FPC open circuit and broken circuit inspection method

When we met FPC (FPC) open / opening question, the most simple method is examined under a microscope without line (Trace) fracture problem, because FPC is generally a single plate, three great plates, line can mostly through the optical instruments to see, but the case is encountered many times not, check out the line breaking problem under the microscope, but with a three meter measuring directly the gold finger is capable of measuring to open, or contact when the bad situation.


In fact, don't get excited over a little thing about this result, because the FPC is called the "soft board", because of its soft can be bent, and this is FPC's advantages and disadvantages, but also its shortcomings can be bent, because may lead to a copper foil circuit (copper trace) fracture.


Although the soft copper foil, but repeatedly bend repeatedly or reciprocating back and forth movement or impact, or is likely to lead to the occurrence of fracture, if the fracture is visible to the eye are easy to solve, because as long as the observation of the fracture position, basically can know the cause of the fracture, and take countermeasures.


It is difficult to measure the opening / breaking from the end of the gold finger, but how can not find the location of the fracture of copper foil, can not find the location, it is difficult to confirm what is the cause of the fracture.


In the analysis of the problem of the soft line fault, which is difficult to be detected by the naked eye or microscope, the method of subsection elimination is usually adopted.


1. firstly, the line of the problem was observed by microscope, and the location of the suspected fault was found.


2. if the microscope can not find any suspicious fracture location, the line can also be divided into several sections.


3. positions of both ends of lines may be broken, or the location of blocks with a blade, carefully put the soft board outer cuticle (cover film) cut, best to take the new knife or knife, and then put the blade in the outer film to move around to scrape the outer cuticle (cover film), and to expose the copper line. So you can take three meter to measure the line. Then, the position of the fracture can be ruled out gradually, and the exact position of the copper wire can be found.


4. if you are worried about this method to break copper lines, you can also try to foil line next to no copper foil position cut, and then try to tear off the outer membrane (cover film), to achieve the same goal. Once you find the exact location of copper line fault, if still not observed fracture phenomenon, try to bend the soft board position under a microscope, it can highlight and enlarge the opening of the fracture of copper foil.


5. once you find the exact location of copper line fault, if still not observed fracture phenomenon, try to bend the soft board position under a microscope, it can highlight and enlarge the opening of the fracture of copper foil.


 

(Source: Inside information)

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