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Antminer L7 kernel log common faults and solutions
The following kernel log faults are from Antminer L7, and other Antminer models are for reference only.
Fault 1: Missing a hash board
Solution:
1. Replace the data cable of the hash board that is not shown with the data cable of the normal hash board (only the side of the hash board is exchanged) to eliminate the problem of the data cable and the Antminer L7 control board first.
2. Check whether the total voltage domain of the hash board is normal. If it is abnormal, use a fluke 17B+ multimeter to check whether each PIC, MOS tube, and boost circuit are abnormal.
3. Measure whether the RI signal is normal and directly find the RI signal of a group of chips at the edge of the domain from the intermediate domain for detection. If it is normal, we will check it forward, and if it is abnormal, check it backward (the transmission direction of the RI signal is from the last chip to the first chip).
4. If the kernel log and test fixture detection both show "ASIC=0 or NO hash board", mainly check the voltage and ground value of the RI signal of the chip. If there is any abnormality, most of them are caused by the chip pseudo soldering. So solder it twice; if it can't be solved, replace it with a new BM1489 chip.
Fault 2: power voltage can not meet the target
Solution:
1. Check whether the power cable is loose. It is recommended to re-plug or replaces the power cable with a new one.
2. Replace with a new Antminer L7 adapter power supply, Antminer APW121417 PSU.
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