Audi HMI Power / Backlight Instability

Audi wallbox front LEDs or display are very dim or flicker during operation.

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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

Weak 5 V/3.3 V supply to HMI board, Failing LED driver on display board, Loose ribbon cable, Overheating of front panel electronics

How to Fix / Troubleshooting

Safety first: Turn off power before removing the front cover.

  • Check ambient temperature: Ensure the charger is not exposed to direct sunlight or high heat that could affect the display.
  • Reseat connectors: With power off, reseat the ribbon cable between the main board and the HMI/display board.
  • Measure HMI voltage: A technician can verify that the correct low-voltage supply is present at the display board. If low or unstable, the main board regulator may be failing.
  • Replace display board: If supply is stable but LEDs remain dim or flicker, replace the front display/LED board.

While dim LEDs may not affect charging, they hinder status visibility and should be corrected.

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Repair Difficulty

Medium 3/5

Required Part

Front Display / LED Board
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