(Created page with "{{stub}} {{Repair Guide |Device= |Affects parts= |Needs equipment= |Type= |Difficulty= }} ==Problem description== Question mark folder, no external boot possible & Recovery does not work on A1990 MacBook thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it! ==Symptoms== *Question mark folder *No external boot possible *Recovery does not work ==Solution== - Check U9080, U9580, U9000 & U9500 and SSD power ra...") |
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{{Repair Guide | {{Repair Guide | ||
|Device= | |Device=MacBook Pro A1990 | ||
|Affects parts= | |Affects parts=Motherboard | ||
|Needs equipment= | |Needs equipment=multimeter, soldering iron, soldering station, thermal camera | ||
|Type= | |Type=Soldering, Software | ||
|Difficulty= | |Difficulty=3. Hard | ||
}} | }} | ||
{{stub}} | |||
==Problem description== | ==Problem description== | ||
Question mark folder, no external boot possible & Recovery does not work on A1990 MacBook | Question mark folder, no external boot possible & Recovery does not work on A1990 MacBook | ||
Latest revision as of 15:27, 29 October 2023
| 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 |
This article is a stub. You can help Repair Wiki grow by expanding it
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