howard

Computer is indispensable in our daily life, and with the development of the times, the frequency of computer applications is also increasing. Nowadays, there are relatively more computer brands, and the corresponding products are also very good, but there are individual problems. For example, what about the loud sound of the LCD monitor? Like this problem can be said to be a relatively common problem, the following author will detail the relevant information and solutions.

We are the lcd manufacturers for small size displays such as 1.8inch 128x160, 2.0inch 176x220, 2.0inch 240x320 IPS, 2.8inch 240x320, 3.5inch 320x240 and 3.5inch 320x480 IPS ect.

When we find that the LCD monitor has some loud sound, in fact, you can summarize exactly where it is generated. For example, the switching power supply squeak, there are two general causes of failure: one is the +310V filter capacitor loss of capacity, the other case is the display is in a state of protection work. When we hear the switching power supply squeak, it means that the power supply starts the display circuit, as well as the positive feedback circuit and the protection circuit itself are normal. When the power supply is not stable, and the corresponding load is too heavy, as well as the power supply in the protection of the working state of the case will appear loud.

Solution. Observe whether the +310V filter capacitor (such as C905) is different, or measure its voltage is normal. If this capacitor has poor contact or is damaged, it should be re-soldered or replaced. When we find that the +310V capacitor is normal, the following we need to check the corresponding load, but also need to check the corresponding capacitor C922 and C925 positive to ground resistance value, once found that the resistance value is too small, it means that the load will have a short-circuit problem; then we need to unplug the power supply output to re-measure. If the resistance value is back to normal, it means the load will be faulty. When we check the processing board, once we find that it is not normal, then it means that the rectifier and filter components have problems, we need to check or replace the corresponding rectifier tube and filter capacitor failure. When we find no problems with the load, we can check the corresponding voltage regulator control circuit to see if there is a fault.

After the above simple introduction, I believe that we have a good way to deal with these problems for the LCD monitor loud sound. In fact, in simple terms, for this type of LCD monitor, the problem of strange sound is still relatively common. But when we find such a problem, we also need to carry out a step-by-step analysis to confirm where the problem arises, in order to continue to solve.