CB4 V10 Control Board Basic Repair Guide

Note: CB4 V10 is an H6OS control board suitable for the WhatsMiner M20 M21 M30 M31 M32.

Step 1:Appearance Inspection

1. Check whether the component is falling from the control board's front and back. In case of physical damage, such as connector, inductance, and capacitance, replace the corresponding devices first.

2. Check whether there has a burnt-out chip issue. If it is burnt out, replace the corresponding chip first.

3. Check whether there is dust on the top and back sides of the control board. If there is dust, clean it with a circuit board cleaning solution or alcohol first.

Normal control board appearance as below:

top side of control board.jpg 

Pic 1 Top side of control board

back side of control board.jpg Pic 2 Back side of control board

Common component burnt issue as below: Top A-U3, Top B-U2, Back C:

top side A、B.jpg

Pic 3 Top side A、B

back side C location.jpg Pic 4 Back side C location

Step 2:Short circuit check and repair without power

1. Switch the multi-meter to the buzzer level and test whether there has a short circuit on the A / B / C / D / E / F / G location as below.

test point after removing the inductance.jpg Pic 5 Test location as an arrow point

2. If there is a short circuit on A of Pic 5, it means U3 is most probably damaged; replace the U3 directly to repair, then test whether the short circuit issue is still there.

3. If there has a short circuit on B of Pic 5, there have 3 probables as below:

1st: U3 damage:

Remove the U3 and test whether the short circuit issue is still on B of pic 5; if no short, it means U3 is damaged; replace U3 directly to repair.

2nd: U2 damage

Remove the U2 and test whether the short circuit issue is still on B of pic 5; if there is no short issue, then it means U2 is damaged; replace U2 directly to repair.

3rd: U5 damage

Remove the U5 and test again to determine whether the short circuit issue is still on B of pic 5; if there is no short, it means U5 is damaged; replace U5 directly to repair.

4. If there has a short circuit on C of Pic 5, there have 2 probables as below:

1st: U5 damage:

Remove L2, test I of Pic 6; if the short issue is still there, it means U5 is damaged; replace U5 to repair it directly.

2nd: U1 damage:

Remove L2 and test H of Pic 6; if the short issue is still there, it means U1 is damaged; replace U1 to repair it directly.  

5. If there is a short circuit at the D terminal in Pic 5, there are 2 possibilities as below:

1st: U5 damage:

Remove L3 and test J in Pic 6. If there is still a short problem, U5 is damaged. Replace U5 and repair it directly.

2ed: U1 damage:

Remove L3 and test K in Pic 6. If there is still a short problem, U1 is damaged. Replace U1 and repair it directly.

6. If there is a short circuit in E in Pic 5, there are 2 possibilities as below:

1st: U5 damaged:

Remove L4 and test L in Pic 6. If the problem is still short, U5 is damaged. Replace U5 and repair it directly.

2nd: U1 damaged:

Remove L4 and test M in Pic 6. If there is still a short problem, U1 is damaged. Replace U1 and repair it directly.

7. If F in Pic 5 has a short circuit, there are 2 possibilities as below:

1st: U5 damaged:

Remove L1 and test O in Pic 6. If there is still a short problem, U5 is damaged. Replace U5 and repair it directly.

2nd: U1 damaged

Remove L1 and test N in Pic 6. If there is still a short problem, U1 is damaged. Replace U1 and repair it directly.

8. If there has a short circuit on G of Pic 5, there have probably as below:

Remove L2, test G of Pic 5; if the short issue is still there, then it means U1 is damaged, replace U1 to repair it directly. If not short anymore, it means U2 is damaged, replace U2 to repair it.

test point after removing the inductance.jpg Pic 6 Test point after removing the inductance

Step 3:No short issue found on the above test, do test with power to further check and repair

1. After power on, test G of pic 5; if it’s not 1.8V (float more than 5%), the common value shows 0, 3.4V, 5V, etc. Then it means U2 has an issue and needs to replace U2 to repair.

2. If it’s 1.8V, flash the new program to check whether the board will work normally.

Above all, those are common issues that most probably happen for repair; if the board can’t be repaired by the above method, then it needs to be sent to the repair center.

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