Daewoo
No Power – Primary Power Circuit Failure
Microwave completely dead – no display, no light, no response
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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
Blown internal line fuse, Open thermal fuse on cavity or magnetron, Faulty power cord, Failed line filter board
How to Fix / Troubleshooting
Safety first: Unplug the microwave before any inspection. Even when dead, internal components can be hazardous.
Step-by-step checks:
- 1. Verify outlet: Test the wall outlet with another appliance or a tester. Reset any tripped breaker or GFCI.
- 2. Inspect power cord: Look for cuts, burns, or crushed sections. If damaged, the cord must be replaced by a qualified technician.
- 3. Access internal fuse (for experienced users): Remove the outer cabinet. Locate the main line fuse near the power cord entry or line filter board. Visually inspect and test with a multimeter. If blown, investigate the cause (short, surge) before replacing with the exact same rating.
- 4. Check thermal fuses: Locate thermal fuses on the cavity and magnetron. Test for continuity. Replace any open thermal fuse with the correct Daewoo part.
Warning: A repeatedly blowing fuse indicates a deeper fault (e.g., shorted HV component) and requires professional diagnosis.
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Repair Difficulty
Hard
4/5
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