Is not a transistor. Is either a resistor or capacitor. Look at the same part on a good board and you will see a very tiny component number on the PCB next to the part, something like R123 or C123. If 'R' then is a resistor, if 'C' then is a capacitor. Then look at the good component itself and you should see a tiny number on it identifying the actual mfg part number. Search for the number on Google using "resistor (or capacitor) <number>" to find a supplier for it.
Just disconnect the ribbon cable and power from bad board and miner will run just fine with just 2 and even 1 hash board.
Honestly, the color of the part is brown or orange so it is not a resistor if you can check the hashboard circuit diagram it should be a C123.
Resistor color is black, you can check the image below as a sample of resistor and capacitor.
According to OP's image, I don't see any name under the capacitor unless if you have hashboard schematic diagram?
@OP I think if you don't have scrap hashboard you can try to find capacitor in other devices like mobile phones just make sure its the same color and size and you must have a multitester to check if the board is shorted or not after you change the capacitor just to make sure no other components can be damaged due to shorted capacitor.