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If it is NOT TURNING ON,.. PLEASE try:
1.Go to PC companion -> Sony Update Service and select phone update without connecting your phone.
2. Select your device and download the update (DONOT CONNECT PHONE)
3. When the download completes it will prompt for connecting you phone.
4. Before that phone must be switched OFF (donot turn on).
JUST PRESS DOWN THE VOLUME DOWN KEY AND CONNECT THE USB CABLE.
5. The Phone's LED will glow green and the update for phone will start.
6. After the update completes you will get the phone as an fresh new Operating System.
(WARNING - YOU WILL LOOSE ALL YOUR DATAS AND GET A FRESH START)
Usually 2 to 3 hours BUT
Ifthe cell phone battery is more than 3 - 4 years old then the battery could be wornout. Rechargeable batteries have a finite number of charge and discharge cyclesand will lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up atall.
ORThe battery shows a 100% charge but when the adapter is disconnected thebattery drops off to zero capacity in a very short time.
Ifthe battery drops to an unacceptable charge level then the battery needs to bereplaced.
Unfortunately Sony Ericsson would not swap or repair this phone, as it just too old, well outside of warranty. It sounds like the charger block itself may be faulty, if it is, it should be pretty easy for a technician to repair it.
in sony k550i mobile phone battery will not charge through monile charger i will check the charger but it is ok. when charger is connect to mobile then show on charging box make a charge but achually charging is dcressing.