Raspberry Pi PWR LED illuminates, but doesn't turn on or faint buzzing when connected to power Repair

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Raspberry Pi PWR LED illuminates, but doesn't turn on or faint buzzing when connected to power Repair
Device Raspberry Pi
Affects part(s) Main Logic Board
Needs equipment multimeter, soldering iron, soldering station
Difficulty ◉◉◉◌ Hard
Type Soldering


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Problem description

PWR LED illuminates but doesn't turn on or faint buzzing when connected to power supply. Missing voltages at a GPIO pin.

  • Pi 3 (A+ and B+)
  • Pi 4 (all)
Example image (Figure 1) -- No image yet. Help expand this page by uploading it!

Symptoms

  • The red PWR LED illuminates, but the system doesn't turn on.
  • There is a faint buzzing sound when power is supplied to the PCB.
  • 5V present at GPIO 2, but no 3.3V on GPIO 1.

Solution

See Raspberry Pi MXL7704

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