MacBook Pro A1502 2015-2016 Not turning on (Orange LED and 180 mA current draw) repair

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MacBook Pro A1502 2015-2016 Not turning on (Orange LED and 180 mA current draw) repair
Device MacBook Pro A1502
Affects part(s) Whole board
Needs equipment multimeter, soldering iron, soldering station
Difficulty ◉◉◉◌ Hard
Type Soldering


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Problem description

180 mA from the charger, the charger light stays orange and machine does not turn on

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Symptoms

  • Not turning on.
  • Only 180 mA current draw from the charge port.

Solution

Corrosion at U5400 current sensing (R5400) circuit PP3V3_SO_HS_COMPUTING. This device makes power for the stages of CPU_VCORE. U5400 signals the SMC.

  • Corrosion for U5400 was removed.
  • Jumper wires were added to replace the faulty traces at U5400.
  • U5400 and current sense resister restored.
  • U7400 (Voltage regulator) chip was replaced and surrounding circuitry restored.
  • Backlight circuitry and other areas cleaned up (corrosion).

Example video

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