This MacBook Air screen came in with the report of a hard hit to the bottom left of the display. I warned the client that a white spot would likely be present after the repair due to the hit being so hard.
White spots can be caused by the pressure from a hit going all the way through the LCD panel and marring the white sheet that sits behind the LCD panel itself. Basically there is a white sheet of a material that is almost like glossy paper. The backlight of the display shines from the bottom of the display along that white sheet and the white sheet reflects the light through the LCD panel into your eyes.
When the backlight sheet is damaged, you can visibly see a white spot where the sheet has been dimpled or damaged in some way. The white spot will not get worse with time, and is purely cosmetic. Some people can live with cosmetic defects without a second thought, while others will notice it every second of every day and it can drive them crazy.
In this case the customer provided photo and description of the issue let me to believe that the backlight sheet would be damaged and there would be a white spot after the repair. But once the repair was complete I saw that if there was a white spot, it was so insignificant I couldn’t see it!
The customer was willing to live with a white spot on the screen (especially since it would be where the display was damaged all the way at the bottom left of the screen), but they were very pleased to receive the computer back without any noticeable defect and a fully working display.
If you hav a cracked MacBook Air screen and you need to get it repaired, please consider having me replace just the LCD panel to help save you money on the repair. Let me know if you have any questions at all!