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| MacBook Pro A1707 Charger stuck at 5V instead of 20V repair | |
|---|---|
| Device | MacBook Pro A1707 |
| 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 to no 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
- Corroded LDO cap for PP3V3_G3H around a CD3215. On right side of board, check under shielding by SSD under the right CD3215 for hidden corroded cap. Example video: (drawing 200 mA, 1 V on PP3V3_G3H, not possible to measure short to ground on PP3V3_UPC_LDO because it is only bringing PP3V3_G3H down when machine is turned on)
- PP3V3_G3H missing due to PM_EN_P3V3_G3H missing due to bad ISL9239
- CD 3215 chip does not receive a signal to request 20 V from the charger. Issue should be traced back along the line to identify culprit, which is often ISL 9239.
- Bad CD3215
- A bad CD3215 will not boot loop, whereas the good CD3215 WILL boot loop. It takes up to 10 seconds for it loop, so be patient.
- Check voltage at C7080. If it reads ~1.4v, it's most likely a CD3215.
- Bad CD3215 ROM chip (U2890)
- CD3215 had corrosion nearby, fixed by cleaning up the area and reflowing Example video: (corroded capacitor next to CD3215, fixed by reflow of CD3215 and replaced capacitor)
- CD3215 liquid damaged. Attempt to reflow affected chip(s) first. Replace the chip(s) if reflowing does not resolve the issue.
- 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