Many TV sets suddenly malfunction when watching TV. Sometimes they will recover quickly, and sometimes they will be fine after a slight vibration. This kind of fault is often called poor contact.
Poor contact can be divided into two categories. One is caused by oxidation or wear of the contact points of contact components (such as potentiometers); the other is cold soldering, including poor soldering, or high-power components at the soldering points, large current passing through, and aging of solder, which causes the soldering points to crack and cause faults. Most of the poor contact faults belong to the latter category. In actual maintenance, a set of simple and quick methods for finding cold soldering points have been summarized and introduced to everyone for reference. There is a circle of fine black cracks around the feet of possible cold soldering components. The cracks become more and more obvious as the faults occur more frequently. Heavy components can loosen, and light ones seem to be welded like stones. But in fact, since there are cracks, it means that the solder joints have overheated and melted, and if they are not handled, they will go wrong sooner or later. What I do is to carefully check all solder joints with black lines, especially those around high-power devices, no matter what the fault is. If I find any cracked solder joints, I will re-solder them. This step only takes ten minutes after I am familiar with the characteristics of solder joint cracks, and it often achieves twice the result with half the effort.
Reference address：A simple and quick method to find cold solder joints
Poor contact can be divided into two categories. One is caused by oxidation or wear of the contact points of contact components (such as potentiometers); the other is cold soldering, including poor soldering, or high-power components at the soldering points, large current passing through, and aging of solder, which causes the soldering points to crack and cause faults. Most of the poor contact faults belong to the latter category. In actual maintenance, a set of simple and quick methods for finding cold soldering points have been summarized and introduced to everyone for reference. There is a circle of fine black cracks around the feet of possible cold soldering components. The cracks become more and more obvious as the faults occur more frequently. Heavy components can loosen, and light ones seem to be welded like stones. But in fact, since there are cracks, it means that the solder joints have overheated and melted, and if they are not handled, they will go wrong sooner or later. What I do is to carefully check all solder joints with black lines, especially those around high-power devices, no matter what the fault is. If I find any cracked solder joints, I will re-solder them. This step only takes ten minutes after I am familiar with the characteristics of solder joint cracks, and it often achieves twice the result with half the effort.
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