| 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, Micro-Soldering"Micro-Soldering" is not in the list (Soldering, Teardown, Part replacement, Cleaning, Software, BGA, General) of allowed values for the "Repair Guide type" property., Software |
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Problem description
Question mark folder, no external boot possible & Recovery does not work on A1990 MacBook
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