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Either the live wire is broken or the neutral line is broken. One joint at a time to check the breakpoint.
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Generally, the joint connection is loose.
In this case, you can mainly put this main circuit in place, and then send another one, and then connect the lights on these circuits one by one.
Is it faint or flashing.
If it is slightly bright, it is the problem of the switch fire line and neutral line, and it will be solved by replacing it. >>>More
Circuit board wiring issues. Directly change the whole row, if you are not reluctant, you will measure the universal meter one by one.
Usually because:
1. The power supply inlet voltage is low. >>>More
It s clearly a core pull.This is also known as disconnection.It s too simple.You can find out where the break is