HT-AX7 speaker doesn't charge

To ensure that the HT-AX7 charges properly, you need to use a USB PD (Power Delivery) AC adapter that has a minimum capacity of 45 W. If you use any other commercially available AC adapter (such as a cell phone adapter), it will not provide the power required, and you may experience the following issues:

• No power
• The main unit may not charge
• The speakers may not charge
• You may face Bluetooth® connection issues, such as connection or pairing failures
• The Sony | Home Entertainment Connect app may not detect or recognize the HT-AX7.

Check the following

• Use the supplied USB Power Delivery AC adapter [B] and USB Type-C cable [A] to charge the main unit and speakers.
  
  Note: If the supplied USB PD AC adapter is lost or misplaced, replacements are available for purchase.  Go to Parts and Accessories. 
  
  
• Make sure that the USB Type-C cable is firmly connected to the DC IN port on the front speaker.

For details about how to charge the speaker and about notes on charging, refer to the following Help Guide or articles:

• Charging the Speaker System (HT-AX7 Help Guide)
• Can I use the iPhone® or iPad® USB AC adapter to charge the HT-AX7 speaker?
• Unable to charge the speaker system when using a commercial USB AC adapter.