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Many TV sets suddenly malfunction when they are watching. Sometimes it will recover soon, sometimes it will be a little shock. This kind of failure is often said to be poor contact.
Poor contact can be divided into two categories, one is contact element (such as potentiometer) contact oxidation or wear; the other is virtual welding, including solder joints are not welded, or solder joints are high-power components, When the current is large, the solder aging causes the solder joint to crack and malfunction. Most of the faults with poor contact belong to the latter category. In the actual maintenance, a set of simple and quick methods for finding the virtual solder joints is summarized and introduced to everyone for reference. There is a slight blackening crack around the foot of the solder joint component. The crack becomes more and more obvious with the frequent occurrence of the fault. The heavy component can be loose, and the light is like a welded stone. The crack indicates that the solder joint has overheated and melted, and it will be delayed sooner or later. My approach is to carefully check all the black-spotted solder joints, especially the high-power devices, regardless of the fault, and find that the cracked solder joints are soldered. This step is familiar with the solder joint crack characteristics. Ten minutes is enough, and you can often get twice the result with half the effort.
Poor contact can be divided into two categories, one is contact element (such as potentiometer) contact oxidation or wear; the other is virtual welding, including solder joints are not welded, or solder joints are high-power components, When the current is large, the solder aging causes the solder joint to crack and malfunction. Most of the faults with poor contact belong to the latter category. In the actual maintenance, a set of simple and quick methods for finding the virtual solder joints is summarized and introduced to everyone for reference. There is a slight blackening crack around the foot of the solder joint component. The crack becomes more and more obvious with the frequent occurrence of the fault. The heavy component can be loose, and the light is like a welded stone. The crack indicates that the solder joint has overheated and melted, and it will be delayed sooner or later. My approach is to carefully check all the black-spotted solder joints, especially the high-power devices, regardless of the fault, and find that the cracked solder joints are soldered. This step is familiar with the solder joint crack characteristics. Ten minutes is enough, and you can often get twice the result with half the effort.
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