Chosen Solution

After reassembling screen to phone (after loud speaker replacement), screen now has dim white vertical lines on right side. I double and triple checked the ribbon connectors but all seems to correct. Any ideas on what has happened and how to fix?

The connection isn’t good or you have damaged the LCD. I get it often and is solved by just pressing the connection. Have the screen on and tilt the screen up so you can press on the connection and see the screen at the same time to see if the lines go.