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Time of issue:2020-07-15 00:00:00
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BGA welding quality inspection method

  • Categories:FAQ
  • Author:SAJ
  • Origin:
  • Time of issue:2021-06-02
  • Views:0

(Summary description)Before talking about the quality of BGA soldering, let's briefly introduce BGA. BGA is like our human brain for a fully operational PCBA, and it is the core command center. Therefore, the normal operation of a PCBA depends on the soldering quality of the BGA. The quality of BGA soldering depends on whether the BGA soldering can be accurately controlled during SMT chip processing, whether the subsequent inspection can detect soldering problems, and properly deal with related problems.
In addition, we also need to understand that the soldering of BGA is not like a resistance-capacitor component, as long as the...

BGA welding quality inspection method

(Summary description)Before talking about the quality of BGA soldering, let's briefly introduce BGA. BGA is like our human brain for a fully operational PCBA, and it is the core command center. Therefore, the normal operation of a PCBA depends on the soldering quality of the BGA. The quality of BGA soldering depends on whether the BGA soldering can be accurately controlled during SMT chip processing, whether the subsequent inspection can detect soldering problems, and properly deal with related problems.
In addition, we also need to understand that the soldering of BGA is not like a resistance-capacitor component, as long as the...

  • Categories:FAQ
  • Author:SAJ
  • Origin:
  • Time of issue:2021-06-02
  • Views:0
Information

Before talking about the quality of BGA soldering, let's briefly introduce BGA. BGA is like our human brain for a fully operational PCBA, and it is the core command center. Therefore, the normal operation of a PCBA depends on the soldering quality of the BGA. The quality of BGA soldering depends on whether the BGA soldering can be accurately controlled during SMT chip processing, whether the subsequent inspection can detect soldering problems, and properly deal with related problems.

 

In addition, we also need to understand that the soldering of BGA is not like a resistance-capacitor component, as long as the soldering is aligned to prevent false errors and omissions. BGA soldering: The solder joint is under the chip, and the position of the pcb circuit board is corresponding to the densely distributed tin ball. After the SMT welding is completed, the human eye looks like a black opaque square. Even if there is an internal problem, the specific cause is not known. Therefore, it is very difficult to judge whether the internal welding quality meets the specifications.

 

 

At this time, X-ray is needed for detection, that is, CT/NMR. Its advantage is that it can be used to directly inspect the inside of the circuit board by X-ray without disassembly. It is a commonly used equipment for PCBA processing plants to check BGA soldering. The principle is to stratify the BGA solder balls through the internal line tomography of the X-ray scanning surface to produce a tomographic effect. The X tomographic photos can be compared according to the original CAD design data and the user setting parameters, so that the conclusion of whether the welding is qualified or not can be drawn in a timely manner.


In addition to X-ray inspection of BGA, it can also inspect the solder joints of all packages on the PCB circuit board. However, it has one of the biggest disadvantages that it has high radiation, and long-term use is not beneficial to the body.

 

Therefore, if the BGA does not have inspection equipment, we can only observe the outer ring of the chip with the naked eye to check whether the collapse of the solder paste is consistent in all directions, and then align the chip with the light to check carefully. If every row and every column are With the ability to transmit light, we can roughly eliminate the problem of continuous welding. Of course, this inspection method is only suitable for surface observation. If you want to judge the quality of the internal solder joints more clearly, you have to use X-ray to inspect.

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