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Showing posts from October, 2021
What are the precautions and techniques for using the soldering iron? Why can maintenance personnel repair the machine without the circuit diagram? And some maintenance staffs can judge the fault problem only by the appearance of the components? Therefore, it is very important for friends who are first contacted with maintenance to understand the circuit diagram when repairing the motherboard. Next, I will give you a detailed introduction to the problems and precautions in the soldering process of the electric soldering iron , hoping to improve your maintenance technical ability. Problems in welding: 1. Excessive force; 2. The temperature is too high; 3. Unsuitable soldering iron tip; 4. Transfer welding; 5. Improper use of flux solder paste; 6. Improper maintenance of the soldering iron tip and no tinning. Welding strength: 1.  The function of the electric soldering iron is to melt the solder and solder the parts together; 2. Excessive force will cause the chip  pins to be broken. The
How to check and repair the resistance? After some fixed resistors are open or their resistance increases, their surface will have apparent changes such as cracks, pins disconnect, or blackened color. At this time, we can use an intuitive check to confirm whether they are good or bad.  If the appearance of the suspected resistor is normal, you need to test it with a multimeter to determine whether it is normal. Measuring resistance with a multimeter is divided into two methods: in-circuit detection and non-in-circuit detection. In-circuit detection is to directly measure the resistance of the suspected resistance on the circuit board to determine whether it is consistent with the nominal value. Non-in-circuit measurement is to measure the resistance after removing the resistance from the circuit board or suspending a pin. 1. Detect fixed-resistance (1) First, write down the nominal value. If it is a color ring resistor, first find out its resistance value according to the color ring. I
Which components of the Antminer T17 hash board are easily damaged ? T17 hash board (BHB07601) has a total of 30 BM1397AG chips . It adopts double-sided heat dissipation (there are heat sinks on both sides of the hash board). And during long-term continuous operation, some components will easily fail. The easily damaged electronic components of the hash board are described as follows. Schematic diagram of T17 hash board: front, the heat sinks have been removed, this type of heat sink  is soldered to the chip by solder paste, visible ASIC chip. Schematic diagram of T17 hash board: back, the heat sink is fixed on the hash board with soldering paste.   Easily damaged part 1: ASIC chip (BM1397AG) There are a total of 30 BM1397AG chips on the whole board. They are distributed under the front heat sink and connected to the heat sink through the thermosetting adhesive. In daily maintenance, ASIC chip damage is widespread. After the ASIC chip is damaged, the miner will have no hashrate or low
How to detect the capacitor on the repair circuit board? 1. Detect electrolytic capacitor The steps for measuring electrolytic capacitance with a pointer multimeter are as follows: First, use an electric soldering iron to remove the electrolytic capacitor to be tested from the circuit board. Remove the capacitor from the board Second, observe whether the electrolytic capacitor under test has obvious problems such as cracks, broken pins, burnt black, and liquid leakage. If there is, it means that the capacitor has failed. Third, wipe clean the pins of the electrolytic capacitor to be tested and discharge them with tweezers. Clean the Pins and discharge the capacitor Fourth, select the "R*10" gear of the multimeter, and short-circuit the two test leads for zero-return calibration. Short-circuit the two leads Fifth, connect the red test lead of the multimeter to the negative pole of the capacitor and the black test lead to the positive pole of the capacitor and observe the point