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Charging detected but very slow + distorted speakers + one-sided audio

I recently worked on an iPad Pro 11" 3rd generation and replaced several parts:

  • Chassis (housing)
  • Display
  • All 4 speakers
  • USB-C charging port

After reassembly, I’m now facing multiple issues:

  • Charging is detected but extremely slow (battery percentage barely increases)
  • All speakers are heavily distorted (on all corners)
  • USB-C audio only works on one side (only one earbud)

The USB-C port is brand new and properly installed.

I double-checked all connections and flex cables, nothing seems out of place.

Has anyone already encountered this kind of issue after a repair like this?

What could be causing it?

I was thinking about something related to power management (PMIC / charging IC or maybe a damaged power line), but I’d like to hear if others have seen similar symptoms.

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