IceRiver KS Miner Won’t Turn On / No LED Lights

Verify the wall outlet first. Plug a known-good lamp or another miner into the same outlet to confirm AC is present. If the lamp does not light, you have a breaker, GFCI, or outlet problem - reset the breaker, reset the GFCI, try a different circuit. Do not skip this; we routinely see 'dead miners' arrive at the bench because someone's home-office GFCI tripped during a vacuum-cleaner pass and never got reset.

Swap the kettle cord. C13 on KS0/KS1/KS2 or C19 on KS3/KS5/KS6 (high-current single phase). A subtly damaged cord can pass continuity at rest and fail under load. Try a known-good cord from another miner or a fresh OEM cord. Inspect both ends of the cord for melting, discolouration, or carbon at the contact points - early warning of the documented IceRiver plug-melt failure mode.

Try a different outlet on a different breaker. Some homes have flaky neutrals or shared circuits. Move to a known-good high-current outlet (240 V dedicated for KS3/KS5/KS6, 120 V 15/20 A for KS0/KS1/KS2). If the miner powers up on a different outlet, your circuit is the problem, not the miner - and you should not return that miner to the original outlet without an electrician's review.

Listen at the PSU on plug-in. Healthy IceRiver PSU = soft click within 1 second of AC application (the standby relay closing). No click ever = AC fuse open or primary-side dead. One click then silence = main converter shutting down on overcurrent, almost always a controller or hashboard short. This single observation tells you whether you are in Tier 2 (fuse) or Tier 3 (component) territory before you even open the case.

Open the chassis safely. Unplug AC. Wait 5 minutes for the PSU bulk caps to bleed (or short them through a 1 kohm resistor if you know what you are doing). Remove the chassis cover per IceRiver's service procedure for your KS variant - Phillips and Torx mix depending on model. Work on a non-conductive surface and use ESD precautions; the controller has exposed regulators that do not appreciate a stray screwdriver.

Visually inspect everything before powering anything up again. Look for: bulged or domed caps on the PSU primary side, burnt MOSFETs, dark patches on the PCB, conductive dust between contacts, cracked solder joints on the controller power header, melted connectors. If you smell burnt component, locate the source before reapplying power - powering up after a burn event is the single most reliable way to spread the fault.

Locate and test the AC fuse. Glass or ceramic 5x20 mm fuse in a holder near the AC inlet on the PSU. Pull it, multimeter on continuity. Open = replace with identical rating from the silkscreen (typically 6.3 A 250 V slow-blow on KS0/KS1/KS2, 10-15 A 250 V on KS3/KS5/KS6). Never up-rate a fuse - that is how you turn a $2 repair into a $400 hashboard. If the new fuse pops immediately on plug-in, you have a primary-side short, PSU swap.

Locate and test the internal DC fuse on the controller. Most KS models have one - a discrete 5x20 mm blade or surface-mount fuse near the controller's power input header. Probe continuity. Open = replace with identical rating. If the new fuse blows immediately on plug-in, you have a downstream short on the controller (Tier 3). If it holds and the controller LEDs come up, you found and fixed it - but figure out why the original blew before you call it solved.

Probe the standby rail (`5V STBY`) on the controller with AC live. Insulated probes only. The standby test point or header location varies by model - KS3/KS5/KS6 expose it on the PCB silkscreen, KS0 routes it through a connector. Expect a stable 5.0 V plus or minus 0.25 V. Absent standby with AC at the inlet means the PSU primary side has failed (rectifier, control IC, opto, bulk cap) - PSU swap.

Probe the main DC rail at the controller power header. With the miner plugged in and attempting to boot, expect the model's nameplate rail (12 V universal on the controller side; hashboard rail varies, typically 13.0-13.5 V on most KS3/KS5/KS6 hashboards under no-load). Rail absent with `5V STBY` present = PSU main converter not enabling. Either controller `PS_ON` is dead (controller fault) or PSU secondary is broken. Disconnect controller, jumper `PS_ON` to ground per the PSU pinout, and retest.

PSU swap. Source a verified-good IceRiver KS PSU - model-specific, KS3 and KS5 use different units, do not cross-fit without confirming nameplate match. Disconnect the failed PSU, install the replacement, double-check polarity and connector orientation on the DC harness, and bench-test outside the chassis before closing it up. D-Central stocks IceRiver replacement PSUs for most variants - contact us for parts pricing and the BP-H-3640 spec where applicable.

Controller swap. If diagnostics confirmed a controller-side short and the PSU is healthy, replace the controller board. IceRiver controllers are model-family specific (KS0 series uses one family, KS3/KS5/KS6 another). Match the part number exactly. Re-flash firmware after swap via SD card or recovery procedure (see the IceRiver firmware-recovery page). Verify the controller boots, the web UI is reachable, and DHCP issues an IP before declaring the repair complete.

Reflow or replace the controller's input regulator. If you have isolated the short to a specific buck regulator on the controller PCB and you are comfortable with hot-air rework, replace the regulator IC plus its associated decoupling caps. Wrong heat profile cooks adjacent components; wrong replacement IC bricks the board. This is genuinely advanced work - if you are not certain on the part number, footprint, or thermal profile, ship to D-Central rather than risking a cascade.

Replace bulged caps on the PSU primary side. If the PSU has visibly bulged electrolytics but the rest of the PSU looks healthy, you can sometimes recover it with a cap swap (Nichicon, Rubycon, Chemi-Con; match voltage and capacitance, prefer 105 C parts over 85 C). Realistic recovery rate is around 50% - often there is secondary damage from the original failure that only shows up under load. Bench-test the rebuilt PSU under a dummy load before reinstalling.

Inspect and re-seat all internal harnesses. Chassis flex, vibration, and 18+ months of thermal cycling can crack solder on a connector or migrate a pin out of its housing. Re-seat every harness firmly, listen for the click on locking connectors, verify pin alignment under good light. A bent or backed-out pin in the PSU-to-controller harness is a silent failure mode that mimics a dead PSU.

Stop DIY and ship to D-Central if any of these are true: (a) the AC fuse blows again immediately on plug-in even with the controller fully disconnected, (b) you measure a hard short on the controller's 12 V input but cannot localise the failed component, (c) the miner went through a confirmed lightning or surge event (multi-component damage in series), or (d) you see or smell a burnt-component event - there is almost always collateral damage you cannot see, and powering up again spreads it.

What D-Central does at the bench: full PSU-and-controller-side diagnostic on a current-limited bench supply, isolated swap of the PSU and controller against known-good units to localise the fault, component-level rework on the controller (regulator, caps, fuse), PSU primary-side rebuild where economics support it, full bench burn-in at nameplate before return shipping. Turnaround typically 5-10 business days from arrival. We send a quote before opening anything beyond diagnostic.

Ship safely to D-Central. Power down, unplug, double-box with at least 5 cm of foam on every side, anti-static bag the controller if you ship it separately from the chassis, and include a note documenting: model and serial number, observed failure mode (no LEDs / one click / silent / etc.), what you have already tested (fuse continuity, standby rail, main rail with PS_ON jumper), and your contact info. We charge by the hour past diagnostic - your notes save you money.