Customer Questions and Answers for Time Delay Fuse by Lg

Hello Kenny, It sounds like there is probably a board issue with the microwave. I'm sorry but we will need to ask you to please post a new question including the verified model number from the units' I.D. tag since it will not come up for us as a valid model number. Thank you for your patience and understanding in this matter.

Brad, You will want to check the thermal cutoffs in the unit which could cause the issue that you are having. If the thermal cutoffs do not have continuity then you would want to replace the part.

Hello J. Check wiring on the switches. Also, make sure the door strike is working properly.

Tony, The most likely cause to blow the fuse when plugged in would be a wire that is damaged or a issue with the door switches being defective. The door switch could test good for continuity but still have a issue where it is causing the fuse to blow.

Hello Ray, You should be able to access the fuse by removing the air grille and the control panel. The fuse 3B74133Q should be accessible through the control opening without pulling the unit from its' installed position.

Hello Mike. WPM0805101 is the fuse needed.

Terry, The fuse for your unit would be located on the noise filter. This is located behind the control panel of the unit and you can pull the fuse out and put a new one in. To access this fuse you will need to remove the air grill on the unit. Once you remove the air grill there should be a screw that holds the control panel in place.

Hello Ken. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.

Hello Alma. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.

Ray, With everything working except for the heat, the issue would be in either the capacitor, diode, transformer or a bad magnetron. Test each component and if it is faulty then it would need to be replaced.