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Hash board repair process

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Post time 2021-11-17 16:43:12 | Show all posts |Read mode
Hash board repair process
This article will mainly introduce the hash board's structure, signal direction, and detection methods to ensure that you can accurately repair the hash board failure.
1. The working principle of the hash board
Hash board calculates the hash value on the blockchain through a particular algorithm and determines your income based on the hash value. The working principle is that the control board sends calculation commands and calculation formulas to the hash board through the TX (co) signal, the calculation result is transmitted to the control board via the RX (RI), and the control board saves the results to its account through the network.
2. The structure of the hash board
1) The power management part provides a working environment for the hash board. Including pic, DC-DC, boost circuit, LDO circuit, and 24v power supply circuit constitute the power supply environment. Provide suitable voltages for different channels of the hash board chip.
2) The CLK circuit of the hash board. The function of the clock circuit is to coordinate the orderly operation of the various chips, the hash board, and the control board.
3) The RST circuit resets the hash board and restarts the calculation.
4) The CO circuit accepts instructions from the hash board and starts work.
5) The RI circuit sends the calculation result back to the control board.
6) The BO circuit reflects the working state of the chip. For example, a 0.1-0.3V voltage jump (pulse signal) proves that the RI signal is transmitted back usually, and the hash board is working normally.
3. The signal direction of the hash board
1) The CLK signal (which is sent by a 25M crystal oscillator), CO signal (the control board sends out calculation commands), the RST signal (sends from the control board to make each chip ready) first arrive at chip 1. It then is sorted by chip 1 pass to chip 2, and so on. If which chip can't continue to pass, there is a problem with that chip.
2) RI is a return signal, starting from the last chip, passing to the previous chip, and finally passing to the control board from the first chip (control board command, transmitted once at a particular time).
4. Measurement method (Take L3+ hash board as an example)
1) First, ensure that the working environment is normal and the working voltage of 10v, 14v, and 24v is standard. Use a Fluke 15b+ multimeter to measure 12v at both ends of the c943 capacitor at the corresponding detection point (if there is no power, the power socket is not plugged in), 10.4v at both ends of the c948 capacitor (if there is no power, see the fixture information, whether the pic is standard, if it is normal, replace the power management module, and Three mos tubes), 14v at both ends of the c1072 capacitor (if there is no power, directly replace the boost chip).
2) The voltage is standard, and the test fixture test result is 0. Starting from the 72nd BM1485 chip, check the RI voltage. If there is no voltage output, change the chip, re-soldering first, take it off, measure the LDO voltage (you can also test first), and change the chip.
3) The test result of the fixture is not 0, but there are not enough 72 pieces. If there are only 48, first connect the 46 output COs and then test the fixture. If the 47th chip is standard, then test the ground resistance of the 48th chip. The measurement result is compared with the previous good. If it is not normal, it proves that the chip is bad. Standard, power on, and measure the voltage before and after the chip. If the front is abnormal, the 47th chip is tested; if the back is abnormal, the 49th chip is tested. And so on.
4) Method 3 cannot determine the chip abnormality, so method 2 is needed to determine the faulty chip. The method is to connect the CO test point from the 40th chip to see if the output voltage of the 40th chip can be detected. If it can, the abnormal chip is behind this. If not, the problem is before the 40th chip, and then use method 2 to confirm The status of the first 20 chips, and so on, until confirmed.
5. The hash board is repaired until all faulty chips are detected by the test fixture.

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