Some other reasons the hashbord might have shorted parts that could lead to 0 ASICs.
Why not check the signals manually? ZeusBTC have a schematic where you can test all signals(CLK, TX, RX, BO, and RST) to find where the abnormal parts with abnormal signal then focus on that.
Or you can follow the complete guide from ZeusBTC here
https://www.zeusbtc.com/manuals/Antminer-S17-plus-Hash-Board-Repair-Guide.aspAnd then read the part under "V. Common Poor Phenomenon of Hash board and Troubleshooting Procedure" which is related to this issue.
