After the transformation, wallpaper was pasted and socket switch lights were installed, and the main line was out of power. Master said he forgot how to thread. What should I do?

In the main switch box, first switch the circuit breakers one by one and check which circuit breaker you don't have electricity to belong to.

After finding it, open the circuit breaker and check whether there is electricity at the upper and lower terminals of the circuit breaker. If there is electricity at the upper terminal and there is no electricity at the lower terminal, it means that the circuit breaker is faulty. Replace the circuit breaker.

If there are both above and below, the middle of the line is broken. You can use a multimeter to check which one is broken. If only one is broken, then the other two are used as fire zero lines, and the broken ones are not used as ground lines. There is no ground wire in the socket, and ordinary appliances will do.

If two or both are broken, see if you can pull them out. If you can't pull it out, you'll have to cut the wall and rearrange it.