test voltage method

1. Measuring voltage is also one of the basic methods of maintaining the display, which is often used in practice. It mainly measures the working voltage of circuits and components, so as to determine the fault location and components. The measurement voltage is divided into AC voltage and DC voltage. AC voltage is to use the AC voltage value of the multimeter to measure the AC voltage value of the display power supply. Check its AC voltage with a multimeter, and then compare it with the measured value under normal conditions to judge whether the circuit works normally.

Observation

2. 1. It is to directly observe whether the components are burnt, damaged, deformed, discolored, broken, and whether the filament of the picture tube is lit after the current is turned on. These problems are often the fault or are closely related to the fault. Find these problems, you can quickly Identify the problem and fix the industrial display

Fourth, the resistance method

1. Measuring resistance is also one of the basic methods of maintaining the display. It is mainly divided into two kinds of measurements: one is to measure the resistance value to ground of the display circuit and components, and the other is to measure the resistance value of the components themselves. Measure the resistance to ground at the output end of the circuit to determine whether the load of the circuit is normal. For example, when measuring the ground resistance value of the output terminal of the regulated power supply, if the load resistance changes greatly, the ground resistance of the output terminal of the regulated power supply will inevitably change greatly, which makes it easy to determine the fault. When measuring the ground resistance value of each pin of a transistor or integrated circuit block, it is necessary to measure its forward and reverse resistance. Usually, the resistance value measured when the negative test lead is grounded is the positive resistance, and the resistance value measured when the positive test lead is grounded The obtained resistance value is of course the reverse resistance. This can be compared with the resistance value under normal conditions according to the change of the measured resistance value, and the fault can be judged.

2. When the specific part of the fault cannot be clearly judged, the transistor or integrated circuit block can be removed, and the forward and reverse resistance values between the pins of the transistor and the forward and reverse resistance values between the feet of the integrated circuit block and the grounding pin can be measured. , can also roughly judge the quality of transistors or integrated circuit blocks.

Five, percussion method

1. This is also one of the most effective ways to repair the display, especially for the faults caused by virtual welding and poor contact. The method is: use an insulator, such as a wooden stick, to lightly tap and press the parts that may have problems with or without power, and it is easier to find faults such as virtual welding and poor contact. .

If the problem has not been solved, communicate with the manufacturer in time or ask professional maintenance personnel to complete all the maintenance work. Do not squeeze the industrial touch display with force. Damage to the screen/touch screen.