| MacBook Air A2179 Not turning on, pulling 0 mA at 5V repair | |
|---|---|
| Device | MacBook Air A2179 |
| Affects part(s) | Motherboard |
| Needs equipment | multimeter, soldering iron, soldering station |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
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Problem description
MacBook not powering up, SLPS2R and AWAKE voltages/signals all 0, PP3V3_G3H 0.9V, PP3V3_G3H_RTC 3.3V.
Symptoms
- MacBook not powering up.
- SLPS2R and AWAKE voltages/signals all 0.
- PP3V3_G3H 0.9V, PP3V3_G3H_RTC 3.3V.
Solution
PMU_VDD_HI signal is not reaching U7800 (figure 1) due to corroded R8050 (figure 2).