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I’ve had this new screen and digitizer applied to my Pixel 2 XL and not white lines are covering the right side of the screen completely. [See Images] Any suggestions on a fix?

Hi, How long since the screen and digitizer were replaced? If not long ago (<30 days) and it was done by a reputable repair service, take it back and show them the problem. They should provide some sort of guarantee on their work. It may be a faulty screen which is not their fault but they should still repair it again. They would want to know about it if they were getting faulty parts from their supplier. If you did the repair yourself (or it was done by a friend), contact the supplier of the parts and ask them about getting a replacement screen and digitizer.