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| MacBook Pro A1989 "Braindead" repair | |
|---|---|
| Device | |
| Affects part(s) | |
| Needs equipment | |
| Difficulty | |
| Type | |
Problem description
Any shorted subrail on A1990 machines can cause the machine to hang on POST.

Symptoms
- MacBook hanging on POST
Solution
- Thermal imaging can reveal abnormal heat caused by a shorted component.
- This condition is most frequently caused by a SSD subrail, such as the 2v7 SSD power line.