Xperia neo v screen problem.

[Crazytails]

Hello everyone. i have an experia neo v and my problem is that the screen works normaly on the boot but after that the brightnes isnt stable. If i lock my phone and try to wake it up the screen remains black but touch works normally. when i try to use update center i get the mesage that the phone has modified software and cannot be upgrated. same when i try to repair from pc companion. i have found the stock .ftf files at xda developers flash it with flashtool but the problem still occurs. i have tried preveous and latest versions of software. thank you.

[Johan]

Have you unlocked the boot loader?

[Crazytails]

yes via sony official website

[Johan]

It's hard to say what may be causing the problem but if the boot loader has been unlocked the phone can't be flashed using SUS or PCC. In this case I think the phone needs to be examined by a repair center to get it fixed. But since the boot loader has been unlocked you may want to contact your local support team for more information about your current warranty condition.

http://www.sonymobile.com/global-en/support/contact-us/contact-info/

[Crazytails]

i just get informed that the repairwill cost 220 euro..... added to this they refused to answer my question about the reason of this high cost and the faulty parts that need repair.... i am  very disapointed......The phone was given to vodafone customer care.