Sony WH-1000XM3 Headphones Charging but Not Turning On Repair

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Sony WH-1000XM3 Headphones Charging but Not Turning On Repair
Device WH-1000XM3
Affects part(s) Main board
Needs equipment screwdrivers, pry tool, soldering equipment
Difficulty ◉◉◉◌ Hard
Type Soldering


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Problem description

How to fix Sony WH-1000XM3 headphones that will not turn on.

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Symptoms

  • Will not power on but appears to charge (red charging light comes on and stays lit).

Solution

  • Use a multimeter to check the battery. Battery should read between 3.7v and 4.2v. If it's outside of this range, replace battery with another one.
  • Check connections, check unit for signs of water damage.
  • Assuming all the above stuff is good, you have a dead L_MAIN board, replace L_MAIN board. The service manual says you can't but you can. Just make sure you solder all wires in the correct order.
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