Troubleshooting for Antminer AL1 hash board can not find all ASIC chips

By observing the Antminer AL1 Alephium miner through the kernel log, a single board has shown a malfunction where the number of ASIC chips is incomplete. This may lead to the halt of hashing operations. This article aims to identify the cause of the failure and find a solution.

1. Fault description: The logs indicate that the AL1 miner's chain 0 hash board detected only 29 ASIC chips, while the other two hash boards detected the full count of 84 chips.

2. Troubleshooting steps:

2.1 Use a Antminer universal chip fixture test fixture to diagnose the chain 0 hash board. Below are the connection and usage steps:

a. Correctly insert the 4-pin voltage adjustment cable from the PSU into the test fixture interface.

b. Use a 6-pin power cable to connect the test fixture to power it.

c. Connect one end of the hash board ribbon cable to the test fixture.

d. Insert one end of the USB to TTL cable into the test fixture and connect the other end to the computer;

e. Power on the fixture and allow it to complete its self-test.

f. After the self-test is completed, use red and black alligator clips to clamp the positive and negative terminals of the hash board and the power supply.

g. Finally, insert the other end of the hash board ribbon cable into the hash board.

h. Once all cables are connected, press the test button to begin testing the hash board.

2.2 Next, use the method of short-circuiting the C0 (CI/TX) signal to troubleshoot. For example, first short-circuit chip 29. If the test fixture displays 29 chips, it indicates that chips 1-29 are functioning correctly. Then, short-circuit chip 30. If the test fixture still shows 29 chips, it suggests that chip 30 is faulty and requires further investigation.

2.3 After identifying chip 30 as the potential fault in step 2.2, check the CLK.RST.C0 (CI/TX) signal voltages of the chip. If abnormal signal voltages are detected, inspect the resistance values of the resistors connected to these signals (refer to the normal resistance values of the hash board). If the resistance is abnormal, replace the resistor. If the resistance is normal, it is highly likely that chip 30 is faulty, and it is recommended to replace the BM2460 ASIC chip for Antminer AL1 miners.

Note: We cannot rule out the possibility of poor soldering on the resistors or ASIC chips. After an abnormality is discovered, repair soldering can be performed first to prevent false soldering.

Based on the above content, gradually troubleshoot the single-board failure of the Antminer AL1 hash board to help users solve the problem and keep the ALPH ASIC miner operating for normal profit.