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 in circuit maintenance, it is often necessary to disassemble the integrated circuit from the printed circuit board. 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 board. Here, we provide several effective methods for accurately disassembling integrated circuits.
Solder sucker disassembly method:
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 removed.
Medical hollow needle disassembly method:
Take a few medical hollow needles of 8-12 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 printed board. After doing this for all pins, the integrated block can be easily removed.
Electric soldering iron brush coordination disassembly method:
This 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. Finally, use sharp tweezers or a small “one” screwdriver to pry off the integrated block.
Adding solder melting and disassembly method:
This method is a time-saving method. Just add some solder to the pins of the integrated block to be disassembled to connect the solder joints of each column of pins, so as to facilitate heat transfer and facilitate disassembly. When disassembling, use an electric soldering iron to heat each row of pins with a sharp tweezers or a small “one” screwdriver to pry, and the two rows of pins are heated alternately until they are removed. Under normal circumstances, each column of pins can be removed by heating them twice.
Multi-strand copper wire suction tin removal method:
Use multi-strand copper core plastic wire to remove the plastic sheath, and use multi-strand 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 upper part of the solder can be cut off, and the solder on the pins can be completely sucked away by repeating it several times. The braided wire in the shielded wire can also be used if possible. 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.
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