When we connect the line meter to the poe switch that is working, the 12 volt DC power supply output by the poe switch through the network cable will burn the motherboard of the line meter. The line meter works under 9 volts under normal conditions, but when the working voltage of 12 volts is added, the main board of the line meter is damaged. It will cause its motherboard to burn under overpressure conditions, which can not be repaired
The line gauge is burned and we can fix it if we can find the same chip inside.