MacBook Pro A1990 Question mark folder repair

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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

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