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MacBook Pro A1502 No green light on charger repair

From Repair Wiki
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)