The smell of paste is mostly due to the long startup time, which causes serious local heating of the circuit board, which leads to the melting of solder joints, thus making the circuit contact poor and the heating more serious. The circuit board and its related components are in a state of imminent combustion!
It should be turned off immediately, and the early damage is light, and ordinary maintenance personnel can handle it!
As for what the problem is, it needs to be checked to know, mostly power supply and circuit!