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Power Supply Instability to Control Board
Microwave clock resets to 0:00 or flashes after every use or when opening the door; unit otherwise works.
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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
Loose mains connection,Faulty internal power supply capacitor,Intermittent thermal fuse or connector,Defective control PCB
How to Fix / Troubleshooting
Safety first: Unplug the microwave before internal inspection.
User-level checks:
- 1. Check plug fit: Ensure the plug fits tightly in the outlet and that the outlet is not loose.
- 2. Avoid shared circuits: Do not share the outlet with heavy appliances that may cause voltage dips.
Technician-level checks:
- Inspect the control board for swollen electrolytic capacitors in the low-voltage supply.
- Check connectors and thermal fuses for intermittent contact.
- Replace the control PCB if the power supply section is unstable.
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Repair Difficulty
Hard
4/5
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