As I start to send a text message the backlight goes out on the screen and I can't see anything. It won't light up again until the key pad lights have gone. I'm not sure what the problem could be- I recently replaced the screen (lines were appearing on the old one) and it worked well for a few weeks, but now has gone wrong.)

SOURCE: Sony Ericsson K850i screen & pad problems, please help !!

replaced the keyboard nd reflash the firmware on the phone.........take the phone to a mobile service shop and have it done

SOURCE: text messaging - cant send text messages

if you have nokia symbion phone so formate it and any brand you have for that you need to check sim center number or reset the phone

SOURCE: Black screen Sony Ericsson K850i

Hi,

I just had the same problem. I tried everything including resetting the whole phone upgrading the software etc etc.

I was convinced it was a softare problem, but my screen only went black when i press the buttons on one side of the keywpad so i started thinking it may simply be hardware related.

I tried taking off the case but didnt have the screw drivers to do this.

Eventually in a fit of rage I threw my phone on the floor (Carpetted floor) and too my surprise the problem got better! I basically gave my phone a few more whacks and it started to work fine again.

I am not suggsting you start whacking your phone, but i imagine if you took off the case and re-fitted it this would work.

Good luck.

Donald DCruz

• 17130 Answers
• Posted on Jul 13, 2011

SOURCE: My cellphone was good before.

The phone has hung up because there are errors in the software. So to reset remove the battery and the memory card from the phone. Using your PC , scan the memory card for any corrupt files or media files with virus- it is possible when they are downloaded from unsafe sites. If so remove or format the card. Now replace the card and battery and switch on the phone. If the phone hangs up then it is confirmed that the software is corrupt and will need a reinstallation. Seeking help from the authorized service /support centre is most ideal. Take estimate and decide.