good that you found out. I have been very careful since I experienced burned smell myself a few occasion. I am a small miner so able to do smell test each day. The large miners probably have better solution. In my case it was electrical adapter and riser in separate occasions.
While the system is running, pay attention to the Gpu fans and check the connection sockets of the cables with your hand. It's usually cold. If heat has started in the cable socket, this will also cause problems. From the heat rate, you can notice this socket before it melts and solve it without problems. When the socket melts and the cables are damaged, you need to try a little harder. When the smell begins to come, the socket heats up and melts so much that it can no longer be saved.