SE K800 Backlight Problem

I just changed my K800 Firmware from RED52 R1JE001 to RED52 R8BF003 APAC, some bugs was removed and fixed from my phone, but other than that another problem was recently added.. It's LCD backlight won't even turn off or go to sleep mode.. It remains turned on, it's a waste of battery of course.. I tried to flash it again but it remained the same.. So is there any way to tweak my phone and change what had happened? :confused:

did u check tat any keys(including side keys) remains pressed??