When we encounter the problem of open/open circuit in FPC (soft board), the easiest way is to check the problem of wireless break under the microscope, because FPC is usually a single-layer board, and it is not a three-layer board. Most of the lines can be seen through optical instruments, but the work bears have encountered many cases, and the problem of line breakage cannot be checked under the microscope. However, the place where the three fingers are used to directly measure the gold fingers is It is possible to measure the open circuit or the good or bad situation when contacting.
In fact, there is no need to make a fuss about such a result, because FPC is called "soft board" because it can bend and bend, which is also the advantage and shortcoming of FPC. The disadvantage is that it can be bent because it may lead to copper foil. The copper trace broke.
Although the copper foil is soft, repeated repeated bending or reciprocating motion or impact is still very likely to cause the fracture to occur. If it is visible to the naked eye, it is easy to solve the problem, because only the position of the fracture is observed. In general, the cause of the fracture can be known, and further countermeasures can be taken.
It is more difficult to measure the open/open circuit from the end of the gold finger, but how can the copper foil break position be found, and it is difficult to confirm the cause of the fracture caused by the position.
When the working bear analyzes the problem of soft flat cable breakage that is difficult to detect by the naked eye or the microscope, the segmentation method is usually adopted.
1. First observe the problem line with a microscope, first find the location of the suspected fracture as a mark.
2. If the microscope can't find any suspicious breaks, you can divide the line into small sections.
3. At both ends of the line where the line may break, or at the position of the segment, carefully cut the cover film of the soft board with a blade, preferably with a new utility knife or carving knife, and then Place the blade on the outer cover and move it left and right to scrape the cover film and expose it to the underlying copper foil line. This way you can take a three-meter meter to measure the line. Then gradually remove the position where the breakage may occur, and finally find the exact location of the fracture of the copper foil line.
4. If you are worried that this method may break the copper foil line, you can also try to cut the copper foil line next to the copper foil, and then try to tear the cover film to achieve the same purpose. .
(This method requires great care and skill. The work bear believes that capable engineers should be able to do it.)
5. Once the exact copper foil line break location is found, if the fracture is still not observed, try bending the soft board at the location under the microscope so that the opening of the broken copper foil can be highlighted and enlarged.
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