How to quickly diagnose Avalon miners' faults?

Takes Avalon miner 851 as an example (A8 and A9 are applicable) to teach you how to use the "CGMiner API Log" module to locate the damaged parts of the miner. Such as Hash board, PMU board, MM board, fan.

First, confirm that the Avalon miner is in regular operation, log in to the Raspberry Pi backstage, click "CGMiner API Log," and then click "Debug Switch," you can observe the real-time operation of the internal components of the Avalon miner.

1. Hash board problem diagnosis

1) When the Avalon miner runs stably, through observation, all the 0th Hash parameters (MWO)>=3000, and the Hash (MW0) values are evenly distributed. If the data of MW0 is much smaller than 3000, you need to replace the 0th Hash board; there are a total of 26 data in MW0, corresponding to the data of 26 chips. If the data of MW0 is less than 26, it indicates that the 0th Hash board is damaged and needs to be replaced. The same applies to MW1, MW2, and MW3. The following figure is a correct example:

2) The TA value represents the total number of chips on the 4 Hash boards. If the TA is not 104, the Hash board needs to be replaced. The following figure is a correct example:

3) ECHU represents the error code of the Hash board, and ECHU [0 0 0 0] proves that the four hash boards are regular; The following figure is a correct example:

4) The default Free frequency is 650MHz. If the actual operating frequency differs too much from the default frequency, it proves a problem with the Hash board, and the Hash board needs to be replaced. The following figure is a correct example:

2. PMU board problem diagnosis

1) PG represents the voltage value. If PG is not "15", it proves a problem with the PMU board. The following figure is a correct example:

2) vi represents the input voltage. The formula "vi/100" calculates the actual voltage value, which is usually around 12V. Suppose the voltage is too high or too low. Then, the PMU board needs to be replaced. The following figure is a correct example:

3) PMUV displays the version number of the PMU board. PMUV only displays the last four digits of the PMU board version. For example, the version number of the Avalon821 PMU board is "8c1711-88cd0000", and the two PMU boards display the version as [0000 0000]. If the version does not match, you need to change the PMU board. The first parameter of PMUV represents the PMU board at positions 0,1 in the figure below, and the second parameter represents the PMU board at positions 2,3. The following figure is a correct example:

3. MM board problem diagnosis

1) MM ID1 represents the version number of the MM board. You can check whether the version of the MM board matches. If not, you need to replace the MM board. The following figure is an example picture:

2) Vo represents the output current. The actual current value is calculated by the formula "vo/10000". The highest current value should not exceed 0.378". If the current is higher than 0.378, you need to replace the corresponding Hash board that exceeds the standard. The figure below is the Correct example:

Note: The average value of Vo for A9 series Avalon miners is around 4200.

3) ECMM represents the error code of the MM board. If ECMM is not "0", Is not normal. The following figure is a correct example: