MacBook Pro A2338 camera not detected after history of liquid damage repair and MacBook Pro A1707 Not turning on, no shorts repair: Difference between pages

MacBook Pro A1707 Not turning on, no shorts repair
Device	MacBook Pro A1707
Affects part(s)	Motherboard
Needs equipment	multimeter, soldering iron, soldering station
Difficulty
Type	Soldering

Latest revision as of 15:33, 29 October 2023

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Problem description

#incomplete

Provide a concise description of the issue here. Be as specific as possible to help readers quickly determine whether or not this is the exact problem they are facing.

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

Symptoms

Not turning on
Drawing 0A (no current) on 20V as measured by USB-C meter

Solution

Check for low resistance to ground on SMBUS_SMC_5_G3H_SDA or SMBUS_SMC_5_G3H_SCL

On older MacBooks, this would result in no battery recognition and a lower voltage on PPBUS_G3H—on USB-C models, it actually results in the machine not turning on at all. Can be caused by a tiny speck of conductive material in the battery connector.

Check for 0.4 V in diode mode on SMBUS_SMC_5_G3H_SDA and SMBUS_SMC_5_G3H_SCL (red probe on GND)

if it's higher the I²C signals will look funny, not going just between 0 and 3.3 V. Check D6950—it can be blown when the SMC goes.

Check voltage on PPBUS_G3H

If you have no or low voltage on this rail, check the repair steps below.

Repair Steps

low resistance to ground on SMBUS_SMC_5_G3H_SDA or SMBUS_SMC_5_G3H_SCL

Clean the conductive material, Video

0.4 V in diode mode on SMBUS_SMC_5_G3H_SDA and SMBUS_SMC_5_G3H_SCL (red probe on GND)

#incomplete

Low or no voltage on PPBUS_G3H

It could be bad/dead ISL9239. Also check for ≈2.4 Ω on the two ISL9239 current-sensing circuits. If any of the 1 Ω or current-sensing resistors are blown, replace them first, or you will re-kill any new ISL9239 you try!

@@ Line 1: / Line 1: @@
 {{Repair Guide
-|Device=MacBook Pro A2338
+|Device=MacBook Pro A1707
-|Affects parts=Motherboard, Camera, Display assembly
+|Affects parts=Motherboard
-|Type=Soldering, Part replacement
+|Needs equipment=multimeter, soldering iron, soldering station
-|Difficulty=3. Hard
+|Type=Soldering
 }}
 {{stub}}
 ==Problem description==
-No camera detected after a history of liquid damage on the 820-02020 logic board.
+<nowiki>#</nowiki>incomplete
+Provide a concise description of the issue here. Be  as specific as possible to help readers quickly determine whether or not this is the exact problem they are facing.
+[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]]
 ==Symptoms==
-*Camera not detected.
+*Not turning on
-*Possible signs of liquid damage.
+*Drawing 0A (no current) on 20V as measured by USB-C meter
 ==Solution==
-===Diagnostic Steps===
+====Check for low resistance to ground on SMBUS_SMC_5_G3H_SDA or SMBUS_SMC_5_G3H_SCL====
-[[File:Placeholder image.jpg|thumb|(Figure 1) -- No image yet. Help expand this page by uploading it!]]
+On older MacBooks, this would result in no battery recognition and a lower voltage on PPBUS_G3H—on USB-C models, it actually results in the machine not turning on at all. Can be caused by a tiny speck of conductive material in the battery connector.
+====Check for 0.4 V in diode mode on SMBUS_SMC_5_G3H_SDA and SMBUS_SMC_5_G3H_SCL (red probe on GND)====
-====Corroded TCON connector with corresponding short on the display (LP610 will also be blown)====
+if it's higher the I<sup>2</sup>C signals will look funny, not going just between 0 and 3.3 V. Check D6950—it can be blown when the SMC goes.
-*Check continuity on LP670.
+====Check voltage on PPBUS_G3H====
+If you have no or low voltage on this rail, check the repair steps below.
-# 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===
+====low resistance to ground on SMBUS_SMC_5_G3H_SDA or SMBUS_SMC_5_G3H_SCL====
-====LP610 blown or visibly burned====
+Clean the conductive material, [https://www.youtube.com/watch?v=PDKlWu1eDFA&t=254s Video]
-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.
+====0.4 V in diode mode on SMBUS_SMC_5_G3H_SDA and SMBUS_SMC_5_G3H_SCL (red probe on GND)====
+<nowiki>#</nowiki>incomplete
-*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.
+====Low or no voltage on PPBUS_G3H====
+It could be bad/dead ISL9239. Also check for ≈2.4 Ω on the two ISL9239 current-sensing circuits. If any of the 1 Ω or current-sensing resistors are blown, replace them first, or you will re-kill any new ISL9239 you try!
-# 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.'''