The replacement method means that when it is suspected that the integrated circuit may be damaged, it is directly replaced with an integrated circuit of the same model. If the fault disappears, the original integrated circuit is damaged. If the fault remains, it may be that the peripheral components of the integrated circuit are damaged or replaced. If the integrated circuit is defective, the replacement of the integrated circuit may be damaged due to failure of the peripheral components. Some integrated circuits may not receive the control signals from other circuits.
The main points of the substitution method are as follows: because directly replacing the integrated circuit when the failure of the peripheral components is not ruled out, the integrated circuit may be damaged again. Therefore, for the integrated circuit operating under high voltage and high current, it is best to check the normality of the peripheral components Replace the integrated circuit only in the case of low-voltage, and try to replace the integrated circuit when it is determined that the peripheral components of some key pins are normal.
Some digital integrated circuits contain programs. If an error occurs in the program, even if the peripheral components and related control signals of the integrated circuit are normal, the integrated circuit will not work properly. In this case, some equipment can be used to rewrite the program to the integrated circuit, or Replace the integrated circuit that has been written into the program.
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Disassembly of in-line integrated circuits
When overhauling the circuit, it is often necessary to remove the integrated circuit from the printed circuit board. Because there are many pins in the integrated circuit, it is difficult to disassemble. Improper disassembly may damage the integrated circuit and the circuit board. The following introduces several common methods of disassembling integrated circuits.
Disassembly with syringe needle
When disassembling the integrated circuit, it can be disassembled with the help of a stainless steel hollow core sleeve or a syringe needle (available in the electronic market). The disassembly method uses a soldering iron tip to contact a certain pin solder of the integrated circuit. When the pin solder of the pin is soldered After melting, put the syringe needle of appropriate size on this pin and rotate it to make the pin of the integrated circuit separate from the solder copper foil of the printed circuit board, then remove the soldering iron head, and then pull out the syringe needle, so that the integrated circuit One of the pins is separated from the copper foil of the printed circuit board, and then the other pins of the integrated circuit are detached from the copper foil of the circuit board in the same way, and finally the integrated circuit can be unplugged from the circuit board.
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