How to Repair Antminer S9 Hash Board?

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I. Requirements on the Maintenance Platform

1. The constant temperature soldering iron above 80W (soldering temperature: 300-350°C). The end soldering iron head is useful for soldering chip resistors and capacitors. The blade type soldering iron head is employed for soldering and replacement of plug-in components (soldering temperature: 380-420°C)

2. The thermal chimney is used for chip disassembly and soldering, be mindful not to heat for quite a long time in order to avoid PCB foaming (soldering temperature: 260°C ±2 °C).

3. The AC controllable power supply voltage regulator (output 200-250V, can limit 0-20A current) is useful for APW8 power-on inspection. When there is no such condition, a 100W ordinary bulb can also be strung on the AC fire line with mains. Be careful.

4. For electronic load (power 2KW, meet with the voltage 0-50V), if you have no such condition, a resistive load that matches the APW8 may also be made.

5. The fluke 15b+ multimeter, suction gun, tweezers, V9-1.2 test jig and special power test card firmware (if there's condition, an oscilloscope may be configured).

6. Flux, lead-free tin wire, water for cleaning panel with anhydrous alcohol; water for cleaning panel can be used to completely clean flux residue and appearance after maintenance.

7. Thermally conductive silicone grease (2500) is used to correct the thermal conduction between the MOS and the cooling fin, thermal conductive silicone (704 silica gel) is employed for fixing and since the glue damage at the first after the repair of the PCBA components

II. Requirements on Maintenance Operations

1. The maintenance personnel must have certain electronic knowledge, several year of maintenance experience, and a particular knowledge of the working principle of switching power supply, and well master the soldering technology.

2. Before the merchandise is opened and the PCBA panel is repaired, the large capacitor should be discharged, and the voltage must be measured with a multimeter (less than 5V discharge), and then your soldering operation could be performed! Be sure to confirm in order to avoid electric shock.

3. Pay attention to the working method when judging the circuit components. After replacing any device, the PCB panel has no obvious deformation, the soldering of bonding pad is reliable, and the replacement parts and the surrounding area have no issue such as insufficient parts, open circuit or short circuit.

4. After replacing the main element components, the key circuit shall haven't any short circuit and other obvious abnormalities prior to the AC voltage test, otherwise there's an invisible risk of explosion.

5. It needs AC220V voltage to judge the circuit signal; pay attention to operational protection.

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