N900 dead?
 

So on new years eve I let my n900 charge because it's battery was depleted, everything looked fine because the NOKIA logo on white screen showed up, so i just let it charge for a half hour - hour, then i went back to see what's up for some messages, then i came to the conclusion that my screen was just black, nothing that bad i thought, i just plugged it out and then back in, still nothing happen...

So now i'm sitting here with a dead n900 and i have no idea what's wrong, nothing happens when i put in the charger, nothing happens when i put in my pc cable, just nothing happens at all.





Thanks in advance.

Re: N900 dead?
 

If you take out your battery and then reseat it does that make any difference? Mine has jiggled loose from the contacts once before and it did the same thing so that's the first to check. If not....it could be rather more complicated.

Re: N900 dead?
 

It is only temporary, I hope. Just take out the battery and put it back again. Then charge it. It will problably work then. See other information in this forum.

Re: N900 dead?
 

same is happening with me and i hav not even used it..i just switched it on..saw d look n feel...then switched it off and kept for charging..can someone suggest what to do?

Re: N900 dead?
 

Try to take out the battery for a while, then press and hold the power button for 30 seconds or so.. Wait a bit then plug the battery back in.. Then hook the charger back into the N900 and see what happens.. Hope this works out for you!

Re: N900 dead?
 

Tried it, didn't work unfortunately, i tested out the battery to see if it wasn't dead, but my tester gives me 2.75v so that's not the case.

any more ideas?

Re: N900 dead?
 

Hi, are you sure about that? At least on my battery, the badge shows 3.7 volts.

-stefan

Re: N900 dead?
 

2.75v may not be sufficient charge to power the device. When the phone is trying to turn on the draw from the battery would make this value a lot lower again.

It's either a phone problem or more likely a battery problem. I can run my phone completely dead and have done so 5 or more times now and it charges back up without issue.

Edit: Just tested my battery then and even at 31% battery capacity remaining according to the device my volt meter reports a charge of 3.47 volts.

Re: N900 dead?
 

How do you mean? First you say that the power is insufficient to power the device, then you say you can run yours when it's completely dead?

Correct me if I'm wrong though.


thanks.

Re: N900 dead?
 

What I meant is I can run the phone completely flat so that it turns its self of because of a flat battery. I have read of others doing this and have not been able to get their device to charge afterwards.

Re: N900 dead?
 

Yeah I heard that the charging doesn't go directly to the battery, but first through the CPU and then too the battery, isn't there some way i can charge my battery directly without putting it in my n900 ?


thanks.

Re: N900 dead?
 

The problem is the N900 is the worst bug riddled phone Nokia have ever made. Since I got mine I have had the same problem as you. also cant use thee 4th view because the wallpaper is stuck with an unwanted pic, and there is no fix for this from Nokia. It also stops responding when it feels like it. This morning after making a phone call, it just froze up on me and i could not end the call. The screen then went black then back on with the same frozen screen. Nokia need to sort this crap out. How could they release the N900 with all these bugs?

Re: N900 dead?
 

I knew it would be stuck with bugs when I pre-ordered it, that's what linux is for right? having fun fixing all the bugs yourself? but not charging is a serious problem.


thanks.

Re: N900 dead?
 

Something like this would be fine. You may be able to get one for the N900 on eBay.

http://www.mobilefun.co.uk/nokia-n97...dle-p19856.htm

Re: N900 dead?
 

are you using USB cable to computer or normal charger? My observation is that my notebook can't charge the n900 via data cable when it's battery-dead.

Re: N900 dead?
 

Tried both, well all 3 actually, the usb charger, the usb cable, and the adapter for "older" chargers.

The adapter for older chargers was the one that "killed" my n900 actually.


thanks.

Re: N900 dead?
 

So it was charging fine before you used the adaptor? Did it come with the phone? Mine didn't have one. Perhaps the other charger you used damaged the phone or just the battery hopefully.

Re: N900 dead?
 

Exactly, and yes it came with the phone.

thanks.

Re: N900 dead?
 

Where did you buy yours from? Got mine from Amazon but again mine didn't come with a converter and Amazon doesn't list this as part of the retail package. Do you know anyone with a X5800 express? That phone uses the same battery as this one. May even be worth getting testing another battery in it at a phone store to rule that out.

Re: N900 dead?
 

Not sure if it will help here, but it is worth having a "universal" li-ion charger.

There is one here for $2:
http://www.dealextreme.com/details.dx/sku.15264
http://www1.dealextreme.com/producti...ku_15264_1.jpg

Re: N900 dead?
 

did they old charger with adapter kill it because it sends a higher voltage than the standard usb 5v?

Re: N900 dead?
 

yes thats what i did..i took out my battery and charged it by putting it in my friends 5800 and the battery charged fine..i think its right when ppl say that the charge goes thru the cpu first b4 going to the battery that is...and since my phone is bricked that is y it is not charging..now what i'll do next is fully charge my battery in 5800 and then try reflashing it..and then i'll charge it inmy n900 and see if it charges fine

Re: N900 dead?
 

I had the same happen to me. I left the phone charging overnight
connected to my laptop. I think my laptop went to suspend and
in the morning the phone wouldn't show any signs of life.

I didn't have an external charger so I brought the phone to a local
Nokia care center and they said that if they don't spot the problem
there they have to send it forward for repairing which could take from
3 to 6 weeks. :(

I'm nevertheless interested in hearing if someone finds out the
actual reason/solution for the problem. So please don't forget to
post if you happen to succeed. :)

Re: N900 dead?
 

Smartphoneshop.be,

the adapter is called CA-146C http://europe.nokia.com/MEDIA_BANK_1...6C_240x240.png

Yeah but almost all old chargers are more then 5v, so why would they include it then?


Now something totally different, I had some alike problem with my PSP, and i had to short-circuit my battery, it's a dangerous solution but it worked fine.

But I'm not gonna try it with my battery if i don't got any background information about it

Re: N900 dead?
 

2.75V is too low for the device to run on (and it can't run on power from charger), and it needs to run in order to charge..

3.2V is probably the lowest the battery can/should go..

Re: N900 dead?
 

Thanks for the info, where did you get this though?

Re: N900 dead?
 

I have had the same problem, put my N900 via USB to the PC. Before I put the PC to sleep the N900 showed a green light (so it was fully charged). Next day the N900 was completely dead and could not be brought to live again. Plugging in the AC charger and removing/putting in the battery did not work.

I suspect that the USB connection to a PC in sleep mode is draining the battery completely (is a bug/problem I think).

Connecting the AC adapter to the N900 requires the software to react (to switch to charging mode), which requires the N900 to have a bit of voltage left (is also a bug/problem I think), which it does not not have because it is fully drained.

At the end I took a 5 volt AC adapter and stripped the 5 volt wires, plugged it into AC power and hold the two wires to the + and - of the battery (minus wire to the + pole, plus wire to the - pole). After a few minutes the battery had just enough power to switch to "recharging mode" after putting it back to the N900 (still connected to the AC charger).

It worked for me, but no guarantees of course...

Good luck...

Re: N900 dead?
 

Sorry but, why the minus wire to the + pole and vica versa?

Re: N900 dead?
 

He said AC not DC - hopefully that was a typo too!
Maybe it was Guy Fawkes day? (insert your local pyrotechnic occasion). Just putting 5V on the cell is dangerous enough. Though the protection chip should have helped.

My story:

I found the n900 turned off - probably low battery. But it would not come on with the charger connected, even though the charging light glowed. Charged a while, still would not start. Eventually I took the battery out and measured 3.45V, so presumably it had indeed been charging.

I put battery back and it worked. Why would I have to remove & replace battery to get it back on after running flat?

Re: N900 dead?
 

Leave the phone on the charger for a considerable amount of time, try overnight. Take the battery in and out, try again. Definitely invest in an external charger, there are many available for the 5800 which uses the same battery as the N900. Sounds like the battery is completely dead and is not getting enough power to the cpu to charge properly. I wouldn't go as far and say the device is dead, just a battery issue it sounds like.

Re: N900 dead?
 

Oh well it's already on its way to Nokia, will probably get a new one or my repaired one next week. God i'm missing it so hard :(

Re: N900 dead?
 

It would not charge the other way...

Re: N900 dead?
 

Nice to know you still have all your fingers, but I'd check the polarity with a multimeter before doing that again!

Re: N900 dead?
 

did you install windows on it? ::snickers:::D

Re: N900 dead?
 

Left transmission running over night and the charger wasn't plugged into the socket properly. Woke up this morning to a drained phone. Plugged it into the charger and it showed the Nokia logo. Tried turning it on 20 minutes later and it wouldn't turn on. Left it off and charging all day. Came home, took out the battery, waited 2 minutes, held down the power button on the N900 for about 20 seconds. Plugged in the battery and it turned on just great.

Thanks for the solution.

Re: N900 dead?
 

Yay! I helped at least one person! :)

Re: N900 dead?
 

The worst thing you can do to a Li-ion battery is to run it flat. My N810 I charge every night even if barely used. Li-ion batteries respond well to being topped off unlike Ni-cads which were better performers if run dead before charging.

Re: N900 dead?
 

Except that you cannot do it.
They have a built-in chip to prevent over-discharge. That aside, Li_Ions don't care much if they are used deep-cycle, or frequent top-ups, do they?
Its the old lead-acid batteries that last longer if kept topped up. Actually, the shelf life of Li-Ions is better if stored partially discharged.

Re: N900 dead?
 

It's my understanding that you get more charge cycles if you top off than run it way down. I've also read that storage is better in a partially discharged state but I don't know how that relates to daily use the way I do it.

Re: N900 dead?
 

Yup, I charge my n900 every night too. And even in car over day, while I listen to FM transmitter so I must plug it in and charge so transmitter is like 50% stronger.. My battery is hardly ever under half of its life.
And about that happened to your phone over night,.. I would just take it back where I bought it and ask for repair or new one.