How to replace the PIC16F1704 chip?

PIC16F1704 is an 8-bit processor microcontroller suitable for Antminer S19, T19, S19+, 17 series, 15 series, L3+, and S9 hash boards. Its operating temperature range is -40°C to 85°C. The device is based on the PIC core architecture and typically operates from a supply voltage of 3.3V to 5V. When the error message "fail to read pic temp" appears in the log, it means that the PIC chip is abnormal.

If the PIC16F1704 chip on the hash board is damaged, the miner will stop working. The failed PIC16F1704 chip needs to be replaced in time to extend the miner's service life.

Detailed steps to replace the PIC chip

(1) How to remove a faulty chip?

• Disassemble the miner, take out the abnormal hash board, and place it on an insulating pad.

• Apply flux around the PIC chip pins, start the hot air gun to adjust the temperature to about 400°C, adjust the wind speed to 2 gear, and aim it at the top of the chip to heat and melt the solder on the pad.

• Use stainless steel tweezers to clamp the PIC16F1704 chip. After the tin on the chip pad melts, clamp and take off the faulty chip.

• Carefully clean the hash board with circuit board cleaner and use a cooling fan to cool it.

(2) How to replace and install new PIC chip？

• Add a small amount of solder paste to the PIC chip pad. Place the new PIC16F1704 chip into the pad, align the pins, and add flux. Start the heat gun to heat the tin on the pad to wrap the chip pins.

• After the replacement is complete, use a cooling fan to cool the hash board, then clean up the remaining flux oil.

• Program to write hash board PIC chip. If you don't know how to program it, refer to "How to reprogram the PIC chip on the L3+ hash board using PicKit3?"

• After successful programming, we need to use the test fixture to test the single board. If the test result is normal, the chip replacement is successful.

• Put the hash board into the miner box and power it on to test whether the whole machine has recovered.

By following the above steps, you can effectively replace the PIC16F1704 chip and restore the miner's normal operation.