Disassemble
SMD ICs have many pins and are closely arranged, and some have pins on all four sides. If the method is not appropriate when disassembling, they cannot be removed if they are light, and the pins of the integrated circuit and the copper foil on the circuit board will be damaged. The disassembly of chip integrated circuits usually uses a hot air desoldering station or a hot air gun.
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Before disassembling, carefully observe the position and orientation of the integrated circuit to be removed on the circuit board, and make a mark so that the integrated circuit is installed according to the corresponding mark when soldering to avoid installation errors.
Use a small brush to clean the impurities around the chip integrated circuit, and then apply a little rosin powder or rosin to the chip integrated circuit pins.
Adjust the temperature and wind speed of the heat gun. The temperature switch is generally adjusted to 3 to 5 gears, and the wind speed switch is adjusted to 2 to 3 gears.
When disassembling with a single nozzle, pay attention to keep the nozzle and the integrated circuit vertical, and move along the pins around the integrated circuit to heat each pin evenly. The nozzle should not touch the integrated circuit and surrounding peripheral components. Accurate, and can not blow to the components around the integrated circuit.
After the solder of each pin of the integrated circuit is completely melted, use tweezers to lift or clip the integrated circuit without force, otherwise it is easy to damage the copper foil connected to the integrated circuit.
For those who do not have hot air desoldering station or hot air gun maintenance personnel, the following methods can be used to disassemble the chip integrated circuit:
First apply rosin to a row of pins of the integrated circuit, and use solder to connect all the pins of the row, then heat the solder with an electric soldering iron. After the solder on the row of pins melts, use a thin blade (such as a shaving blade) ) push between the circuit board and the pins, remove the soldering iron, wait a few seconds, and then take out the blade, so that the pin of the IC is separated from the circuit board, and then use the same method to remove the other pins of the IC Separated from the circuit board, the entire integrated circuit can be removed in the end.
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