BM1398 BM1398BB BM1398AC Original Replacement Antminer Hashboard ASIC

BM1398 / BM1398BB / BM1398AC Original Bitmain ASIC – Antminer Hashboard Replacement

The BM1398 family — including BM1398BB and BM1398AC variants — is the Bitmain SHA-256 ASIC chip deployed across Antminer S19, S19 Pro and T19 hashboards. It is one of the highest-volume mining ASICs ever produced and remains the workhorse silicon for the millions of S19-class units still in operation. We source it original and brand new from our supply chain. When a hashboard reports dead chips on the test fixture or in the kernel log, replacing the failed BM1398 / BM1398BB / BM1398AC at the flagged positions is the standard repair, and done correctly the hashboard returns to nominal hashrate.

BM1398 on the S19 / S19 Pro / T19 Hashboard

S19-class hashboards run a long chain of BM1398 ASICs in series across multiple voltage domains. A single dead chip breaks the chain and takes the entire domain offline in the kernel log; multiple dead chips spread across different domains usually points to a thermal event, a power-rail fault or an upstream chip-driver issue rather than a chip-level failure. The standard ops flow is: read the failed positions from the kernel log or the test fixture, isolate the board, rework the suspect chip(s), and re-test on the BM1398 series fixture before sending the board back to the miner.

Replacement Procedure

Pre-heat the hashboard to 130-150°C with an IR pre-heater. Use a hot-air rework station at 340-360°C with a small nozzle to lift the failed BM1398 — protect the surrounding chips with kapton tape and ensure neighbouring devices stay below their reflow temperature. Clean the pads with flux and braid, lay down fresh paste matching the board's original solder process, place the new BM1398 with vacuum tweezers respecting the orientation mark, then re-flow. Always retest on a BM1398 series ASIC fixture before reinstalling the hashboard in the miner.

BM1398 / BM1398BB / BM1398AC Specifications

Related BM1398 / S19 Repair Parts

• BM1398 / BM1398BB Tin Tool Fixture – S19 S19Pro T19
• BM1398 Stencil Plate – S19 S19Pro T19 Repair
• BM1398AD ASIC Chip – S19a S19a Pro
• Antminer S19 / S19pro / T19 Bitmain Control Board

Repairing S19 / S19 Pro / T19 hashboards in volume? Contact us at contact@lys-sz.com for tray-quantity BM1398 pricing. Worldwide shipping from our Shenzhen warehouse.