J+ Booster User Interface Lockup / Firmware Hang

Charger display is frozen on one screen and does not respond to button presses, though charging may continue.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Firmware bug in UI module, Electrical noise causing microcontroller lockup, Faulty touch/button interface on display PCB, Overheating of control electronics

How to Fix / Troubleshooting

Safety: If charging is active, stop the session at the vehicle before disconnecting power.

  • Stop charging: End the session via the vehicle, then unplug the charger from mains.
  • Hard reset: Leave the unit disconnected for at least 5 minutes, then reconnect.
  • Update firmware: If supported, update the J+ Booster firmware to the latest version following manufacturer instructions.
  • If lockups recur frequently: The display/control PCB or main control board may be defective and should be replaced.
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Repair Difficulty

Medium 3/5

Required Part

J+ Booster Display / Control PCB
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