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MacBook Pro A1990 Not turning on, short on PPBUS G3H repair

From Repair Wiki
MacBook Pro A1990 Not turning on, short on PPBUS G3H repair
Device MacBook Pro A1990
Affects part(s) Motherboard
Needs equipment multimeter, soldering iron, soldering station, thermal camera
Difficulty ◉◉◉◌ Hard
Type Soldering


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Problem description

Repair of a common short on PPBUS_G3H on an A1990 MacBook Pro

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Symptoms

  • MacBook not turning on.
  • Less than 10 Ohms on PPBUS_G3H as measured with a multimeter (short)
  • Very low current draw from the charging port at 5V

Solution

Short on PPBUS_G3H

Inject 1V (increase if no reaction), watch for hot spots with thermal cam. Usually it's a bad tantalum cap

Measure PPBUS_G3H to vCORE coils (coils around CPU/GPU) IF those measure UNDER 1Ohm (0.3-0.8) then you most likely have a direct 12V short to CPU/GPU. On this board this situation is always a no fix.