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| MacBook Pro A1706 Critical Software Update failed to install | |
|---|---|
| Device | MacBook Pro A1706 |
| Affects part(s) | Main Logic Board, Touch Bar, Touch ID |
| Needs equipment | Soldering iron, hot air station, solder paste, reball equipment, multimeter |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering, Part replacement |
Problem description
Symptoms
- Symptom 1 (Figure 1)
- Symptom 2
Solution
Diagnostic Steps
- Bad Touchbar. Unplug Touchbar and try to update again.
- Bad camera caused by Flexgate, unplug LCD and try to update again on external display.
- Bad touchID, the T1 chip controls the touchID so in theory a bad touchID could cause this error although unconfirmed.
- Format drive and install MacOS. If data is required, boot into safe mode by holding shift and transfer data off.
- If you have tried all of that, then it is most likely a board related issue caused by either bad PMIC or bad T1 chip. Measure all U4200 buck outputs.
- PP1V8_Sleep3_Buck3 pulled down by corrosion under U4200/T1 PMIC. Fixed by reballing PMIC. This was also causing the Macbook to take a long time to post.
- Additional Troubleshooting steps - https://logi.wiki/index.php/Critical_Update_Required_Troubleshooting
- Could be as well a problem with the T1 chip. It will also cause the machine to take a long time to post.
- Check each pin on Touch Connector J4402 and compare the numbers to OBD.
- Check each pin on Display connector J4401 and compare the numbers to OBD.