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| MacBook Pro A1990 Not turning on, with trackpad vibrating repair | |
|---|---|
| Device | MacBook Pro A1990 |
| Affects part(s) | Motherboard |
| Needs equipment | multimeter, soldering iron, soldering station |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
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Problem description
The MacBook seems braindead because the trackpad is reacting for 20-30 sec and then it stops and On again. On the USBC multimeter we see boot looping from 0.06 to 0.14, at 0.06 the trackpad is not vibrating and on 0.14 is vibrating. Randomly the MacBook starts but for no obvious reason and works fine, once shut down it will not restart
Symptoms
- Randomly the MacBook starts but for no obvious reason and works fine, once shut down it will not restart
- Vibrating trackpad
- On the USBC meter we see boot looping from 0.06 to 0.14A at 20V
Solution
- U3000 is faulty (getting warm, 38-40 degrees Celsius)
- Replace U3000 (Figure 1)
After replacement, the MacBook should work properly.