The hash boards of the Antminer S19K Pro primarily use two types of substrate materials:

Aluminum Substrate: The base layer of this board is metal aluminum. Its greatest advantage is excellent heat dissipation
performance, as aluminum can rapidly conduct heat away from the chips, helping the miner maintain stability in high-temperature
environments. Correspondingly, its cost and weight are also higher.

Non-Aluminum Substrate (Standard PC Board): This is the traditional glass fiber circuit board (FR-4). It has a lower initial cost,
but its heat dissipation capability is not as good as that of the aluminum substrate, making it more reliant on a well-designed
external cooling environment.

The most intuitive method to distinguish between the two is by observing the color and texture of the circuit board: the back of
an aluminum substrate typically has a metallic silver-white color and feels hefty, whereas non-aluminum substrates are usually the
common green or black color seen on standard PCBs.

Maintenance and Replacement

When a mining machine experiences hashrate abnormalities, it is likely that one of the hash boards has failed. For faulty hash
boards that cannot be repaired, replacing them with new ones is an effective method to restore the miner to normal operation. When
purchasing a replacement, it is essential to confirm the specific version of the hash board required (aluminum substrate or
non-aluminum substrate) and ensure it is fully compatible with your miner model