Antminer L9 "Chain Only Find 0 ASIC" — Hashboard Not Detected: Causes & Fix

What "find 0 asic" means on an L9

Every time an Antminer L9 starts, the control board walks each of its three hashboard chains and asks every Scrypt chip to report in. When none of the chips on a chain answer, the kernel log shows a line like this:

What it looks like in the kernel log

Chain 1 only find 0 asic, will power off hash board 1

On some firmware it is followed by ERROR_SOC_INIT: soc init failed.

The miner then switches that board off and carries on with the other two, so you lose roughly one third of the L9's hashrate. Because the miner keeps running, this fault often goes unnoticed for days unless you watch per-board hashrate.

Zero is different from "fewer than expected". If a chain reports some chips but not all of them, the chain works up to a certain point and breaks further along — typically a failed chip or a dead voltage domain. "Find 0 asic" means the very first link failed, or the board never got usable signal or power at all.

Common L9 kernel log messages and what they mean

Search engines often send people here with a line copied straight from the log. These are the messages we see most often on L9s that come in with a missing board. Exact wording can vary slightly between firmware versions.

Causes, from simplest to most serious

Safe checks you can do yourself

Bitmain's own guidance for a missing hashboard is to check the cables first and then try a firmware update or SD-card recovery, and it warns that blindly restarting a miner with a hardware fault can cause irreversible damage. Work through these in order, once:

1. Step 1

   Save the kernel log

   Copy the full log before you power-cycle. It lives in memory and is lost on reboot, and it tells a technician exactly which chain failed and how.

2. Step 2

   Power off, then reseat the data cable

   Unplug the miner, wait for it to discharge, and unplug and re-plug the data cable on both ends of the failed chain. Look for bent pins or burn marks.

3. Step 3

   Swap the cable and the slot

   Try a known-good cable, then move the board to another slot. Note whether the error stays with the slot, the cable or the board.

4. Step 4

   Rule out the power supply

   If you have a known-good PSU of the correct model, test with it. A weak PSU can fail to bring boards up at start-up.

5. Step 5

   Update or recover the firmware

   If the error stays with one slot, update the firmware or recover the control board from an SD card.

If the error follows the board to every slot, with a good cable and a good PSU, the fault is on the hashboard. Stop restarting the miner at that point — more power cycles on a shorted board can turn one failed part into several.

How we repair an L9 board that finds 0 ASIC

On the bench, the board goes on a test fixture that drives the chain directly, without the miner. We measure each voltage domain for shorts before applying full power, trace the clock, reset and data signals from the connector into the chain to see where they stop, and use thermal imaging under load to find a chip or power component that is not behaving. The failed part is replaced, the board's thermal interface is refreshed, and the board runs a full-load burn-in before it goes back.

A solo L9 is typically back in 1–3 days, and small batches are typically finished within 1–2 weeks. If the L9 is also running hot or slowly losing hashrate, read our L9 overheating and maintenance guide — heat is the most common reason an L9 board fails in the first place. For pricing and service details, see our Antminer L9 repair page.

Frequently asked questions

What does "Chain X only find 0 asic" mean on an Antminer L9?

During start-up the control board asks every chip on each hashboard to report in. "Find 0 asic" means not a single chip on that chain answered, so the miner powers that board off and keeps running on the others. The L9 then hashes at roughly two-thirds of its rated speed.

Is "find 0 asic" a cable problem or a dead hashboard?

It can be either. Power the miner off, reseat or swap the data cable, and move the board to another slot. If the error stays with the slot or the cable, the problem is there; if it follows the board wherever you put it, the fault is on the hashboard itself.

What is the difference between "find 0 asic" and finding fewer chips than expected?

Zero means nothing on the chain responded — usually a signal, power or first-chip problem. A partial count means the chain works up to a point and breaks further along, which usually points to a failed chip or a dead voltage domain at that position.

Should I keep restarting the L9 to see if the board comes back?

No. Bitmain warns that repeatedly restarting a miner with a hardware fault can make the damage worse. Save the kernel log, do the basic cable and slot checks once, and if the board still isn't found, have it diagnosed.

Can an L9 board with "find 0 asic" be repaired?

In most cases, yes. The fault is usually one failed component — a chip, a power-rail part, a connector or a cracked solder joint. It is found on a test fixture and repaired at the chip level, which costs far less than a replacement hashboard.