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Knowledge For PCB How many ways to test quality of a PCB board?

How many ways to test quality of a PCB board?

October 26, 2022     Knowledge For PCB

How many ways to test the quality of a PCB board

 

To avoid failures and defects in electronic products, circuit board prototyping and test PCBs are among the most important steps in the manufacturing process. When the production phase skips testing PCBs, electronic products are at risk of errors and problems that can lead to large-scale failures. This is why PCB quality testing should not be ignored because testing ensures that the PCB can be executed successfully.

electrical path test

So, how can you avoid the high cost of PCB testing while producing high-quality electronics? Let's take a closer look at the following seven PCB testing tips.

       1, ICT(In-circuit testing)

The most popular PCB prototype inspection is in-circuit testing (ICT). It is reliable because it provides a high fault coverage verification method that covers most of the electronic components that are part of the PCB assembly.

So, how does in-circuit testing work? This type of testing controls the hardware of the PCB and eliminates the chance of human error. The testing steps include.

Placement of fixed probes.

Check the connections.

Start the test.

Inspect the assembly points on the PCB and check that they are secure by applying a small amount of tension to them.

When ball grid arrays or large assemblies are required, you should use in-circuit testing and perform the test after assembly is complete.

  1. AOI(Automatic optical inspection) test

Similar to X-ray inspection, AOI relies on visual testing, using a camera to check for any emerging problems during the initial stages of assembly.AOI testing is performed by the following steps.

It begins by capturing an image of the part to be tested on the board.

The image is compared with a subdivisional diagram.

If the board matches the diagram exactly, then the test is successfully completed.

AOI testing is best suited for early detection of problems that may occur on the board during the fabrication processing. We recommend not relying on AOI for full-scale testing. It works best when you include ICT or flying probe procedures to get more accurate results.

  1. X-ray Inspection

X-ray inspection (AXI) is used as an inspection tool where the X-ray technician tests by locating defects during the manufacturing phase. the X-ray technician specifically looks for elements that are difficult to locate with the naked eye, such as barrels, joints, and internal traces.

  1. Reverse polarity

Once you fix the power supply to the IC(integrated circuit) in the facing polarity, it's a big job. You will observe a soft popping sound, a little smoke, and a familiar bitter taste. Removing the damaged components will now be a simple process. You may, however, get damaged pads.

  1. Short circuit

The main cause of PCB prototype defects is short-circuiting. To perform testing, turn your attention to fine-pitch components, such as LQFP (low-profile quad flat package) size microcontrollers. A small fastener creating a short between two pins in close proximity can damage the microcontroller when it is turned on.

What can you do in case of a short circuit? First, measure the resistance of all types of voltage nodes associated with the ground. For example, if you use 12V, 5V, and 3V power networks in your PCB, any one of them could cause a short to ground due to faulty components or incorrect soldering. If left unaddressed, defective components may heat up quickly when turned on.

  1. FCT(Functional certification testing)

In addition to circuit board prototyping, some customers prefer traditional functional testing, where they should provide parameters for inspection. For functional testing, an engine control module (ECM) is used to confirm that the product can be energized. Functional testing is required.

Fixtures

External equipment parts

Prerequisites for MHSA, UL and other standards

The only downside to functional testing is that it takes a long time. If you want to get your product to market quickly, you should skip functional testing. However, from a quality assurance and long-term perspective, functional testing can save money.

  1. Burn-in test

Pre-burn-in testing is an intense form of testing for PCBs because its purpose is to catch early faults and initiate load capacity. Because burn-in testing pushes a lot of power through the electronics, it can damage the component under test. For example, the power supply runs continuously on the board for 48 to 168 hours. If a board fails, this is known as baby death.

When is it ideal to use a burn-in test? If you have a new electronics release and you want to make sure you've covered all the bases, performing burn-in testing can avoid a dangerous product release before customers buy. Just remember that burn-in testing can reduce the life of a product, especially if the board is put under more stress than it can handle. If no defects are found, you can reduce the number of test phases, shorten the test time, and prevent PCB overwork.

Contact WDXPCB for quality Circuit board fabrication

As you can see, upon several PCB inspection tips give you a variety of circuit board fabrication options to choose from. The main challenge is finding out which option works best for your product. with your great request, the WDXPCB team is always here to assist! For a free quote, call WDXPCB 86-13928973943 or email us here.


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