Iceriver KS3M Hashboard Repair Guide & Components List

Iceriver KS3M Hashboard Repair Guide & Components List (2026 Update)

The Iceriver KS3M is the mid-tier model in the Iceriver KS3 family — sitting between the higher-power KS3 and the lower-power KS3L, with shared ASIC chip architecture across all three models. Built around the same Iceriver proprietary chip used on the KS3 and KS3L hashboards, the KS3M lets fleet operators run a single repair inventory across the entire KS3 lineup. This guide covers the 13 most vulnerable components on the KS3M hashboard, the KS3-family diagnostic workflow with the dedicated test fixture, and the full repair playbook with direct sourcing links — paired with our companion Iceriver KS5L hashboard repair guide for full KAS-mining-line coverage.

Why Iceriver KS3M Hashboard Repair Matters in 2026

The KS3M sits in the middle of the KS3 family, offering a balanced hashrate-to-power profile that has kept many KS3M units profitable in low-cost-power environments. The shared ASIC chip across KS3, KS3M, and KS3L means a single chip inventory covers repair needs for all three models, and the shared PSU (BP-H-3640), control board, cooling fan, and chassis components further consolidate the repair-bench inventory. Component-level repair is significantly cheaper than full hashboard replacement, especially on Iceriver platforms where replacement boards are constrained in supply.

Iceriver KS3 Family Positioning

The KS3M shares its hashboard architecture with the rest of the KS3 family. All three models use:

• Same ASIC chip family — the Iceriver KS3-series ASIC, cross-compatible across KS3, KS3M, and KS3L hashboards
• Same architectural topology — 28 voltage domains organised in series, with a boost circuit feeding the top domains and direct rail powering the lower domains
• Same supporting BOM — TMP75 temperature sensor, T250 crystal oscillator, MP1517DR boost converter, SGM2036-ADJ LDO, MP2019 LDO, SN74AUP1T34DCKR level translator, LMBR140T1G Schottky, plus the 47µF / 330µF / G337 capacitors
• Same PSU family — the BP-H-3640 PSU covers KS3, KS3L, KS3M, and the higher KS5L; the C19 power cord is shared across all four models
• Same chassis — the KS5M / KS5L / KS3M / KS3L miner case is a common form factor

The differentiator across KS3 models is the chip count per hashboard, which scales with the total miner hashrate. The KS3 (highest count) carries the most chips per board, the KS3L (lowest count) carries the fewest, and the KS3M sits in the middle. The diagnostic methodology and component inventory are identical across the three.

Note: The KS5L and KS5M use a different ASIC chip generation (1004LV100) and are not directly cross-compatible at the chip level with the KS3 family. The PSU, control board, fan, and chassis are shared, but the hashboard ASIC stock is separate. See our KS5L repair guide for the KS5 family components.

KS3M Hashboard Architecture at a Glance

The KS3M hashboard follows the same architectural pattern as the KS3 and KS3L variants:

• 28 voltage domains arranged in series, with the chip count per domain scaling to the model's total hashrate
• ASIC chip operating voltage: approximately 0.4V during single-board testing (chip domain voltage)
• Boost circuit at chip position U15 (MP1517DR): converts the 12V input to the elevated rail that supplies the top 5 voltage domains (domains 28, 27, 26, 25, 24) through their LDOs
• Lower domains (1-23) powering: the 2.2V input feeds the per-domain LDOs that output 1.8V
• 0.8V rail: derived from the local 1.8V via the SGM2036-ADJ LDO
• Per-chip voltage groups: each ASIC chip has three voltage references — domain voltage (~0.4V), VDDPST / VDDPLL1V8 (1.8V via MP2019 or SGM2036), and VDD0P8 / VDDPLL0V8 (0.8V via SGM2036)
• Signal routing: TX enters at IO pin 7 (3.3V), passes through level converter U8, then forward from chip 01 to the end of the chain (1.8V operating). RX flows in reverse from the end of the chain back to chip 01 through level converter U7. RSTN enters at IO pin 3, passes through level converter U6, then forward through the chain.
• Crystal oscillator: a 25 MHz crystal is shared between every two chip levels (0.9V normal at the oscillator output)

The chip pin voltage measurements must be referenced to the "ground" of the current chip's voltage domain, not to the digital GND (0V), because the KS3 series uses voltage-division power delivery.

Most Common KS3M Hashboard Failure Modes

• 0 ASIC chips detected on the test fixture — walk the power chain: 12V PSU output → MOS chip turn-on (T871 enable test point) → boost circuit output at TP872 (15.5V) and TP873 (22V) → per-domain LDO outputs (1.8V then 0.8V) → ASIC chip signal voltages.
• Specific chip count detected (chain stops at a specific position) — the chain is healthy up to that count and fails at the boundary chip. Use the DIR voltage method (see workflow below) to identify the failed chip.
• Hashboard not detected at all — usually a corrupted EEPROM or a failed clock from the T250 gold crystal oscillator.
• High or low temperature fault reported by the miner — failed TMP75 temperature sensor producing implausible readings. Check the sensor IC and the 3.3V supply.
• Boost stage failure / 0 chips with bad rail voltage at TP872 — failed MP1517DR boost converter at U15 drops the elevated rail. Verify Vin / Vout / Ven / Vfb on the MP1517DR (Ven = 0V and Vfb = 0.6V are normal).
• Single-domain dropout — failed LDO (SGM2036-ADJ (SQ7JK) for 0.8V or MP2019 for 1.8V) takes its local domain offline. Check the 1.8V and 0.8V at each chip pin against the current-domain ground reference.
• Signal-path level translation failure — failed SN74AUP1T34DCKR (U2E) on the TX / RX / RSTN level conversion path causes a block of downstream chips to drop offline simultaneously.
• Power-input protection failure — failed LMBR140T1G (S7) Schottky produces a short or open that disrupts the input rail.
• Current sense / shunt anomaly — degraded 1R00 SMD resistor in the current-sense network produces incorrect current readings that trip protection.

Critical Components — Function & Failure Behaviour

Iceriver ASIC Hash Engine (KS3 family chip)

The KS3M uses the same Iceriver proprietary ASIC chip family as the KS3 and KS3L (Iceriver internal silkscreen markings may vary across production runs; the chip itself is cross-compatible for repair stock across the three models). Each chip operates at approximately 0.4V domain voltage during single-board testing. ESD damage during handling and sustained thermal stress from dried thermal compound are the most common failure causes.

Boost Converter (MP1517DR at U15)

The MP1517DR QFN-16 adjustable positive switching regulator at position U15 converts the 12V input to the elevated rail (typically 15.5V or 17V depending on the model) that supplies the top 5 voltage domains. A failed MP1517DR drops the upper-domain rail and presents as 0 chips detected. Verify Vin / Vout / Ven / Vfb at U15 — Ven = 0V and Vfb = 0.6V are normal operating values.

Voltage Regulators (LDOs)

The KS3M uses the SGM2036-ADJ (SQ7JK) for the 0.8V chip core rail (VDD0P8 / VDDPLL0V8) and the MP2019 (SOP-8) for the 1.8V rail (VDDPST / VDDPLL1V8). A failed LDO takes its local chip group offline — measure both rails at each chip pin against the current-domain ground reference (not against digital GND).

Level Translators (U6 / U7 / U8)

The SN74AUP1T34DCKR (U2E) level translators handle TX (at U8), RX (at U7), and RSTN (at U6) signal conversion between the 3.3V control side and the 1.8V chip-side logic. A failed translator typically causes a block of downstream chips to drop offline at once — a useful diagnostic signature when scanning with the test fixture.

Temperature Sensor (TMP75)

The TMP75 digital temperature sensor monitors hashboard temperature. A failed sensor produces missing or implausible readings.

Crystal Oscillator (T250 Gold)

The T250 Gold Crystal Oscillator provides the 25 MHz timing reference, shared between every two chip levels. Normal voltage at the oscillator output is approximately 0.9V. A failed oscillator prevents chain initialisation entirely.

Protection & Storage

The LMBR140T1G (S7) Schottky diode handles freewheeling and reverse-polarity protection on the power-input stage. The G337 2V tantalum capacitor handles bulk decoupling on the chip rail, and the 10µH HPC1050 inductor handles boost-stage energy storage.

Passive Components

The 330µF 35V SMD (10×10.5mm) and 47µF 63V SMD (8×10.5mm) electrolytic capacitors handle bulk decoupling on the power-delivery stage. The 1R00 SMD resistor serves as a current-sense / shunt element.

Iceriver KS3M Hashboard Repair Components List

The table below lists every component LYS Shenzhen stocks for KS3M hashboard repair. Each entry links directly to the corresponding part page — contact us at contact@lys-sz.com for the Iceriver KS3-family ASIC chip, the 1R00 SMD resistor, or for bulk farm-scale orders.

Required Repair Tools & Consumables

• Iceriver KS test fixture — the dedicated KS-series hashboard test fixture is required for chip-level fault isolation on the KS3M (the same fixture family typically covers KS3 / KS3L / KS3M).
• Iceriver KS3M / KS3L tin tool (P2SG48 stencil) — dedicated reballing stencil for the KS3-family chip footprint.
• Iceriver 4-pin fan simulator (KS3 / KS5L) — allows the miner control board to start without physical fans during bench testing.
• Regulated bench PSU: 12V fixed voltage, current limit at 2A for KS3L-class boards (KS3M should be tested at the appropriate current limit per model spec). Bench power-up current at first power = ~0.1A (control board only), rises to ~0.9A on enable, then to ~1.8A during full chain test.
• Constant-temperature soldering iron at 350-400°C for SMT work.
• Hot-air rework station rated 350-400°C for chip removal.
• Solder paste M705 grade, no-clean flux, board washing fluid with anhydrous alcohol.
• Multimeter (Fluke recommended), tweezers, electric screwdriver, short-circuit probe wire.
• High-temperature adhesive tape — protect electrolytic capacitors and LEDs during nearby rework.
• Thermal compound rated 5W/mK or higher for heatsink interface.
• Quick-drying three-proof paint for both sides of the LDO chips after repair.
• Common spare 0402 resistors (0R, 10K) and 0402 capacitors (1µF), plus 0603 resistors (33R) and 0603 capacitors (1µF / 22µF).

Diagnostic and Repair Workflow — KS3M-Specific

The KS3M repair workflow uses the dedicated Iceriver KS test fixture. Always observe the correct power-on / power-off sequence to avoid damaging level translators and ASICs.

Power-on sequence (mandatory)

1. Negative power lead (black) first — connect to the inside power terminal (close to the plastic socket interface).
2. Positive power lead (red) — connect to the outside power terminal.
3. Data cable last — plug into the outermost interface on the hashboard.
4. To disconnect, reverse the order: data cable first, then positive, then negative.

Wrong order risks burning U2 / U3 / U4 / U5 / U18 / U15 on the hashboard — these are the first components powered when the control board comes up.

Diagnostic sequence

1. Disassemble the miner and remove the suspect hashboard. Never work on a powered board.
2. Visual inspection — look for scorched components, lifted pads, PCB deformation, or impact damage.
3. Impedance / short-circuit check on every voltage domain before powering. Any rail short must be cleared before applying power.
4. Connect the regulated bench PSU at 12V with the appropriate current limit. Apply power following the negative-then-positive-then-data sequence above.
5. Initial current check: at power-on, only ~0.1A should flow (control board only powered). Higher means short circuit in the powered components (U2, U3, U4, U5, U18, U15).
6. Connect the KS test fixture and run the single-board test program. Current rises to ~0.9A on enable, then to ~1.8A during the chain test.
7. If the test reports 0 chips detected: walk the power chain — verify MOS turn-on (test point T871 enable voltage), boost circuit output at TP872 (15.5V) and TP873 (22V), then per-domain LDO outputs (1.8V then 0.8V), then ASIC chip signal voltages.
8. If the test reports a specific chip count: use the DIR voltage diagnostic — measure the DIR pin on the boundary chip. If DIR = 1.8V: use a short-circuit wire to pull the PS0 pin of the boundary chip up to 1.8V (only 1.8V — higher voltage will damage the chip). If DIR = 0V: pull the SP1 pin up to 1.8V instead. Re-run the test — if the chain still stops at the same position, the boundary chip is faulty; replace it. If the chain now stops one position later, move to the next chip and repeat the DIR / pull-up procedure.
9. For high or low temperature fault: check the TMP75 sensor IC, its 3.3V supply, and the surrounding passive components.
10. For chip replacement: use the KS3M / KS3L tin tool (P2SG48 stencil) to pre-tin the chip pads with M705 paste before placing the new chip. Protect nearby electrolytic capacitors and LEDs with high-temperature adhesive tape during rework.
11. Re-test on the fixture — when the chip count matches the actual number on the board, voltages and temperatures are normal, and "three successes" pop up, the repair is verified.
12. Re-paste the heatsink with 5W/mK or higher thermal compound, ensuring the paste covers the centre of each chip accurately. Spray three-proof coating on both sides of the LDO chips before final reassembly.
13. Reassemble the miner, install all 3 hashboards (KS3M uses 3 hashboards per chassis), connect the conductive copper strips to the PSU with correct polarity (yellow positive, black negative), torque to spec, and run the standard aging soak test under load.

When Chip-Level Repair Makes More Sense Than Board Replacement

A complete KS3M hashboard replacement is often constrained in supply on the Iceriver platform. For repair shops processing more than a few KS3 / KS3L / KS3M boards a month, a small inventory of the Iceriver KS3-family ASIC chip, the MP1517DR boost converter, the SGM2036-ADJ and MP2019 LDOs, the SN74AUP1T34DCKR level translator, the TMP75 sensor, the T250 oscillator, and the LMBR140T1G Schottky covers the majority of bench-repair scenarios across all three KS3 models. The KS3M / KS3L tin tool (P2SG48 stencil) is mandatory for clean chip reflow.

Compatible PSU and Control Board

The Iceriver KS3M is supported by the BP-H-3640 PSU (shared across KS3, KS3L, KS3M, and KS5L). LYS Shenzhen stocks the Iceriver KS-series control board (compatible across KS3L / KS5L / KS5M and other KS variants), the 4-pin fan speed simulator, plus the C19 power cord and the 120mm cooling fan shared across the entire KS family. The miner chassis is the same form factor across KS5M / KS5L / KS3M / KS3L.

FAQ — Iceriver KS3M Hashboard Repair

Does the KS3M use the same ASIC chip as the KS3 and KS3L?

Yes. The KS3, KS3L, and KS3M all use the same Iceriver KS3-family ASIC chip — a single chip inventory covers repair needs across all three models. The difference between the models is chip count per hashboard (which scales with total hashrate), not chip type. Note that the KS5L and KS5M use a different chip generation (1004LV100) and are not cross-compatible at the chip level with the KS3 family.

What is the correct power-on sequence for a KS3M hashboard on the bench?

Connect the negative power lead (black) to the inside terminal first, then the positive lead (red) to the outside terminal, and finally plug in the data cable to the outermost interface. Reverse the sequence to disconnect. Wrong order can damage U2, U3, U4, U5, U18, and U15 on the hashboard, which are the first components powered when the control board comes up.

What does the DIR voltage method do?

When the test fixture reports a specific chip count (not 0 and not the full count), the chain is healthy up to the boundary chip and fails at the next position. Measure the DIR pin on the boundary chip: if DIR = 1.8V, pull the PS0 pin up to 1.8V with a short-circuit wire; if DIR = 0V, pull the SP1 pin up to 1.8V. Re-run the test — if the chain still stops at the same position, the boundary chip is faulty and needs replacement. The pull-up voltage must be exactly 1.8V; higher will damage the chip.

What PSU and accessories does the KS3M share with other Iceriver models?

The BP-H-3640 PSU covers KS3, KS3L, KS3M, and KS5L. The C19 power cord, the 120mm cooling fan, and the chassis are also shared across these models plus the KS5M. The control board is shared across KS3L / KS5L / KS5M. This means a single set of common accessories covers most of the Iceriver KS lineup repair stock.

What thermal compound should I use on a KS3M hashboard?

Use thermal compound rated 5W/mK or higher. Apply the paste accurately on the centre area of each chip; an off-centre application produces uneven heat transfer that triggers thermal throttling. After repair, spray three-proof coating on both sides of the LDO chips before final assembly for vibration resistance and contamination protection.

Sourcing KS3M Hashboard Parts

LYS Shenzhen stocks most components listed above for the Iceriver KS3M hashboard. For the Iceriver KS3-family ASIC chip (cross-compatible with KS3 and KS3L), the 1R00 SMD resistor, the KS3M / KS3L tin tool, the test fixture, or for bulk farm-scale orders across the Iceriver KS family (KS0 / KS1 / KS2 / KS3 / KS3L / KS3M / KS5L / KS5M), contact our team at contact@lys-sz.com — we operate an on-demand sourcing channel for repair components across the full Iceriver KAS mining lineup.

Worldwide shipping from our Shenzhen warehouse via DHL, FedEx, UPS, and sea freight. DDP shipping available for US and EU customers; case-by-case for other lanes — request a quote with your shipping country for confirmation.