Follow the map in the video , usually you get the answer in the kernel log in the part that states the following
J[6] has 58 asics
J[7] has 63 asics
J[8] has 63 asics
This usually indicates that hash board J6 was only able to sensor 58 chips, therefore , chip 59 is the one that needs replacing, then what you need to do is measure the voltage and resistance to confirm, you want to that while the hashboard is attached to a control board or you need to buy that fixture device.
Another member here had a similar topic, I can't seem to find it but he did put some great info there, try to search for it.