MacBook Pro A1708 Charger not turning on USB-C meter repair

MacBook Pro A1708 Charger not turning on USB-C meter repair
Device	MacBook Pro A1708
Affects part(s)	Motherboard
Needs equipment	multimeter, soldering iron, soldering station, thermal camera
Difficulty	◉◉◉◌ Hard
Type	Soldering

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Problem description

When charging the A1708 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.

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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

How to find short circuits

• 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.
• D3400 / D3300 are possible culprits

Shorted USB-C port

Replace the offending port.

Example video