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MacBook Pro A1990 Question mark folder repair

From Repair Wiki
MacBook Pro A1990 Question mark folder repair
Device MacBook Pro A1990
Affects part(s) Motherboard
Needs equipment multimeter, soldering iron, soldering station, thermal camera
Difficulty ◉◉◉◌ Hard
Type Soldering, Software


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Problem description

Question mark folder, no external boot possible & Recovery does not work on A1990 MacBook

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Symptoms

  • Question mark folder
  • No external boot possible
  • Recovery does not work

Solution

- Check U9080, U9580, U9000 & U9500 and SSD power rails PP2V5_NAND_SSD0, PP2V5_NAND_SSD1, PP0V9_SSD0, PP0V9_SSD1, PP1V8_SSD0, PP1V8_SSD1

- Flash T2, Update Intel Mac T2 BridgeOS Firmware, Boot Mac into DFU Mode Then Reinstall MacOS Via Recovery CMD R