How to change control board for N40630/A40640

Tips:

Welding requires some skills. I suggest you take a look at the following video: Link

First, disassemble your laser drive

Add enough solder to make all 4 pins have solder, as shown in the figure below:

Heat the four points at the same time, and gently lift the control board with your left hand. If the method is correct, you can quickly separate the drive board and the main body

When you successfully remove the driver board, a lot of solder may remain on the pins. You need to clean them.

Tips:

When you have difficulty removing solder, it should be because your solder loses its activity due to too long heating time. At this time, you should add new solder to restore its activity (there is flux in the new solder). This is a common phenomenon. When you heat solder for too long, the solder will become very difficult to deal with, such as welding, Try adding new solder to restore the state.

trying to tilt the pin down will help remove solder.

This is the ideal state after removing solder

Put on new control board:

Welding new drives:

Tips:

Please do not put the solder wire on the soldering iron and then contact the pin, which will make the solder inactive. Try to contact the solder wire with the pin, and then let the soldering iron contact the pin and the solder wire.
See this link for welding tips.

This is a video show how to change control board for N40630/A40640:

9 thoughts on “How to change control board for N40630/A40640”

  1. Kirill Zuev

    Hello,

    Do you have photos of the back side of PCB? I accidentally connected a 24v power supply instead of 12v one. One SMD component completely burned and I want to replace it but it is destroyed beyond any chance to read the marking.

    Thank you!

  2. Hello I need help. I made a mistake and disconnected the laser driver from the diode housing. Do you have a diagram where I can see how to reconnect it? My laser is Neje 30w

  3. I made a mistake and disconnected the laser driver from the diode housing. Do you have a diagram where I can see how to reconnect it? My laser is Neje 30w

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