MacBook Pro A1706 Question mark folder or SSD not recognized repair and MacBook Pro A1706 Charger stuck at 5V instead of 20V repair: Difference between pages

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(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 A1706 MacBook thumb|Figure 1 ==Symptoms== *Question mark folder *No external boot possible *Recovery does not work ==Solution== ====Check R9350==== * Examine R9350 (PICCOLO_IUVD) on the board ** Check if R9350 is no longer soldered to the board. ** Look...")
 
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{{Repair Guide
{{Repair Guide
|Device=
|Device=MacBook Pro A1706
|Affects parts=
|Affects parts=Motherboard
|Needs equipment=
|Needs equipment=multimeter, soldering iron, soldering station, thermal camera
|Type=
|Type=Soldering
|Difficulty=
|Difficulty=3. Hard
}}
}}
{{stub}}
==Problem description==
==Problem description==
Question mark folder, no external boot possible & Recovery does not work on A1706 MacBook
Charging voltage from USB-C charger is stuck at 5V instead of 20V.
[[File:Piccoloissue.jpg|thumb|Figure 1]]


For more information about this problem, check [[Charger stuck at 5V instead of 20V on MacBooks]][[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]]
==Symptoms==
==Symptoms==
 
*Not charging
*Question mark folder
*Most likely not turning on
*No external boot possible
*Drawing very little to no current
*Recovery does not work
 
==Solution==
==Solution==
 
*If 5 V and 0.00 A draw, most likely a 0–1 Ω short to ground on PP3V3_G3H
====Check R9350====
*PP3V3_G3H missing due to a short circuit on the input to PP3V3_G3H creation circuit
 
* Corroded LDO capacitor for PP3V3_G3H around a CD3215. On right side of board, check under shielding by SSD under the right CD3215 for hidden corroded capacitor. [https://www.youtube.com/watch?v=Wb5dkH_mTEc Example video] (PP3V3_G3H 1.5 V, also bad ISL9239)
* Examine R9350 (PICCOLO_IUVD) on the board
* PP3V3_G3H missing due to PM_EN_P3V3_G3H missing due to bad ISL9239 (U7000) [https://www.youtube.com/watch?v=Wb5dkH_mTEc Example video] (PP3V3_G3H 1.5 V, also corrosion at LDO capacitors next to CD3215)
** Check if R9350 is no longer soldered to the board.
* Bad U6903, responsible for creating PP3V3_G3H
** Look for any missing pad for pin 1 (PPVIN_2V7NAND_LB). Refer to Fig 1 for visual guidance.
* Diode providing input to U6903 is bad
* Inspect the area near R9350
* Bad C6905, C6906 capacitors around U6903
** Examine the trace coming out of Terminal 1 of R9350.
* Bad CD3215
** Be cautious about the neighboring via, as it can break the trace.
* Bad CD3215 ROM chip (U2890)
* Measure the resistance of R9350
* 300 mA for a few seconds then reboot (PP3V3_G3H present and working CD3215): corroded resistors around thunderbolt ROM chip (U2890 or UB090)
** Ensure it is within the specified range.
If the issue is a bad CD3215, one way to get an idea, is to see which does not boot loop. When you plug the charger in with the USB-C current meter, it will turn on for 2–3 seconds, then turn off and turn on again. Whichever port doesn't boot loop usually has an associated CD3215 that is bad. Also, the bad CD3215 will occasionally get hotter than the rest. [https://www.youtube.com/watch?v=pVg6Oxn9IUM Example video.]
* Look out for potential trace issues
** Sometimes, the neighboring via can damage the trace, resulting in connectivity issues. Check for broken traces and continuity problems.
** [https://www.youtube.com/watch?v=m6lTkZnykqo Example of a broken trace] (Fixed by running a wire to replace the broken trace)
** [https://www.youtube.com/watch?v=WbuRSUitwCw Be aware of potential bad probe points, which may look good at a cursory investigation]
 
==== Check the Piccolo circuit ====
the Piccolo circuit can be sensitive to any sort of water damage in its vicinity.
 
* Probe inductors near the Piccolo chip. If they are shorted, replace the Piccolo chip. Injecting 1.3 V on these inductors usually won't give you a strong hotspot.
* In cases of no liquid damage, if the SSD is dead, It's probably unfixable.
* Measure C9416, Q9401, or U9400 for short circuit, it often happens due to issues with U9400 circuit
* In rare cases, there may be no damage in the R9350 area, but the TP above R9350 may lack PPVIN_2V7NAND_LB. Check the continuity between that TP and pin 43 (PPVIN_2V7NAND_LB) of J9600. In such cases, consider running a jumper wire from the closest source of PPBUS_GSH (pin 1 C6582) to the testpad after which, the SSD should now be detected.
** After inspection and not finding any breaks in that PPVIN_2V7NAND_LB line, I deliberated on where to best access PPVIN_2V7NAND_LB from. I ran a jumper wire from pin 1 C9400 (PPVIN_2V7NAND_LB) and conformal coated that enameled jumper wire and considered it a viable repair.
* In other situations, a damaged trackpad cable can short PP3V3_S4_TPAD. This line goes through R5650 and then to R8901 as PP3V3_S4, and leaves as STORAGE_EN to go to J9600 lifeboat connector. It continues as STORAGE_LB_EN and goes to U9300 as its EN line. U9300 is the PMIC for SSD. Replacing the trackpad cable may resolve the issue.
* If the issue persists, and there was a history of liquid spill on the keyboard, disconnect the keyboard as it may be causing the problem.

Latest revision as of 18:59, 30 October 2023

MacBook Pro A1706 Charger stuck at 5V instead of 20V repair
Device MacBook Pro A1706
Affects part(s) Motherboard
Needs equipment multimeter, soldering iron, soldering station, thermal camera
Difficulty ◉◉◉◌ Hard
Type Soldering


This article is a stub. You can help Repair Wiki grow by expanding it


Problem description

Charging voltage from USB-C charger is stuck at 5V instead of 20V.

For more information about this problem, check Charger stuck at 5V instead of 20V on MacBooks

Example image (Figure 1) -- No image yet. Help expand this page by uploading it!

Symptoms

  • Not charging
  • Most likely not turning on
  • Drawing very little to no current

Solution

  • If 5 V and 0.00 A draw, most likely a 0–1 Ω short to ground on PP3V3_G3H
  • PP3V3_G3H missing due to a short circuit on the input to PP3V3_G3H creation circuit
  • Corroded LDO capacitor for PP3V3_G3H around a CD3215. On right side of board, check under shielding by SSD under the right CD3215 for hidden corroded capacitor. Example video (PP3V3_G3H 1.5 V, also bad ISL9239)
  • PP3V3_G3H missing due to PM_EN_P3V3_G3H missing due to bad ISL9239 (U7000) Example video (PP3V3_G3H 1.5 V, also corrosion at LDO capacitors next to CD3215)
  • Bad U6903, responsible for creating PP3V3_G3H
  • Diode providing input to U6903 is bad
  • Bad C6905, C6906 capacitors around U6903
  • Bad CD3215
  • Bad CD3215 ROM chip (U2890)
  • 300 mA for a few seconds then reboot (PP3V3_G3H present and working CD3215): corroded resistors around thunderbolt ROM chip (U2890 or UB090)

If the issue is a bad CD3215, one way to get an idea, is to see which does not boot loop. When you plug the charger in with the USB-C current meter, it will turn on for 2–3 seconds, then turn off and turn on again. Whichever port doesn't boot loop usually has an associated CD3215 that is bad. Also, the bad CD3215 will occasionally get hotter than the rest. Example video.