MacBook Pro A2338 Clicking sound from system board, showing 5v on USB-C amp meter repair and MacBook Pro A2338 camera not detected after history of liquid damage repair: Difference between pages

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, Micro-Soldering"Micro-Soldering" is not in the list (Soldering, Teardown, Part replacement, Cleaning, Software, BGA, General) of allowed values for the "Repair Guide type" property., Part replacement

Revision as of 18:09, 18 September 2023

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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.

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.

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.

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.

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.

@@ Line 1: / Line 1: @@
 {{Repair Guide
 |Device=MacBook Pro A2338
-|Affects parts=Motherboard
+|Affects parts=Motherboard, Camera, Display assembly
-|Needs equipment=multimeter, soldering iron, soldering station
+|Type=Soldering, Micro-Soldering, Part replacement
-|Type=Soldering, Micro-Soldering
 |Difficulty=3. Hard
 }}
 {{stub}}
 ==Problem description==
-Clicking sound from the system board with 5V measured by the USB-C amp meter.
+No camera detected after a history of liquid damage on the 820-02020 logic board.
 ==Symptoms==
-*Clicking sound from the system board.
+*Camera not detected.
-*5V reading on the USB-C amp meter.
+*Possible signs of liquid damage.
 ==Solution==
 ===Diagnostic Steps===
-[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]]
+[[File:Placeholder image.jpg|thumb|(Figure 1) -- No image yet. Help expand this page by uploading it!]]
-====Measure voltage on PP3v8_AON====
-Normal voltage = 3.8v. You will likely find that the voltage is low and pulsing slightly or completely absent. This confirms the diagnosis.
-====Perform a visual inspection of the system board====
+====Corroded TCON connector with corresponding short on the display (LP610 will also be blown)====
-This failure is very uncommon without liquid damage. Often times, you will find that one of the 3v8_AON MOSFETs will be corroded, or that U5700 itself will be corroded. If the MOSFETs (Q5800, Q5820, or Q5840) are corroded, proceed to the Repair Steps below for "PP3v8_AON creation MOSFETs corroded" below. If the PP3v8_AON buck converter IC (U5700) is corroded, proceed to the "PP3v8_AON buck converter IC corroded" repair steps below.
+*Check continuity on LP670.
+# 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.
+# 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===
-====PP3v8_AON creation MOSFETs corroded====
+====LP610 blown or visibly burned====
-*Replace Q5800, Q5820, and Q5840 together. It's important to replace all 3 MOSFETs at the same time as if one MOSFET failed, it may have damaged the others. Replacement of U5700 is not necessary as long as it isn't corroded and as long as the clicking sound does not persist after replacement of the MOSFETs.
+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.
-====PP3v8_AON buck converter IC corroded====
+# 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.
-*Replace U5700. Replacement of the PP3v8_AON creation MOSFETs is not required unless they are corroded or if the clicking sound persists after replacement of U5700.
+# 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.
-Verify correct voltage on PP3v8_AON after the relevant repair is performed.
+'''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.'''