If you can find the hash PCB with no RED LED, that is more than likely the non-hashing PCB.
You can send it to Hong Kong if the unit is still under warranty, or you can send it to USA for repair with fee.
*NOT ALL DAMAGED HASH PCB CAN BE REPAIRED. SOME ARE SIMPLY DEAD AND CAN NOT CPR TO LIFE... (If you see PCB burnt and layers peeling off as example)
I currently have 5 s7 rigs, and 2 of them started to show less numbers of basic# and 1 only 2 x.
I updated the firmware, by the way, i didn't know which one to choose and did it with the 700m thinking it is the clock number it had on the previous firmware... but the problem still there.
any help?