Integrated Circuit Testing

Testing the integrated circuit is normal or not, we can adopt the following methods:

Logic analysis

The so-called logic analysis is to point to measure the integrated circuit of the input signal, and then measure integrated circuit output signal, if there is something abnormal, the integrated circuit must be damaged.

DC resistance comparison method

DC resistance comparison method is to compare the DC resistance of each pin with the normal integrated circuit to judge. We need to use the same multimeter and the same resistance gears to minimize measurement errors. DC resistance comparison can test different models and different structures integrated circuit, but it must be using the same type of normal integrated circuit as a reference.

Exclusive method

Exclusive method refers to in the maintenance of a certain part of the circuit (include integrated circuit), we can first detect the discrete device. If the discrete device is normal, the integrated circuit must have some problems. We should consider changing the integrated circuit.

This method does not need the reference data of the IC, and there’s no need to understand inner working principle. It is often used in the LCD maintenance.

DC voltage measurement method

DC voltage measurement method is the commonly used method used to test integrated circuits, which mainly measure the pins of integrated circuit to DC voltage values. We can judge the IC by comparing with the nominal value.

Integrated Circuit replacement

The internal of integrated circuit basically are all semiconductors; it integrated hundreds of transistors in a tiny volume device. Because of this, a lot of integrated circuit can be replaced by others, as long as they get the same features of the pins, working voltage and the pins voltage. This feature is very useful for some integrated circuit which can’t buy on the market or selling price is too high. In addition, the quality of integrated circuit is different in different producing areas, the imported products have the best quality, and domestic has poor products, so their price is also different.