LED TV vertical lines after turning on for 5 minutes

less than a year ago my samsung led tv model UA32D5000PR started having vertical lines after turning on the tv.. the lines will last for around 5 minutes then it will disappear and picture will be ok.. it's like it needs to warm up first.. the lines appear every time the tv was turned off then on again.. the lines seems to disappear faster if the tv is already warm..

however, just yesterday the lines wont disappear anymore even if the tv is turned on the whole day.. i tried cleaning the ribbon from main board to tcon board (lvds ribbon i think) but the lines still there.. please help thanks