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1. There is a problem with the quality of all plates, and the corners need to be re-reinforced. The gusset needs to be replaced.
Plasterboard joint cracks are a problem for painters, and anti-crack tape should be used after the putty is batched, and then the application should be carried out. >>>More
1.Gypsum itself has quality defects.
2.The keel density is not enough. >>>More
1. Power off.
2. Disconnect the power cord of the ballast, that is, the two white wires of the ballast without a protective cover. >>>More
Snap it up directly from the edge and take the whole light off and you're good to go.
Maybe you go to your local community forum and post an inquiry, maybe you can get a better answer. At least a repairman outside of your city's borough won't be able to fix it for you.