MacBook Pro A1502 No green light on charger repair

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MacBook Pro A1502 No green light on charger 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

#incomplete

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Symptoms

  • Green light on charger not turning on

Solution

This problem has multiple causes:

  • ADAPTER_SENSE not 3 V due to bad DC in board. 16–20 V on ADAPTER_SENSE means charger voltage is leaking into ADAPTER_SENSE, below 2 V means it is missing usually due to a bad DC In board.
  • PP3V42_G3H missing
  • SMC not working(if SMC is off, you will have 12.23 V on PPBUS_G3H instead of 12.56 V) because it is dead, not turning on(SMC_RESET_L low).
  • Corrosion of the SMC's solder connections
  • Keyboard bad, shorting PP3V42_G3H to ground or power button stuck on.
  • Bad U7000
  • Bad U7001
  • Bad U7100 — indicators: PPBUS_G3H Below 4 V, board taking 40 mA, U7100 getting warm (check via thermal camera)
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