During 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 damage the integrated circuit and the circuit board.
Disassembly method of electric soldering iron brush
The method is simple and easy, 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.
Removal of razor blades
There are some patch components and patch integrated blocks that can be disassembled by this method. Generally, the integrated blocks of the patch are densely packed with many pins. Most people are afraid to disassemble it when they see it. This trick is me and Cao Zhengfang The classmates learned from Ensim Electronics Co., Ltd., first tin the integrated block pins (with rosin, add the right amount), and then the blade can be pushed from the bottom, wait a few seconds before taking it out. In this way, the integrated block is separated from the circuit board, but what should I do if there is so much tin remaining on the integrated block? Clamp the integrated block with tweezers, then add tin, the more the better, and use the electric soldering paste to drag it off a little bit. It's clean.
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, cover the pins with the needle in time, then remove the soldering iron and rotate the needle, and then pull out the needle 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.
Multi-strand copper wire suction disassembly method
It is to 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 to heat, 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. Conditions 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.
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 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. Generally, each column of pins can be removed by heating them twice.
How to disassemble 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 after the solder joint tin melts, it will be sucked into the thin tin device. After the solder of all the pins is sucked, the integrated block will be Can be removed.