Chosen Solution
Hello Community, I am having an issue with my MacBook 13 inch. I’ve kept it in very good condition over the last 8 or so years but it has recently developed an issue where very faint lines appear across the bottom right hand side of the screen. They disappear when the screen is moved slightly or closed-and-reopened. These lines do not appear on external displays. Pictures with and without are attached, along with more system details. I am available to give more information if needed. https://s4.postimg.org/hsv9v0p31/Screen_… https://s4.postimg.org/j5cywwmil/IMG_201… https://s4.postimg.org/4nfrowv7h/IMG_201…
Either a problem with the PCB attached to the LCD or LCD cable. If you have a heatgun and are confident you can remove the glass without cracking, you can find a guide to accessing the LCD here MacBook Unibody Model A1278 Front Display Glass Replacement Otherwise, replace the whole top lid and your issue will be resolved.
What you are seeing it the delaminating of the electrical contacts from the LCD glass panel (called a TAB error). Often we see wide lines as the display was banged or something heavy was placed on the lid causing stress between the glass and the cable that is attached to the glass to carry the signals to the LCD. In your case it appears only a few lines broke which could have been a manufacturing defect that took this long to show up. You can live with it or replace the complete lid assembly. Here’s the IFIXIT guide to replace it: MacBook Unibody Model A1278 Display Assembly Replacement
