it. However, after only one day (without using it much) it started failing again and now when I use that trick it lasts a few minutes.
I will try measuring the battery voltage and I wonder if it would be a good idea to try to re-root it. However, I don't know if I should try in case it freezes half way through the flashing and I end up with a nice black brick.
I think this issue is happening quite a lot. I hope we can all work together to find a solution.
--Update--
I checked the voltage on the battery and it shows 40mV. So it's definitely depleted. However, when I do the trick and manage to boot the device, it says that the battery is 100% charged and the green LED is on. Conclusion, the device is preventing the battery from getting charged :/ Any ideas how to fix this? Is there any other way I can charge the battery?
40 mV?
If your voltmeter is working and on the correct place, then your battery is way dead, as in broken.
We can argue about whether you should discharge Li ion to 3.5 V, 3.3 V, 3.0 or even 2.5V,
but if any time it's reading a lot less than that, then you have a deceased battery.
If it's open or high resistance, a charging circuit can take it up to 4.1 V easily.
It would show as 100% charged but have no actual charge to backup that statistic.
It's interesting, because the BQ24072 should be able to power up the Nook without a battery.
I think it's that pesky MSP430F2272 that is not allowing the Nook to go on without a battery.
This calls for more experimenting!
Renate NST said:
40 mV?
If your voltmeter is working and on the correct place, then your battery is way dead, as in broken.
We can argue about whether you should discharge Li ion to 3.5 V, 3.3 V, 3.0 or even 2.5V,
but if any time it's reading a lot less than that, then you have a deceased battery.
If it's open or high resistance, a charging circuit can take it up to 4.1 V easily.
It would show as 100% charged but have no actual charge to backup that statistic.
Click to expand...
Click to collapse
First of all thank you for your help.
Maybe I measured it wrong?... I was checking the voltage between the red cable (or so I think) and the metallic frame where you put the micro SD card. I also checked it from there to the black cable and it said 0 V, as I was expecting.
Renate NST said:
It's interesting, because the BQ24072 should be able to power up the Nook without a battery.
I think it's that pesky MSP430F2272 that is not allowing the Nook to go on without a battery.
This calls for more experimenting!
Click to expand...
Click to collapse
Definitely! I'm up for it!
Look, Ma, no battery!
The Nook seems pretty idiosyncratic how it will turn on.
I was trying to make it work just USB powered.
At the least, that gives the people with battery problems a reference point.
On the photo above there are two points labelled "V+ Battery.
Solder the cathode (the stripey end) of a 1N4001 (or better) diode to one of these points.
Connect the anode of the diode to the red wire of a spare, gutted USB cable.
Connect the black wire of the USB cable to the gold border on the circuit board.
Plug in the USB cable. The Nook should boot.
I've tried just stealing the 5V off the Nook's USB connector, but the Nook refuses to boot when both the USB and battery come up at the same time.
The ID and the thermistor circuits don't seem to be that necessary.
i have same DOA device (Simple Touch with Glowlight) , wont power on , green led on usb charger or pc usb cable , quickly reappeared 3630 omap device in device manager when pressed power button
i disassembled device - accu show 2.4v , i recharged accu in turnigy charger - it normally charged about 3 hours and show capacity 1550mah but when i connected it back to the nook it wont power up again and same green light on charger and usb cable , i try all reset combinations - no luck
It is possible for your battery to accept current, charge and still not be able to supply any current.
This would be the case if the charge circuit is working but the discharge circuit is open.
Did you measure the battery voltage after charging?
Can you measure it with some sort of load on it?
50 to 100 ohms would be fine.
If anybody has gotten far enough to tear a battery down any identifying photos of the battery protection module would be appreciated.
i find another working nook (without glow) , tomorrow i check battery (but battery is ok - i try it in charger . internal resistance is low an discharge on 1A corrent is ok )
but now i solder wires from regulated power supply to battery tp - i find nook consumption is 160 mA current on 4.2 v supply and it reacted on power button - if i press pw about 20 - 30 sec is 0 ma current press again and 160 mA still here
battery is ok . screen is ok , mainboard is not ok
working nook eat 150 mA current on start , working nook not start when regulated power supply connected on battery tp - press power button , 150 mA . depress button - 0mA
replaced mainboard ( from nook gl with broken screen) - all working ok
Hi guys,
So after 2 years of owning my nexus 4 the charging port had become extremely loose.
I ordered a replacement which I believe to be a genuine part.
While removing the battery to take the charging port out I made a "rookie error" and accidentally tore the ribbon connector on the battery.
So I ordered a genuine LG replacement battery through amazon. I put everything back together after installing the new battery and port.
I left the phone to charge for a few hours and went to turn it on and nothing happened.
I have noticed a few things:
When i use the old usb port with the new battery, the instant the charger is plugged in a red light flashes once.
When i use the new usb port with the new battery, the instant the charger is plugged in a green light flashes once.
If i hold down the power and volume down button then plug the charger in it takes me to the "android robot" menu but before i can select any options it automatically selects start and goes to the "Google" screen.
Once at the "Google" screen the google logo shows for a maximum of 3seconds and the phone shuts down the led light blinks once.
I realise I could just replace the phone but i have a lot of important data, files and photos that i need to recover urgently.
Any help would be much appreciated.
Thanks
tss240zg
Hi,
Please be aware that all 'genuine' usb charging ports in ebay, aliexpress have notification light soldered in wrong way so green light is red and red is green (not sure if that applies in opposite but definitely the colors are wrong).
There's workaround for this issue: using custom rom with notification light set-up (Chroma, Pure Nexus, etc).
Then you can go to this topic: http://forum.xda-developers.com/nexus-4/general/major-discovery-regarding-battery-red-t2128392
Usually, you could change the port without messing up with the battery at all
I have a P Smart which works powered by the mains USB adapter, but the battery charge never goes up in %
It was stuck on 0% but working as long as the power cable was in, pull the power cord and phone dies.
Phone would spontaneously power on as soon as the usb power was connected.
The red LED glowed on and off continuously, it should stay solid red when charging if battery under 10%
The phone may have got wet or taken a knock as it was in a backpack during mountain biking.
I put it into Huawei recovery EMUI white screen and the battery logo in the top right "appeared" to be charging...but it only got to 1% after 3 hours.
In this case the unlikely answer was to disconnect and reconnect the battery, to do this follow below:
Take the sim card & microSD tray out of the phone.
Then take the back off the phone, going around the edge with a spudger, plenty of details on web of how to remove the back.
You then have to remove a little metal strap bar by unscrewing two tiny screws. (see "psmart screws.png" attachment)
Then spudge the battery connector off as shown in the screen shot. (see "psmart issue.png" attachment)
Then re-seat the battery connector & it should begin to charge as normal, if so then put it all back together again.
I was tempted to buy a "USB charging dock" internal part or a replacement Battery. Neither was required.
Hope this helps someone else =)