| MacBook Pro A1989 "Braindead" repair | |
|---|---|
| Device | MacBook Pro A1989 |
| Affects part(s) | Motherboard |
| Needs equipment | multimeter, soldering iron, soldering station, thermal camera |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering, Micro-Soldering"Micro-Soldering" is not in the list (Soldering, Teardown, Part replacement, Cleaning, Software, BGA, General) of allowed values for the "Repair Guide type" property. |
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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.