How to Troubleshoot & Replace Lg AP4457332 / 6324W1A001L Magnetron

I installed the Magnetron that you sent with no problems and now the microwave works like new. 

I removed the external cover using a small flat blade screwdriver as I didn't have a tool for the security torx screws. I discharged the capacitor. After reading online the most probably cause of my problem was the Magnetron. I tested the unit with an ohm meter by checking between the leads and also to ground. While the Magnetron tested good with this method I decided to replace it anyway (shot in the dark). A new part came from AppliancePartsPro within 2 days (they are awesome) and after putting in the new part, viola, microwave was working again. 

Replaced a burned out Magnetron. 

I researched on the Internet about possible problems and fixes and took my microwave apart and found that the magnetron was busted. Found your website and it had the part and confirmed the compatability with my model so ordered it. Came in and I installed the magnetron and the rest is history. A $60 fix saved me buying and installing what would have cost over $200. 

First replaced the diode which was bad. Then tackled the magnetron. 

Replaced the Magnetron and checked all connections. 

REMEMBER TO ALWAYS UNPLUG AND SAFELY DISCHARGE THE CAPACITOR WHEN OPENING UP A MICROWAVE I first had to open the microwave and run all the individual component troubleshooting tests listed in the repair manual (which required a multi-meter). Everything tested good, except I did not want to run the test which required measuring the voltage from the main board while it was running since it did not seem safe to me. However, I checked that the humming noise switched on and off when I ran the microwave at less than 100% power, which I believe checked a similar thing. Because this suggested that the control board was good, the manual suggested that I replace the magnetron in this case. Accessing the four screws on the magnetron was a bit annoying, because it required taking the whole plastic venting apparatus off on top of the microwave, but once I did that everything went smoothly and the food started heating again. 

I replaced the magnetron in my LG Above stove microwave. 

The microwave "ran" fine but did not warm food. Suggested fixes were magnetron and/or door switches. Since I had to open the unit, I opted to replace the magnetron and all switches at the same time. All in it was about $85. All in all, it went very smoothly. I suggest a team lift to get the unit down and keep track of your screws! Unplug microwave. Remove the screws (2) for the control panel. Lift the panel straight up and then carefully tip the top out. Remove all the screws to remove the top/side panel. The quantity below is based on memory. Apologies for any inaccuracies. ~3 screws for the top vent ~5 screws on top of the panel ~6 screws on the bottom (3 per side) ~10 screws on the back (3 per side, 4 on top) Once the panel is loose, slide the panel back as you rotate the back bottom corner up and out. Discharge the capacitor. Holding an insulated pair of needle nose pliers, touch one jaw to the positive and one jaw to the negative terminal. Repeat a couple of times to make sure fully discharged. Unplug the magnetron and remove the mounting screws (4). Mount new magnetron and plug-in connector. Unscrew the top and bottom mounting screws for the door switch bracket. Slide the bracket straight up and pull out. Replace door switches. The top and bottom are the same model switch, the middle is different. Remount door switch bracket. Replace top/side microwave panel and screws. Replace control panel. Remount microwave. Drink beer. 

Replaced the magnetron.