Whatsminer M50 Hashboard Repair Guide

Step 1: Disassembly

Whatsminer disassembly differs from Antminer:

1. Power off and disconnect AC cord. Wait 60 seconds.
2. Remove the fan assembly — typically held by Torx screws
3. Disconnect the control board cables from each hashboard
4. Remove the hashboard retaining screws (check for both Phillips and Torx)
5. Slide the hashboard out — Whatsminer boards may be tighter-fitting than Antminer

Step 2: Visual Inspection

Inspect the hashboard for:

• Burnt or discolored voltage regulator areas
• Cracked BGA solder joints (under magnification)
• Connector damage (both hashboard and control board side)
• Corrosion or coolant residue (if previously in immersion)
• Physical PCB damage (cracks, delamination)
• Heatsink contact issues (thermal paste condition)

M50-specific inspection:

• Check the wider hashboard connector for pin alignment
• Inspect the temperature sensor connections (NTC wiring vs digital IC)
• Look for any conformal coating damage (some M50 boards have protective coating)

Step 3: Voltage Domain Testing

Resistance Check (Power Off): Each domain should read 2–10Ω. Near 0Ω = shorted component.

Powered Voltage Measurement:

M50-specific notes:

• Whatsminer domain voltages may vary slightly more across domains than Antminer boards
• Use the WhatsMiner Tool's diagnostic mode to read per-domain voltage through software

Step 4: Signal Chain Testing

The chip daisy chain on Whatsminer uses MicroBT's proprietary protocol:

1. Use binary search method at the chain midpoint
2. CLK and data signal levels are at 1.8V (similar to Bitmain)
3. Continuity testing of the chain works the same way

WhatsMiner Tool diagnostics: The WhatsMiner Tool software provides software-based chain testing:

1. Connect to the miner's IP address
2. Run the diagnostic scan
3. The tool reports which chips are detected and where the chain breaks
4. This can sometimes replace manual probing for initial diagnosis

Step 5: Component-Level Diagnosis and Chip Replacement

Chip testing: Identical diode-mode testing applies — healthy chips show 0.3–0.6V, shorted show near 0V.

Chip replacement: MicroBT ASIC chips use BGA packages:

1. Apply flux → preheat 150°C → hot air 350–380°C → remove chip
2. Clean pads → apply flux → place new chip → reflow
3. Cool → clean → inspect

Sourcing MicroBT chips: Unlike Bitmain chips which are widely available, MicroBT replacement chips can be harder to source. Options:

• Purchase from MicroBT-authorized suppliers
• Harvest from donor boards (same model)
• Contact MicroBT support for replacement parts

Step 6: Verification with WhatsMiner Tool

1. Reinstall the hashboard in the enclosure
2. Reconnect all cables
3. Power on and connect WhatsMiner Tool:

# WhatsMiner Tool verification
1. Open WhatsMiner Tool on your computer
2. Scan for miners on your network (or enter IP directly)
3. Connect to the M50
4. Navigate to Status → Hash Board
5. Verify:
   - All chips detected
   - Per-chip hashrate within normal range
   - Temperature readings normal
   - No error codes

SSH diagnostics (alternative):

ssh root@<miner-ip>
# Whatsminer uses btminer instead of cgminer
cat /tmp/btminer.log | tail -50
# Check chip status
cat /tmp/chip_status

4. 24-hour burn-in for stability confirmation