Seen there are still people having issues with the strongu bins..

I guess one of the most common failures ist the freq stopping at 170 and no hashing at all.

1.) Dismantle the whole creature and gently check if the tiny capacitors on the hashboard are still properly soldered onto the board. (470 yF/ 16V)
If not replace them with equal ones with wirelegs. It's a pain to preheat and solder the original ones with the shortlegs..

2.) Fire up the bin, wait 10 min. Get the Antminer D5 firmware and flash it. Yes right! the antminer Firmware. An Error Message will occour, but at least the old buggy shit will be wiped.

3.) Let it run for 10 min and get the strongu U2 firmware (SIA). Flash it and let it run for 10 min and then use the original firmware. Flash it.

Now it should find both boards again and start hashing. It will take a couple of minutes to reach the max.

Another problem are the fans. To run them more silent the Antminer fans are a good choice. (Nidec Ultra Flow, 1.63A) but make shure both are new. If one of the original fans start to die the miner will go crazy.. (resulting in the software to kill itself?)
On the control board there's a 3 pin connector next to the 4 pin fan connectors. The black wire of the fan plugs should be on the same side as with the 3 pin plug. In case the replacement fan wires are interchanged use a plier and pull off the plastic socket und turn it 180. (or solder the end of a dead fan in the correct order onto the new and most likley to short cabeled new fan)

Anyway.. don't forget to reset the stratums with your own credentials and keep hashing.