My computer is showing large, vertical purple lines (and one grey/green one) but only when I open the screen past 25 degrees. When I close the screen below 25 degrees, everything works fine. I have had a few different problems with this computer in the past which have been fixed under repair programs (keyboard replacement and display backlight repair).
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Well, thats a bit of good news! Your display is only effected.
You likely cooked your T-CON board which has been a problem in this series. Sadly, it’s been a big problem so you can only get new display assemblies!
Here’s the guide to replace it: Reemplazo del ensamblaje de pantalla de MacBook Pro 13" Function Keys de finales de 201
Here’s a bit more on the why Screen issues - white/negative screen fixes itself after update In your case the tilting of the lid is either cutting off the air flow or adding stress to the T-CON board connections.
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What does an external display show you? Do you see a clean image.
- de Dan
@danj ya it works fine when hooked up to my tv
- de Daniel Madden