MacBook Pro A1708 Not turning on, no current draw at 20V with no shorts repair: Difference between revisions
(Created page with "{{stub}} {{Repair Guide |Device= |Affects parts= |Needs equipment= |Type= |Difficulty= }} ==Problem description== <nowiki>#</nowiki>incomplete thumb|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== ===Diagnostic Steps=== ==== Check for low resistance to ground on SMBUS_SMC_5_G3H_SDA or SMBUS_SMC_5_G3H_SCL =...") |
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{{Repair Guide | {{Repair Guide | ||
|Device= | |Device=MacBook Pro A1708 | ||
|Affects parts= | |Affects parts=Motherboard | ||
|Needs equipment= | |Needs equipment=multimeter, soldering iron, soldering station | ||
|Type= | |Type=Soldering, Micro-Soldering | ||
|Difficulty= | |Difficulty=3. Hard | ||
}} | }} | ||
{{stub}} | |||
==Problem description== | ==Problem description== | ||
<nowiki>#</nowiki>incomplete | <nowiki>#</nowiki>incomplete |
Revision as of 09:09, 27 October 2023
MacBook Pro A1708 Not turning on, no current draw at 20V with no shorts repair | |
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Device | MacBook Pro A1708 |
Affects part(s) | Motherboard |
Needs equipment | multimeter, soldering iron, soldering station |
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. |
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Problem description
#incomplete
Symptoms
- Not turning on
- 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
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!