The following methods can be used to detect whether the integrated circuit is normal:
(1) Logical analysis
The so-called logical analysis method means that if there is a problem with an integrated circuit, you can first measure whether the input signal of the integrated circuit is normal, and then measure whether the output signal of the integrated circuit is normal. If there is an input but no output, the integrated circuit is generally damaged.
(2) DC resistance comparison method
The DC resistance comparison method is to compare the DC resistance value of each pin of the integrated circuit to the normal integrated circuit, so as to judge the quality of the integrated circuit. The measurement should use the same multimeter and the same resistance gear to reduce the measurement error. Dc resistance comparison method can detect different models and different structures of integrated circuits, but the same type of normal integrated circuits as a reference.
(3) Elimination method
The elimination method means that if a certain part of the circuit (including an integrated circuit) is faulty during maintenance, the discrete components of this part of the circuit can be detected first. If normal, it indicates that the integrated circuit has a problem and should be replaced.
This method does not require reference information of integrated circuits, and does not need to understand the internal working principle, and is often used in color TV maintenance.
(4) DC voltage measurement method
Dc voltage measurement method is a common method to detect integrated circuits, mainly to measure the DC working voltage value of each pin to the ground of the integrated circuit, and then compared with the nominal value, so as to judge the quality of the integrated circuit.