How to replace the light bar of ceiling lamp

If the ceiling lamp has a lampshade, it is necessary to remove the cover first, then measure the positive and negative poles of the wiring with a multimeter, remember the position of the zero line, then remove the lamp board and the original faulty lamp strip, install a new lamp strip, connect the wires and install the lampshade. The method of replacing the light bar is as follows: remove the cover of the ceiling lamp, usually a plastic cover. If it is a rotating lampshade, it can be rotated clockwise. If it is a long lampshade, you can find the switch on one side and press the switch to open the lampshade. If there is no cover, go straight to the next step. At the same time, prepare multimeter, Phillips screwdriver and other tools. When you see the tube or bulb in the ceiling lamp, remember the different colors of the connected wires, the positions of the positive and negative poles, and the positions of the zero line and the live line, which can be photographed with the mobile phone for later installation. Turn and unscrew a few screws at the edge of the metal plate with a screwdriver and set them aside. Then carefully remove the metal plate. If there are wires, you need to remove them one by one. Take off the lamp pole or bulb, and different lamp types can be obtained in different ways. Small bulbs are generally spiral lampholders, which can be removed by rotating them. If it is a square light bar, there are buttons on both sides. Just remove the buckle and install a new light bar.