MacBook Pro A2289 Not turning on, drawing 0.03-0.06A at 20V repair and MacBook Pro A2338 camera not detected after history of liquid damage repair: Difference between pages

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{{Repair Guide
{{Repair Guide
|Device=MacBook Pro A2289
|Device=MacBook Pro A2338
|Affects parts=Motherboard
|Affects parts=Motherboard, Camera, Display assembly
|Needs equipment=multimeter, soldering iron, soldering station
|Type=Soldering, Part replacement
|Type=Soldering
|Difficulty=3. Hard
|Difficulty=3. Hard
}}
}}
{{stub}}
{{stub}}
==Problem description==
==Problem description==
No Power, 20v and ~0.03-0.06A current draw on the 820-01987 logic board diagnosis and repair.
No camera detected after a history of liquid damage on the 820-02020 logic board.
[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]]
 
==Symptoms==
==Symptoms==
 
*Camera not detected.
*MacBook not turning on
*Possible signs of liquid damage.
*Pulling ~0.03-0.06A current at 20v from USB-C as measured by USBC meter


==Solution==
==Solution==
===Diagnostic Steps===
===Diagnostic Steps===
[[File:Placeholder image.jpg|thumb|(Figure 1) -- No image yet. Help expand this page by uploading it!]]


==== Check for DFU or Recovery Mode ====
====Corroded TCON connector with corresponding short on the display (LP610 will also be blown)====
*Check continuity on LP670.


* Connect the MacBook Pro A2289 to another Mac or MacBook via the master port (top left side USB-C port, closest to the display).
# Place your multimeter in continuity mode and measure across the component. LP610 is a filter, so it is essentially a wire. Your reading should be close to 0.01. You will often find this component visually exploded/burned with adjacent trace damage. Usually, there will also be corrosion on the display camera connector which will require replacement of the connector and sometimes the entire display assembly (left side of the primary display connector). If LP610 measures normally, proceed to the next steps. If LP610 is blown or burned, proceed to the "LP610 blown or visibly burned repair steps" below.
* Use Apple Configurator 2 to verify whether the device is in DFU or recovery mode.
* If the device is in DFU mode, proceed to "Device stuck in DFU mode due to corrupt firmware" in the repair steps below.


==== Check for a short to ground on PP3v3_S5 ====
====Blown 5v supply filter (LP610)====
If a short to ground is found, proceed to the "PP3v3_S5 short to ground" repair steps below.
*Always inspect the camera connector/cable on the display if this filter is blown.


==== Check resistance to ground on PP2v5_NAND_SSD_0 ====
*Check camera function with a KNOWN GOOD display.
Normal values can be as high as >1MΩ or as low as 60Ω. In the case of SSD/NAND failure, resistance will usually be between 1-3Ω.


==== Inspect U9000 for corrosion. ====
# You don't have a board issue until you know you don't have a parts issue. If LP610 measures normally, test with a known good display and display cable, or place the board in a known good housing. If the camera works normally with a different screen/enclosure, the display is the issue and will need to be replaced. BE SURE TO CHECK LP610 FIRST!
The location of the chip on this board makes it prone to corrosion, either from liquid ingress or from condensation from dust collection.
 
U9000 can be reballed if corroded which will likely resolve the issue if it is corroded.


===Repair Steps===
===Repair Steps===


==== Device stuck in DFU mode due to corrupt firmware ====
====LP610 blown or visibly burned====
 
Understand that this fault occurred because of a catastrophic short within the TCON board of the display. If you replace LP610 without addressing the display issue, LP610 will fail again.
* Revive firmware via Apple Configurator 2.
* Ensure the MacBook is running the latest macOS version for consistent results. Check for MacOS updates prior to reviving/restoring T2 firmware.
* [https://support.apple.com/guide/apple-configurator-mac/revive-or-restore-an-intel-based-mac-apdebea5be51/mac Follow the provided Apple support article for the procedure.]
** Plug the device you are working on to another Mac or MacBook via its master port. The master port on the A2289 is the bottom left side USB-C port (closest to the trackpad).
** Once plugged in, open Apple Configurator 2. You should see a big square icon pop up that says "DFU" or rarely, "RECOVERY".
** Click the icon, Navigate to the top menu bar click "Actions" then "Advanced".
** Select Revive device. You will see a progress bar appear. This process can take over 30 minutes in some cases.
** Be cautious that selecting "Restore" will wipe all user data.
* Possible causes for a device to fail a DFU revive include various hardware issues:
** Short to ground on PP2v5_NAND_SSD_0).
** Absent U9000 voltages. (PP0v9_SSD_0, PPVCCQ_ANI_SSD0 (1.8v).
** Failed Trackpad (Will almost always show the Apple logo before failing the process.)
** Failed NAND.
** Failed T2 or T2 RAM.
** If no secondary causes are found, a DFU Restore may resolve the issue.
 
==== PP3v3_S5 shorted to ground ====
 
* Locate and replace the shorted component. [[How to find short circuits]]
** PP3v3_S5 is a tricky line to inject voltage to on this board, as most components are small 0201 parts.
** Be sure to use a small gauge wire to inject voltage if you choose to inject voltage to a 0201 part. The best place to inject voltage to on this board is pin 5 of U4801.
** 1v at 5 amps is an appropriate voltage to inject into the line. Remove the heatsink prior to injecting voltage as occasionally, the CPU will be the cause of the short to ground. With voltage being injected, perform thermal imaging of the board. If thermal imaging is not available, feel around the board to see where it is getting warm. Once the area is localized, add a small amount of isopropyl alcohol to the area to localize the shorted component.
** Once the shorted component is localized, replace the shorted component.
 
==== U9000 visibly corroded or damaged ====
 
* If corroded, reball the IC. Replacement is usually not necessary.
* If physically damaged or burned, replace the IC. The IC is not programmed and can be taken from any board which utilizes the same part. (338S00410)
 
==== If no short is found on PP3v3_S5, and the device is not in DFU or recovery mode, and all other findings are negative, you can try forcing a firmware revive ====


* Attempt to restore BridgeOs firmware via Apple Configurator 2 by placing the device into DFU mode.
*Generally, when LP610 blows, there will be corresponding pad and trace damage, and jumper wires will usually be required. 36 or 37 AWG enamel-coated copper wire is recommended for jumper wires in this application due to the power requirements of the webcam and ambient light sensor, which are both powered off this filter.
** Solder a wire across SE032 (Omitted/No Stuff) to pull SOC_FORCE_DFU high. Wire should be across pins 3 and 4 or 1 and 2.
* STOP! Before you begin, is your Mac on the LATEST VERSION of MacOs? If not, update your system before proceeding. Forcing a MacBook into DFU mode, and attempting to restore BridgeOs firmware on a old version of MacOs may result in a bricked device. NOTE: Selecting restore will wipe all user data.
* Follow the instructions on this [https://support.apple.com/guide/apple-configurator-mac/revive-or-restore-an-intel-based-mac-apdebea5be51/mac Apple support article] on how to revive or restore T2/BridgeOs firmware, including on how to force a Intel based MacBook into DFU mode by using a key combination.


If the device fails the firmware revive or restore, the T2 chip or one of the NANDs is likely dead or is receiving unstable power from the PMIC (U7800) causing it to crash. If the device fails the firmware revive, you can try empirically replacing U7800. You must removal the large shield covering U7800 and the T2 chip prior, which is not easy. You must use low melt alloy to remove the shield. Be careful not to bridge surrounding components. Go slow and be patient.
# The recommended jumper point for the input side of the LP610 (PP5v_S2) is CP717 or RD930. Ensure you have continuity between PP5v_S2 and LP610.
# Using conformal coating on the jumper wire is strongly recommended.
# Use a 120 Ohm ferrite filter rated for 1.5 amps in a 402 package size only, preferably from a donor board. Do not substitute a resistor, wire, or fuse.
# After LP610 is replaced, and jumper wires are run as needed, replace the display assembly or replace the camera connectors on both the cable side and TCON board side on the display. If any internal layer damage is noted to the TCON board or camera cable, replace the display assembly.


'''Replacing U7800 should be seen as a last ditch effort, as it only works in a small amount of cases, and does not have a definitive diagnostic test to determine if it is bad.'''
'''Only a display for an A2338 MacBook Pro should be used. An older display for an Intel-based MacBook Air will not work and may cause further damage.'''

Latest revision as of 15:29, 29 October 2023

MacBook Pro A2338 camera not detected after history of liquid damage repair
Device MacBook Pro A2338
Affects part(s) Motherboard, Camera, Display assembly
Needs equipment
Difficulty ◉◉◉◌ Hard
Type Soldering, Part replacement


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

Problem description

No camera detected after a history of liquid damage on the 820-02020 logic board.

Symptoms

  • Camera not detected.
  • Possible signs of liquid damage.

Solution

Diagnostic Steps

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

Corroded TCON connector with corresponding short on the display (LP610 will also be blown)

  • Check continuity on LP670.
  1. Place your multimeter in continuity mode and measure across the component. LP610 is a filter, so it is essentially a wire. Your reading should be close to 0.01. You will often find this component visually exploded/burned with adjacent trace damage. Usually, there will also be corrosion on the display camera connector which will require replacement of the connector and sometimes the entire display assembly (left side of the primary display connector). If LP610 measures normally, proceed to the next steps. If LP610 is blown or burned, proceed to the "LP610 blown or visibly burned repair steps" below.

Blown 5v supply filter (LP610)

  • Always inspect the camera connector/cable on the display if this filter is blown.
  • Check camera function with a KNOWN GOOD display.
  1. You don't have a board issue until you know you don't have a parts issue. If LP610 measures normally, test with a known good display and display cable, or place the board in a known good housing. If the camera works normally with a different screen/enclosure, the display is the issue and will need to be replaced. BE SURE TO CHECK LP610 FIRST!

Repair Steps

LP610 blown or visibly burned

Understand that this fault occurred because of a catastrophic short within the TCON board of the display. If you replace LP610 without addressing the display issue, LP610 will fail again.

  • Generally, when LP610 blows, there will be corresponding pad and trace damage, and jumper wires will usually be required. 36 or 37 AWG enamel-coated copper wire is recommended for jumper wires in this application due to the power requirements of the webcam and ambient light sensor, which are both powered off this filter.
  1. The recommended jumper point for the input side of the LP610 (PP5v_S2) is CP717 or RD930. Ensure you have continuity between PP5v_S2 and LP610.
  2. Using conformal coating on the jumper wire is strongly recommended.
  3. Use a 120 Ohm ferrite filter rated for 1.5 amps in a 402 package size only, preferably from a donor board. Do not substitute a resistor, wire, or fuse.
  4. After LP610 is replaced, and jumper wires are run as needed, replace the display assembly or replace the camera connectors on both the cable side and TCON board side on the display. If any internal layer damage is noted to the TCON board or camera cable, replace the display assembly.

Only a display for an A2338 MacBook Pro should be used. An older display for an Intel-based MacBook Air will not work and may cause further damage.