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MacBook Pro A1706 Critical Software Update failed to install

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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

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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.


Repair Steps