{"product_id":"antminer-z11-hashboard-repair-service","title":"Antminer Z11 Hashboard Repair Service","description":"\u003cp\u003e\u003cstrong\u003eAntminer Z11 hashboard repair covers the board the miner has stopped listing and the board still hashing short. The Z11e and Z11j carry the same board and get the same repair. A healthy board reports three chips, one per power domain, and any other number is a fault. Component-level repair in the USA takes 4-5 business days.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAntminer Z11 hashboard repair usually begins with a board that was blamed too early. On this machine a power supply that sags under the full three-board load produces exactly the picture a dying board produces — a chain that comes and goes, a chip marked x, output that will not stay up — and after enough months of that the board's input power stage burns for real, and the guess becomes true. So every board here starts on a supply that can actually feed it, and only then goes through the route any hashboard takes in our USA-based lab: board-level diagnostics, component-level repair down to the chip, cleaning and thermal work, and validation under load inside a running miner. The Z11e and Z11j are handled on this page as the same job. Working out which of the three boards failed is not something you need to do before writing to us.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Diagnostics and Common Issues with Antminer Z11\u003c\/h2\u003e\n\n\u003ch3\u003eQuick Symptom Checklist\u003c\/h3\u003e\n\u003cp\u003eThese are the readings Z11 owners describe most often. Chain numbers, chip counts and rates differ from machine to machine — match the shape of what you see, not the digits.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOne of the three chains is missing from the status page — sometimes from the moment the miner boots, sometimes after hours of hashing — and a restart brings it back for a while\u003c\/li\u003e\n\u003cli\u003eTotal output settles at two thirds of what the machine is rated for — around 90 kSol\/s where 135 belongs on a Z11 — and stays there\u003c\/li\u003e\n\u003cli\u003eA chain lists 0 chips, or 2, where a healthy board shows 3 — the count is the message, whichever line it appears on\u003c\/li\u003e\n\u003cli\u003eASIC status shows an x for one chip on a chain that used to show three good ones\u003c\/li\u003e\n\u003cli\u003eThe miner is stable with one or two boards fitted and falls apart only when all three are in and hashing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFive lines from the kernel log of one of our own Z11s, in the order the log wrote them, from the minute one of its three boards went short. The timestamps, the process number and the chain letters will be different on your machine; what to compare is the number after \u003ccode\u003ehas\u003c\/code\u003e, and whether it stays the same from one pass to the next.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ccode\u003eSep 15 03:07:39 (none) local0.notice cgminer[971]: check_asic_reg: chain J0 has 3 ASIC\u003c\/code\u003e, a board answering with all three of its chips\u003c\/li\u003e\n\u003cli\u003e\n\u003ccode\u003eSep 15 03:07:40 (none) local0.notice cgminer[971]: check_asic_reg: chain J1 has 3 ASIC\u003c\/code\u003e, the second board, the same\u003c\/li\u003e\n\u003cli\u003e\n\u003ccode\u003eSep 15 03:07:42 (none) local0.notice cgminer[971]: check_asic_reg: chain J2 has 2 ASIC\u003c\/code\u003e, the third board answering with two — this is the fault\u003c\/li\u003e\n\u003cli\u003e\n\u003ccode\u003eSep 15 03:07:57 (none) local0.err cgminer[971]: reg_handle CRC error crc = 02\u003c\/code\u003e, a reply from the chain arrived damaged: the board is talking, and what it says cannot be trusted\u003c\/li\u003e\n\u003cli\u003e\n\u003ccode\u003eSep 15 03:08:11 (none) local0.notice cgminer[971]: software_set_address_chain chainID2 asics 1 addrInterval 64\u003c\/code\u003e, the next pass over the same board finds one chip, not two\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTwo things are worth ruling out before anything ships. A machine that does not appear on the network at all, or gives no web interface, is most often a control-board or network matter, and that case is handled on our control-board service rather than here — with one exception: if the power supply itself will not start, a shorted hashboard is among the causes, and the boards are worth checking before the control board takes the blame. And a supply on a 110 V circuit that is not rated for the whole machine will drop boards that have nothing wrong with them — its own label states what it delivers on that line.\u003c\/p\u003e\n\n\u003ch3\u003eModel-Specific Patterns We See on Antminer Z11\u003c\/h3\u003e\n\u003cfigure\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0788\/4917\/9921\/files\/antminer-z11-bm1744ab-cracked-asic-chip-macro.webp?v=1789439402\" alt=\"Cracked BM1744AB ASIC chip on an Antminer Z11 hashboard, macro view\" width=\"1200\" height=\"675\" loading=\"lazy\"\u003e\n  \u003cfigcaption\u003eCracked BM1744AB ASIC found on an Antminer Z11 hashboard during diagnostics\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cp\u003e\u003cstrong\u003eA chip that looks whole and is not.\u003c\/strong\u003e A hairline crack in the package of a BM1744 does not show under ordinary light: held in the hand, or photographed without that glare, the chip reads as intact, and only light skimming across its face at a low angle brings the line up. That is a trait of these chips rather than a rare case, so a visual once-over that finds nothing proves nothing about the board — its chips are measured one by one whether or not any of them looks damaged. That is the crack's quiet face. Its usual one is louder: a cracked chip, as a rule, shorts the board, and then there is no count of 2 of 3 to read — the chain enumerates no chips at all, and sometimes the power supply will not start either, so the whole miner sits dark and looks dead. A Z11 that will not come up at all can be carrying exactly this board.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe board that took the blame for the supply.\u003c\/strong\u003e A chain that comes and goes, then reports no chips, then comes back after a restart: on this machine that picture is produced by a supply sagging under the full three-board load at least as often as by the board itself. The tell is in the checklist — the miner runs for a day on two boards and fails on three. Left on a sagging supply long enough, the board's own input power stage burns, and at that point the board is genuinely faulty. A supply problem turns into a board repair with time, which is why the first thing we do is separate the two.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOne chip, one domain.\u003c\/strong\u003e A Z11 board carries three chips and three power domains, one chip in each. When a domain's power stage fails the count on that chain drops by exactly one — from 3 to 2, not to zero — and the chip behind it may be perfectly intact, waiting for its power to come back. A board reporting 2 of 3 is the partial failure this hardware produces, and it is a domain repair before it is a chip replacement. A board at 0 of 3 is a different fault: the chain signal itself has stopped, at a chip or in the path between them.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWall power that looks like a dead board.\u003c\/strong\u003e The machine draws about 1418 W and expects a 12 V supply of 1.2 kW or more behind it. On a 110 V residential line the usual supplies do not deliver that, and the miner reports the shortfall the only way it can — a chain dropping out, a chip marked x, a rate that will not climb — so the owner buys a replacement board and nothing changes. Nothing on the board was wrong.\u003c\/p\u003e\n\n\u003ch3\u003eHardware Notes\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;table-layout:fixed;font-family:sans-serif;font-size:14px;margin:16px 0 24px;\"\u003e\n\u003ccolgroup\u003e\n\u003ccol style=\"width:32%\"\u003e\n\u003ccol style=\"width:68%\"\u003e\n\u003c\/colgroup\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:rgb(248,248,248);border-bottom:2px solid rgb(238,238,238);\"\u003e\n\u003cth style=\"padding:12px;text-align:left;vertical-align:top;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:12px;text-align:left;vertical-align:top;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eModels covered\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eAntminer Z11, Z11e and Z11j. The three are rated differently as machines and carry the same hashboard, so one board and one repair cover all three. Quote the model from the label when you write.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eAlgorithm and cooling\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eEquihash — the Zcash family of coins. Air-cooled, two fans, the machine's own external power supply.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eMiner hashrate\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e135 kSol\/s from three hashboards on the Z11, so one board is about 45 kSol\/s of the total and with one board out the machine settles around 90 kSol\/s. The Z11e and Z11j are rated differently, and the figure to hold on to is the share, not the number: on every model here one board is a third of the machine, a lost board shows as a third of the hashrate gone, and lower than that means a second board is also short.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eHashboards per miner\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e3, each shown as its own chain in the miner's status page.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eChips per board\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e3 on a healthy board. Any other number the miner reports for that board is a fault, and a count of 3 is not by itself proof that all three are producing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eHow the chips are grouped\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eThe log's unit is the chain, one chain per board: \u003ccode style=\"word-break:break-all;\"\u003eJ0\u003c\/code\u003e, \u003ccode style=\"word-break:break-all;\"\u003eJ1\u003c\/code\u003e, \u003ccode style=\"word-break:break-all;\"\u003eJ2\u003c\/code\u003e in the chip count (\u003ccode style=\"word-break:break-all;\"\u003echain J2 has 2 ASIC\u003c\/code\u003e), and the same third board written \u003ccode style=\"word-break:break-all;\"\u003echainID2\u003c\/code\u003e in the addressing line; the status page numbers those boards 1 to 3. Inside a chain, three power domains, one chip in each. There is no group behind a chip on this board: a domain that fails takes exactly one chip with it, so a board at 2 of 3 is the characteristic partial failure here.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eChip family\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e\n\u003ccode style=\"word-break:break-all;\"\u003eBM1744\u003c\/code\u003e, marked \u003ccode style=\"word-break:break-all;\"\u003eBM1744AB\u003c\/code\u003e on the boards that have been through this lab. Letters after the number are a marking of the same chip family, not a different board or a different model; replacements are matched to the marking on your board, and the chips are in supply.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eHashboard marking\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e\n\u003ccode style=\"word-break:break-all;\"\u003eBEZ24601_Hashboard_V2.0\u003c\/code\u003e, printed on the board itself. Every Z11 board that has reached us carries this string. Quote it when you write and we know what you have before the parcel does.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003ePower supply\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eExternal. The machine draws about 1418 W at the wall and needs a 12 V supply rated 1.2 kW or more — which supply it is matters less than whether it holds that under a full three-board load.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eControl board\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e\n\u003ccode style=\"word-break:break-all;\"\u003eCtrl_C43 V1.0\u003c\/code\u003e, specific to this model. It does not interchange with the control boards of later Equihash Antminers such as the Z15, and we supply it separately.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat the Log Is Telling You\u003c\/h3\u003e\n\u003cfigure\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0788\/4917\/9921\/files\/antminer-z11-miner-status-chain-3-one-asic-x.webp?v=1789442209\" alt=\"Antminer Z11 Miner Status: chain 3 shows ASIC# 1, status x and 0.00 KSol\/S, whole miner at 63.56 KSol\/S\" width=\"1200\" height=\"384\" loading=\"lazy\"\u003e\n  \u003cfigcaption\u003eMiner Status on one of our own Antminer Z11s: chain 3 enumerates a single ASIC at 0.00 KSol\/S while the miner totals 63.56 KSol\/S\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cp\u003eYou do not need to act on any of this. It is here so you know what state your board is in before you decide to ship it.\u003c\/p\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;table-layout:fixed;font-family:sans-serif;font-size:14px;margin:16px 0 24px;\"\u003e\n\u003ccolgroup\u003e\n\u003ccol style=\"width:34%\"\u003e\n\u003ccol style=\"width:33%\"\u003e\n\u003ccol style=\"width:33%\"\u003e\n\u003c\/colgroup\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:rgb(248,248,248);border-bottom:2px solid rgb(238,238,238);\"\u003e\n\u003cth style=\"padding:12px;text-align:left;vertical-align:top;\"\u003eWhat you see\u003c\/th\u003e\n\u003cth style=\"padding:12px;text-align:left;vertical-align:top;\"\u003eWhat it usually means\u003c\/th\u003e\n\u003cth style=\"padding:12px;text-align:left;vertical-align:top;\"\u003eWhat we do with it\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e\n\u003ccode style=\"word-break:break-all;\"\u003echeck_asic_reg: chain J0 has 3 ASIC\u003c\/code\u003e and \u003ccode style=\"word-break:break-all;\"\u003echeck_asic_reg: chain J1 has 3 ASIC\u003c\/code\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eThe line every board should print: all three chips answered the register check. Whatever the third chain says, these two boards enumerated in full.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe take it as the machine's baseline and still measure each of those three chips on its own before the board is signed off — enumerating is not the same as producing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e\n\u003ccode style=\"word-break:break-all;\"\u003echeck_asic_reg: chain J2 has 2 ASIC\u003c\/code\u003e, or the status page listing 2 chips where 3 belong\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eOne of the three chips on that board did not answer. Any number below three on this line is a fault on that board, and with one chip per domain the shortfall is either that chip or the single domain feeding it.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe repair the domain first and re-count; the chip behind it is only replaced if it is still dead once its power is back.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e\u003ccode style=\"word-break:break-all;\"\u003ereg_handle CRC error crc = 02\u003c\/code\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eA reply came back from the chain with its checksum wrong. The board is talking, but part of what it says arrives damaged — a chip failing at the edges, not one that has gone.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe treat it as a live fault rather than a dead one: a chip that answers wrongly is found by measuring it, because as long as the board still enumerates, no count will point at it.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003e\u003ccode style=\"word-break:break-all;\"\u003esoftware_set_address_chain chainID2 asics 1 addrInterval 64\u003c\/code\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eThe addressing pass over the same board, a few seconds after the check found two chips, now finds one. A number that drifts from one pass to the next, with CRC errors beside it, is a chip breaking down rather than a board that has vanished.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe do not read the count off any single pass. The board goes on the bench, each chip is measured individually, and the one that fades under load is the one replaced.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eOne of the three chains drops off the status page, comes back after a restart, then drops again\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eEither the supply sags under the full load or the board's own input power stage is failing — and the second usually grows out of the first over months.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe run the board on a bench supply that holds 12 V under full load. If it stays up there, the supply is the answer; if it still drops, we repair the input stage.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eA chain reports 0 chips where 3 belong\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eThe miner found nothing on that board. A dead domain, a dead chip and a broken chain signal look identical from the dashboard.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe power the board on the bench and establish which of the three domains is down before any chip is touched.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eAn x in ASIC status against a chain — on the screen above, chain 3 at ASIC# 1 and 0.00 KSol\/s\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eThat chip is not answering. On this board it means the chip itself or the single domain feeding it.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe measure each of the three chips individually, because three chips leave nowhere for a weak one to hide.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eAround 90 kSol\/s instead of 135 on a Z11 — on a Z11e or Z11j, a third of the rated output gone\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eExactly one of three boards is out. The other two are doing their job.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe treat it as a single-board job and tell you if the other two need anything.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eThe machine runs for hours or days on one or two boards and fails only with all three fitted\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eThe supply cannot carry the full load. The boards are usually fine.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe test the board under a supply rated for the machine and, if it passes, it goes back with no repair billed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom:1px solid rgb(238,238,238);\"\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eNo web interface at all, or the miner never appears on the network\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eMost often a control-board or network problem rather than a hashboard. If the power supply itself will not start, a shorted hashboard is one of the causes.\u003c\/td\u003e\n\u003ctd style=\"padding:12px;vertical-align:top;word-break:break-word;\"\u003eWe look at the control board separately — recovery where possible, a replacement where not — and where the supply will not start, the boards are checked for a short as well.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eDiagnostics Focus\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSupply before board.\u003c\/strong\u003e On the Z11 a sagging supply and a burnt board are indistinguishable from the dashboard, so nothing is judged until the board has run on a bench supply that holds 12 V at full load. A board that only ever failed on a weak supply goes home unrepaired, and the report says so — that is a cheaper answer than a repair, and it is the true one.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDomain before chip, and every chip measured.\u003c\/strong\u003e With three chips and three domains there is no group to hide a weak chip in and no majority to average it away. We prove which domain is down first, then measure each of the three chips on its own, so a chip that merely lost its power is not replaced and a chip that is genuinely dead does not go back because the board looked complete on a cold bench.\u003c\/p\u003e\n\n\u003ch2\u003eOur Professional Repair Process\u003c\/h2\u003e\n\n\u003ch3\u003eGotchas\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWe do not condemn a board on a weak supply.\u003c\/strong\u003e Every Z11 board that comes in is powered on a supply that holds its 12 V under the full load before a word is said about it. Boards that failed only because the miner's supply was tired are not rare on this model, and they go back untouched with a note saying what actually happened.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA dark chip is not yet a dead chip.\u003c\/strong\u003e One chip per domain means a domain failure switches off exactly one chip, and that chip is not billed until its domain has been repaired and it has been measured on its own. A chip count read off a dashboard or a photograph is a guess; the count that goes on your invoice is taken after the power is back.\u003c\/p\u003e\n\n\u003ch3\u003eTypical Service Scenario\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBought in a lot, switched on, one board short.\u003c\/strong\u003e Z11s change hands used, often several at a time, with a supply of unknown age in the box. The first full load in months finds the weakest of the three boards, and the buyer's first sight of the machine is a chain that will not stay up.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA supply that faded slowly.\u003c\/strong\u003e A third-party supply that held its output when new and, after a year or more, no longer does under three boards. The board that draws hardest is the one whose input stage gives way, and by the time it reaches us the supply has already been replaced — too late for that board.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA residential circuit.\u003c\/strong\u003e The machine set up at home on a 110 V line with a supply that cannot feed all three boards there. Boards drop, a replacement board is bought, the replacement drops too. The board that then arrives here for repair is usually the healthiest part of the setup.\u003c\/p\u003e\n\n\u003ch3\u003eWhat Happens After Intake\u003c\/h3\u003e\n\u003cp\u003eThe choice above between \u003cstrong\u003eHashboard only\u003c\/strong\u003e and \u003cstrong\u003eComplete miner\u003c\/strong\u003e sets what arrives here, not what it costs — the price is the same either way, and the complete miner is the right pick when you would rather not pull the board yourself, because we find it on the bench. Every board follows the same route through our USA-based lab: intake and incoming inspection, then diagnostics, then component-level repair, then cleaning and replacement of the thermal interface, then testing — on STASIC and ASIC REPAIR fixtures first and for a minimum of one hour inside a live miner under load afterwards. Extended burn-in beyond that hour is available as a separate add-on. Chips, where they turn out to be genuinely dead, are billed separately from the repair, because on this board the number cannot be known until the domain feeding them is back.\u003c\/p\u003e\n\n\u003ch3\u003eDiagnostics and Validation Equipment\u003c\/h3\u003e\n\u003cfigure\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0788\/4917\/9921\/files\/antminer-z11-hashboard-asic-repair-tester-3-chips-found-pass.webp?v=1789439403\" alt=\"ASIC.REPAIR tester running an Antminer Z11 hashboard: chips found 3, test passed, no issues detected\" width=\"1912\" height=\"558\" loading=\"lazy\"\u003e\n  \u003cfigcaption\u003eAntminer Z11 hashboard on the ASIC.REPAIR stand: three chips found, test passed\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cp\u003eBench measurement on a supply rated for the full machine, STASIC and ASIC REPAIR test fixtures for chip count and work verification, each of the three chips measured on its own, and final validation inside a working miner under real load. The fixture proves the chain; the per-chip measurement finds what a count of three can hide; only the miner proves the board.\u003c\/p\u003e\n\n\u003cp\u003eAll repairs are performed personally by Alex, who has been servicing ASIC miners since 2019. \u003ca href=\"https:\/\/antminer-repair.com\/pages\/aleksandr-muranov\"\u003eSee credentials →\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003eContact our repair team today and get your miner back to full power. \u003ca href=\"https:\/\/antminer-repair.com\/pages\/contact\"\u003eContact us\u003c\/a\u003e\u003c\/p\u003e\n","brand":"Antminer Repair","offers":[{"title":"Hashboard only","offer_id":54671196160273,"sku":"HB-Z11-HBONLY","price":300.0,"currency_code":"USD","in_stock":true},{"title":"Complete miner","offer_id":54671202779409,"sku":"HB-Z11-COMPLETE","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0788\/4917\/9921\/files\/antminer-z11-hashboard-heatsinks-installed-angled_d5ca09da-4796-43ed-a8a4-c31f50217212.webp?v=1789439429","url":"https:\/\/antminer-repair.com\/products\/antminer-z11-hashboard-repair-service","provider":"Antminer Repair","version":"1.0","type":"link"}