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- - 810 keeps rebooting, wont go past white nokia screen (https://talk.maemo.org/showthread.php?t=23897)

Re: 810 keeps rebooting, wont go past white nokia screen

Quote:

Originally Posted by derekp (Post 756296)

I've recently let the battery go down on my n810, it was sitting around for a month or two (I know, shame for neglecting the device). Of course, same issue -- white screen, reboot, white screen, etc.

My fix -- take out the 3.6 volt battery from my cell phone, hook wires to the battery terminals and jumper them to the n810 battery. Sort of like jump-starting it. Had to hold it in place for about 5 - 10 minutes till I had enough charge, put battery back in n810, which was just enough to get it to boot into the charging program. Now it is fully functional again. Whew.

Disclaimer: I am not recommending this to anyone, as charging a lithium battery from an unregulated source can be hazardous and may cause an explosion. In my case I was constantly monitoring both batteries temperature, but I could see the potential for a problem.

Oh, and for extra geek points, I didn't have any wire with me at the camper. Did have aluminum foil though, which made for some nice and dangerous uninsulated conductors. Sometimes I'm surprised I still have all 10 fingers.

Well there are 2 type of electric current... AC and DC
AC currents should be safe when touch as they would need a strong conductor and need a direct connection to their reversed side... + to - while direct currents should shock you as long as you have at least a conduction to it... Like power outlet to your homes and your grounded to the soil or any other conductive materials. :D

Re: 810 keeps rebooting, wont go past white nokia screen

That is probably one of the most misguided and unclear things I've read about electricity in a long time. AC doesn't need any stronger conductors than DC, if anything it's the opposite...

Both DC and AC need two conductors. The powergrid is grounded to the earth, so anything with a low resistance path to ground can serve as one conductor.

As for danger, it's all about current through your body, and that depends on the voltage. For a given voltage, AC is probably more dangerous. The battery's 3 - 4.2V poses no electrocution danger.

The danger in the above case of the battery is not that you'd electrocute yourself, the danger is when using uninsulated wires that you'll accidentally let them touch eachother, which will lead to a short circuit, which can make the battery explode.

As for dapenzerg the lower voltage of 5.2V (compared to Nokia chargers' 6V or so) and the lower current of 500mA is probably what helped. The reason it reboots with a crap battery is that the hardware can't regulate the charge current low enough, which results in overvoltage on the battery. which makes the charger software abort, which makes dsme reboot the device.

Re: 810 keeps rebooting, wont go past white nokia screen

shadowjk my N800 and N810 old chargers were 5V, and I did the opposite to your method, that is I increased the voltage.

Re: 810 keeps rebooting, wont go past white nokia screen

A N810 will actually reject 5.00V. it accepts 4.2V - 4.8V and 5.2V - 10V or so, with varying current profiles (a 10V 1A charger is rejected but 10V 0.1A might be accepted).

The dc adapters are labeled 5V, but they actually give out somewhere between 5.2 and 8V. 5.8-6 is the most common I've seen.

Re: 810 keeps rebooting, wont go past white nokia screen

Good info, I will check my chargers with a voltimeter, because I was trusting in the labeled voltage.

How do you check the output voltage? when the charger is connected to the Nokia device?

Quote:

Originally Posted by shadowjk (Post 900323)