Sony Ericsson won't switch on Battery is charged

To Unlock Sony Ericsson K850 use unlock code.Visit the site
Superunlockcodes.com
get Unlock code and Follow the unlocking instructions below and unlock it easily.

Sony Ericsson K850i Unlocking InstructionsWarning : Do not enter any wrong unlock codes on your Sony Ericsson K850i mobile phones. If you enter over a certain amount of wrong unlock codes on your Sony Ericsson K850i mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch ON your Sony Ericsson K850i without any SIM Card,
2 - Press the left arrow key/button once,
3 - Press the button * twice,
4 - Press the left arrow key/button once,
5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you want to unlock)
6 - Enter the Unlock Code.

Try reading K850i Firmware Overview.. There are some issues with firmware. Such as random reboots and BROD (Blue Ring of Death) i was recently victimized by this BROD. 037 firmware is the most stable firmware so far.. i would advise you also to downgrade your firmware first until SE releases a new and more stable firmware..

Your battery is either not charged or the battery cell is completely gone.

I'll advice that you get another battery and give it a trial, also look out for the charging port. Check if it is not rust in any way because, if the charging port is rust, it will be difficult for the charger to contact the charging port.

I believe what's wrong with your phone is a minor fault, just do a thorough check and you will find a solution to the problem.

Best wishes.

You need a new battery, The battery has been used up too many times.

Was the phone fully charged??? Did you removed battery after update was finished???

two cases
1. Battery is uncharged. Charge your battery.
or
if above does'nt helpthen i think there is problem with your battery.

CPU faulty send it back to Sony Ericsson for repairs, this is a common problem on Siny Ericsson very bad.

There are no free tools available to unlock the phone.

You can use this website they would charge you lesser than your service provider.

http://www.uniquephones.com/Sony-Ericsson-K850i-Unlocking.html

u r charging ic has been damaged u need to replace the board or check the battery output pins it must be 3.6volts

the problem is wit the battery... change ur battery... everythin wil be rite