MacBook Pro A1706 Not turning on, PPBUS G3H short 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 A1706 MacBook Pro thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it! ==Symptoms== * sub 20 ohms on PPBUS_G3H * Not turning on ==Solution== Inject 1 V (increase if no reaction), watch for hot spots with thermal camera. Usually it's a bad tantalum ca...") |
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{{Repair Guide | {{Repair Guide | ||
|Device= | |Device=MacBook Pro A1706 | ||
|Affects parts= | |Affects parts=Motherboard | ||
|Needs equipment= | |Needs equipment=multimeter, soldering iron, soldering station, thermal camera | ||
|Type= | |Type=Soldering | ||
|Difficulty= | |Difficulty=3. Hard | ||
}} | }} | ||
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==Problem description== | ==Problem description== | ||
Repair of a common short on PPBUS_G3H on an A1706 MacBook Pro | Repair of a common short on PPBUS_G3H on an A1706 MacBook Pro |
Latest revision as of 18:52, 30 October 2023
MacBook Pro A1706 Not turning on, PPBUS G3H short repair | |
---|---|
Device | MacBook Pro A1706 |
Affects part(s) | Motherboard |
Needs equipment | multimeter, soldering iron, soldering station, thermal camera |
Difficulty | ◉◉◉◌ Hard |
Type | Soldering |
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Problem description
Repair of a common short on PPBUS_G3H on an A1706 MacBook Pro
Symptoms
- sub 20 ohms on PPBUS_G3H
- Not turning on
Solution
Inject 1 V (increase if no reaction), watch for hot spots with thermal camera. Usually it's a bad tantalum capacitor. Measure PPBUS_G3H to Vcore coils (coils around CPU/GPU). If those measure under 1 Ω (0.3–0.8Ω) then you most likely have a direct 12 V short to CPU/GPU. On this board this situation is always a no-fix.
Example video: No Power — A1706 2016 4xTBT3 TB 13" MacBook Pro 820-00239
- 0 V — PPBUS_G3HOT
- Inject 1 V into PPBUS_G3HOT rail.
- U7600 Dual MOSFET gets hot. Part number CSD58879Q3D.
- Visual inspection of shorted component shows solder ball popping out the side of component. C7601 is also damaged.
- Removed C7601, short still persists.
- Removed U7600, short gone.
- As of April 29, 2018 no donors available. Board not fixed.