MacBook Pro A1990 Not turning on, short on PPBUS G3H repair: Difference between revisions
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(Created page with "{{stub}} {{Repair Guide |Device= |Affects parts= |Needs equipment= |Type= |Difficulty= }} ==Problem description== Repair of a common short on PPBUS_G3H on an A1990 MacBook Prothumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it! ==Symptoms== *MacBook not turning on. *Less than 10 Ohms on PPBUS_G3H as measured with a multimeter (short) *Very low current draw from the charging port at 5V ==Solution== === Sh...") |
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{{Repair Guide | {{Repair Guide | ||
|Device= | |Device=MacBook Pro A1990 | ||
|Affects parts= | |Affects parts=Motherboard | ||
|Needs equipment= | |Needs equipment=multimeter, soldering iron, soldering station, thermal camera | ||
|Type= | |Type=Soldering, Micro-Soldering | ||
|Difficulty= | |Difficulty=3. Hard | ||
}} | }} | ||
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==Problem description== | ==Problem description== | ||
Repair of a common short on PPBUS_G3H on an A1990 MacBook Pro[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]] | Repair of a common short on PPBUS_G3H on an A1990 MacBook Pro[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]] |
Revision as of 19:18, 7 October 2023
MacBook Pro A1990 Not turning on, short on PPBUS G3H repair | |
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Device | MacBook Pro A1990 |
Affects part(s) | Motherboard |
Needs equipment | multimeter, soldering iron, soldering station, thermal camera |
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
Repair of a common short on PPBUS_G3H on an A1990 MacBook Pro
Symptoms
- MacBook not turning on.
- Less than 10 Ohms on PPBUS_G3H as measured with a multimeter (short)
- Very low current draw from the charging port at 5V
Solution
Short on PPBUS_G3H
Inject 1V (increase if no reaction), watch for hot spots with thermal cam. Usually it's a bad tantalum cap
Measure PPBUS_G3H to vCORE coils (coils around CPU/GPU) IF those measure UNDER 1Ohm (0.3-0.8) then you most likely have a direct 12V short to CPU/GPU. On this board this situation is always a no fix.