PCB Technical - PCB copy skills: 5 ways to disassemble integrated circuits

In the process of PCB copying, because the circuit board needs to be split, the integrated circuit and other components are removed to make a BOM list, and the split PCB bare board is scanned and copied. Therefore, in this process The correct removal of integrated circuits on PCB circuit boards is also an important issue.

Not only in the process of PCB copying, but also when the circuit board is overhauled, it is often necessary to disassemble the integrated circuit from the printed circuit board. However, due to the many and dense pins of the integrated circuit, it is difficult to disassemble and sometimes damages the integrated circuit and the circuit. plate. Here, we provide several effective methods for accurately disassembling integrated circuits, hoping to help everyone.

Method one: the method of disassembling the tin suction device

Use a solder sucker to disassemble the integrated block. This is a common professional method. The tool used is an ordinary electric soldering iron with a power of 35W or more. When disassembling the integrated block, just put the heated dual-purpose electric soldering iron tip on the pin of the integrated block to be disassembled, and the solder joint will be sucked into the thin tin device after the solder is melted.

After the solder of all pins is sucked, the integrated block will be Can be removed.

Method 2: Medical hollow needle removal method

Take a few medical hollow needles of 8 to 12 gauge. When using, the inner warp of the needle should just cover the pins of the integrated block. When disassembling, use a soldering iron to melt the solder of the pins, put the pin head on the pin in time, then remove the soldering iron and rotate the pin head, and then pull out the pin head after the solder solidifies. In this way, the pin is completely separated from the PCB circuit board. After doing this for all pins, the integrated block can be easily removed.

Method three: disassembly method with electric soldering iron brush

The method is simple and easy to implement, as long as there is an electric soldering iron and a small brush. When disassembling the integrated block, heat the electric soldering iron first. After the solder on the pins is melted by the melting temperature, take the opportunity to wipe off the melted solder with a brush. In this way, the pins of the integrated block can be separated from the printed circuit board. This method can be carried out separately or separately. Finally, use sharp tweezers or a small "one" screwdriver to pry off the integrated block.

Method four: add solder melting and disassembly method

This method is a labor-saving method, as long as some solder is added to the pins of the integrated block to be disassembled, so that the solder joints of each column of pins are connected, so as to facilitate heat transfer and facilitate disassembly. When disassembling, use an electric soldering iron to heat each column of pins with a sharp tweezers or a small "one" screwdriver to pry, and the two columns of pins are heated alternately until they are removed. Generally, each column of pins can be removed by heating them twice.

Method 5: Multi-strand copper wire suction and disassembly method

Use multiple strands of copper core plastic wire to remove the plastic sheath, and use multiple strands of copper core wire (short wire ends can be used). Before use, put the rosin alcohol solution on the multiple copper core wires. After the electric soldering iron is heated, put the multiple copper core wires on the pins of the integrated block and heat them, so that the solder on the pins will be absorbed by the copper wires. The solder part of the upper PCB can be cut off, and the solder on the pins can be sucked away by repeating this process several times. Conditional PCB factories can also use the braided wire in the shielded wire. As long as the solder is sucked up, use tweezers or a small "one" screwdriver to gently pry, and the integrated block can be removed.