MacBook Air A2179 Not turning on, pulling ~180-220 mA then going down to 20 mA at 5V repair

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MacBook Air A2179 Not turning on, pulling ~180-220 mA then going down to 20 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 turning on, 180-220 mA usage before going down to 20 milliamps, P5VG3S_EN missing. All rails below PP5V_G3S are present.

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Symptoms

  • MacBook not powering up.
  • Drawing 180-220 mA then going down to 20 mA at 5V as measured by a USBC meter.
  • P5VG3S_EN missing.
  • All rails below PP5V_G3S are present.

Solution

The PMIC is dead, U7800 (Figure 1). Replace it.

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