Another: magnetron filament and shell short-circuit, can be repaired in this way:
1. First of all, with a small screwdriver, the back cover carefully pry open.
2. Use a small rotary head to knock out the original rivets.
3. Cut the copper wire above the pins (cut the root flush).
4. Install the new seat and tighten it with the 4 screws provided.
5. Thread the broken copper wire into the eye of the holder and clamp it with pliers. Solder it with a soldering iron.
6. Put on the back cover.