MacBook Pro A1708 Charger stuck at 5V instead of 20V repair: Difference between revisions
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{{Repair Guide | {{Repair Guide | ||
|Device=MacBook Pro A1708 | |Device=MacBook Pro A1708 | ||
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For more information about this problem, check [[Charger stuck at 5V instead of 20V on MacBooks]] | For more information about this problem, check [[Charger stuck at 5V instead of 20V on MacBooks]] | ||
[[File: | [[File:Screen Shot 2024-03-20 at 4.10.10 PM.png|thumb|Location of C6465 capacitor on the board view (Figure 1)]] | ||
==Symptoms== | ==Symptoms== | ||
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* If 5 V and 0.00 A draw, most likely a 0–1 Ω short to ground on PP3V3_G3H | * If 5 V and 0.00 A draw, most likely a 0–1 Ω short to ground on PP3V3_G3H | ||
* PP3V3_G3H missing due to a short circuit on the input to PP3V3_G3H creation circuit | * PP3V3_G3H missing due to a short circuit on the input to PP3V3_G3H creation circuit | ||
* Check for short on PP3V3_G3H with multimeter in diode mode. A good place to check is C6465. If short, inject 3v at 1a to find the short. | * Check for short on PP3V3_G3H with multimeter in diode mode. A good place to check is C6465. If short, inject 3v at 1a to find the short. If a short is found and repaired, ISL 9239 may also be bad due to the short. | ||
[https://www.youtube.com/watch?v=gBAZCUShuU4 Example video] (board taking 35 mA, 160 Ω short on PPVIN_G3H_P3V3G3H (input PP3V3_G3H creation circuit), fixed by replacing 3 capacitors and 1 diode) | [https://www.youtube.com/watch?v=gBAZCUShuU4 Example video] (board taking 35 mA, 160 Ω short on PPVIN_G3H_P3V3G3H (input PP3V3_G3H creation circuit), fixed by replacing 3 capacitors and 1 diode) |
Latest revision as of 09:35, 21 March 2024
MacBook Pro A1708 Charger stuck at 5V instead of 20V repair | |
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Device | MacBook Pro A1708 |
Affects part(s) | Motherboard |
Needs equipment | multimeter, soldering iron, soldering station, thermal camera |
Difficulty | ◉◉◉◌ Hard |
Type | Soldering |
Problem description
Charging voltage from USB-C charger is stuck at 5V instead of 20V.
For more information about this problem, check Charger stuck at 5V instead of 20V on MacBooks
Symptoms
- Not charging
- Most likely not turning on
- Drawing very little current
Solution
- If 5 V and 0.00 A draw, most likely a 0–1 Ω short to ground on PP3V3_G3H
- PP3V3_G3H missing due to a short circuit on the input to PP3V3_G3H creation circuit
- Check for short on PP3V3_G3H with multimeter in diode mode. A good place to check is C6465. If short, inject 3v at 1a to find the short. If a short is found and repaired, ISL 9239 may also be bad due to the short.
Example video (board taking 35 mA, 160 Ω short on PPVIN_G3H_P3V3G3H (input PP3V3_G3H creation circuit), fixed by replacing 3 capacitors and 1 diode)
- 5 V varying slightly around 0.05 A, repaired by reflowing with hot air and flux U2800 (TBT ALPINE RIDGE chip) and components around through the aluminium enclosure
- Corroded LDO capacitor for PP3V3_G3H around a CD3215
- PP3V3_G3H missing due to PM_EN_P3V3_G3H missing due to bad ISL9239
Example video (device not turning on, charger taking 0 mA)
- Bad CD3215
- Bad CD3215 ROM chip (U2890)
- Bad solder of R3000 or R3001 resistor (not passing PP3V3_G3H through to one of the CD3215s)
- Bad / dead ISL9239 — it needs to make the enable for the 3.3 V regulator (U6990), PM_EN_P3V3_G3H
- Bad / dead SMC — it needs to talk to the CD3215s to tell them to go to 20 V
- Bad pi3usb32 (USB switch, not present on boardview, located next to usb ports)
Example video (PP3V3_G3H 0.3 V, resistance to ground measured as 380 kΩ, active short caused by pi3usb32, found by using thermal camera)