Power-on Failure.

Analysis
1,The power cord may be disconnected or not securely connected to the outlet.
2,The fuse in the power cord is damaged.
3,DC power supply voltage is not within the operating voltage of the repeater.

Solution
1,Properly connect the power cord and ensure secure connection.
2,Check whether the DC power fuse is damaged. If it is damaged, replace it with a new one.
3,Check whether the DC power supply voltage is within the operating voltage of the repeater (13.6V±15%). If not, adjust it to proper range.