How to replace Antminer S19 pro hash board SY8003ADFC chip?

SY8003ADFC is a highly efficient, high-frequency synchronous step-down DC-DC voltage regulator IC located on the Antminer S19 pro hash board, silkscreen marked KW***. It integrates a main switch and a synchronous switch, featuring extremely low RDS(ON) values that significantly reduce conduction losses. Its 1MHz switching frequency enables low output voltage ripple while allowing the use of smaller external inductors and capacitors, further saving space. Besides replacing the faulty power step-down chip on the S19 pro hash board, it is also widely used in LCD TVs, set-top boxes, network computers, and access point routers.

The main function of the SY8003ADFC power step-down chip is to reduce the input voltage to a range suitable for the hash board. If it malfunctions, the hash board's voltage becomes unstable, leading to increased current fluctuations, which can overload and heat other electronic components, affecting the overall performance of the miner. If not replaced promptly, prolonged overheating may damage the other critical components of the hash board, even posing a risk of fire.

The specific replacing steps for the Antminer S19pro SY8003ADFC power chip are as follows:

1. Shut down the miner, disconnect the power cord from the power socket, ensuring that the miner is completely powered off.

2. Remove the protective shell on the top of the miner, unscrew the fixed screws of the conductive copper sheet and the outlet cooling fan to remove them, unplug the corresponding cables, then carefully take out the hash board, next place it on an insulated workbench.

3. Use a cleaning brush to clear dust from the hash board.

4. Find the damaged step-down chip and apply a suitable amount of flux around its pins.

5. Adjust the heat gun to approximately 400℃, select the second gear fan speed, and then heat it 5cm above the chip. Once the solder melts, carefully remove the chip using tweezers.

6. Use a cooling fan to cool the hash board, then clean the residual solder on the board with circuit board cleaning fluid.

7. Align the pins of the new SY8003ADFC step-down chip with the solder pads, and apply flux, heat it with the heat gun until the solder wraps around its pins, gently press for a few seconds with tweezers to ensure a secure connection.

8. Repeat step 6.

9. Check the solder joints of the chip pins to ensure there are no virtual joints or short circuits.

10. Place the hash board back into the miner case, fix the conductive copper sheet and the cooling fan of the air outlet with screws, connect the previously unplugged cables, then install the protective cover plate on the top of the miner after ensuring secure connections.

11. Power on the miner, next observe its operating status to ensure that the replaced chip works stably without any abnormalities.

Note: Please wear an anti-static wristband during the replacement process to avoid damaging electronic components due to static electricity.

Regularly checking and replacing various components of the miner can not only extend its service life but also ensure that it operates in the best condition, maximizing mining revenue.