Chevrolet
Standby Power Supply Noise
Charger makes a high-pitched whining noise even when not actively charging.
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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
Aging capacitors in standby power supply, Coil whine from small transformer or inductor, Loose PCB mounting, Operation at edge of design voltage
How to Fix / Troubleshooting
Safety first: Noise alone is not dangerous, but any accompanying heat or smell is a concern.
- Step 1 – Confirm source: Place your ear near (but not touching) the charger to confirm the noise originates from it and not another device.
- Step 2 – Check mounting: Ensure the charger is firmly mounted; loose mounting can amplify coil whine.
- Step 3 – Monitor over time: If the noise is faint and there are no functional issues, it may be normal. If it grows louder or is accompanied by faults, schedule service.
- Step 4 – Service power supply: A technician can inspect and, if necessary, replace the main PCB or power supply components.
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Repair Difficulty
Medium
3/5
Required Part
Low-Voltage Power Supply Section of Main Control PCB
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