More actions
| MacBook Pro A1989 Charger not turning on USB-C meter repair | |
|---|---|
| Device | MacBook Pro A1989 |
| Affects part(s) | Motherboard |
| Needs equipment | multimeter, soldering iron, soldering station, thermal camera |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
This article is a stub. You can help Repair Wiki grow by expanding it
Problem description
When charging the A1989 MacBook with a USB-C charger and measuring the input current and voltage with a USB-C meter, the meter does not even turn on at all or 0 current.
Symptoms
- MacBook not turning on.
- All voltages missing.
- Not charging.
Solution
Diagnostic Steps
Check PP20V_USBC and PPDCIN_G3H resistance
- Measure the resistance between PP20V_USBC and GND with a multimeter on resistance mode
- if you read less than 50 ohms, you have a short, proceed to "Short on PP20V_USBC or PPDCIN_G3H" repair steps below
- Measure the resistance between PPDCIN_G3H and GND with a multimeter on resistance mode
- if you read less than 50 ohms, you have a short, proceed to "Short on PP20V_USBC or PPDCIN_G3H" repair steps below
Faulty USB-C port
If both rails above are not shorted, it is highly likely that the USB-C port itself is shorted or damaged inside.
Repair Steps
Short on PP20V_USBC or PPDCIN_G3H
- Inject 1V to the shorted rail using a Lab Bench Power Supply.
- With a thermal camera, identify the source of the short, most likely it is a capacitor
- Replace the shorted component.
Shorted USB-C port
Replace the offending port.