The normal up converter has abnormal corners, and now it is normal.
There is a small capacitor in the upconverter, which is broken. When the two corners of the upper frequency converter are blocked, the capacitor is broken, so the capacitor can be cut off in an emergency.
How to turn the lamp to a certain angle and light it after installing the upconverter?
At this time, one of the four legs of the lamp tube is not in contact with the lamp cap (disconnected), which is the same as removing the upconverter.