Hisense
Power Supply Coil Whine
Unit emits a high-pitched whining noise even when idle or powered off (but plugged in).
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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
Vibrating transformer or inductor on main PCB, Aging capacitors, Poorly secured power components
How to Fix / Troubleshooting
Safety first: Unplug the unit before opening. Noise originates from live components.
- Confirm source: Plug in and listen carefully to locate the noise area (without opening). Then unplug.
- Inspect PCB: Open the unit and identify transformers or inductors in the power section. Check for loose mounting or cracked glue.
- Secure components: If you are experienced, you can apply high-temperature-safe silicone or epoxy to secure vibrating coils (with power disconnected and components cool).
- Replace PCB if needed: If noise is loud or accompanied by instability, replace the main control PCB.
- Alternative: If the noise is minor, unplug the unit when not in use to eliminate the sound.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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