I have a microwave oven – standard cheap LG unit. It's no longer working (it made electrical sparking sounds), so I opened it up to see if it's possible with a DIY repair.
First thing I did was of course to discharge the capacitor for safety reasons.
I cannot see anything obvious here, but I am not experienced in microwave repair at all.
I'm including a video (the most interesting) and a photo.
I have tested the magnetron using the continuity check on a multimeter. It seems to be working. I've checked the big diode and the thermal fuse. Is there anything else I can check?
YouTube Link: Showing how some electric sparking happens near the magnetron
Extra link: A couple more photos if relevant
Best Answer
Conclusion - it's probably wise not to try to fix this. As suggested by comments, it's just going to be too dangerous and not economically feasible. I will scavenge the parts from the old microwave and buy a new one to replace it.