How to quickly confirm the quality of the PCB board?

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When we get a PCB board and there are no other test tools on hand, how to quickly confirm the quality of a PCB board? We can refer to the following 6 points:

1. The size and thickness of the PCB board appearance must be consistent with the specified size and thickness without deviation. There must be no defects, deformation, shedding, scratching, open circuit, short circuit, oxidation, whitening, yellowing, unclean etching or excessive etching on the board surface, and there must be no stains, copper particles and other impurities on the board surface.

2. The solder mask is covered evenly and glossy, and there must be no shedding, scratching, copper exposure, offset, hanging, etc.

3. The silk-screen printing symbols and characters are clear, and there are no defects such as omissions, ambiguities, reverse printing, and offset.

4. The carbon film must not have defects, offset printing, short circuit, open circuit, reverse printing, etc.

5. The PCB bottom plate is formed without any leaks, deviations, collapses, fronts, plugs, bursts, reverses, crushes, etc.

6. Whether the edge of the PCB board is smooth, if it is a V-CUT process, you need to pay attention to whether the V-CUT slot causes a wire break, whether the two sides are symmetrical, etc.

Generally through these 6 points, you can quickly confirm the quality of the PCB board.

To begin with, inspect the PCB traces. These should have a solder mask layer that prevents the copper on the board from experiencing shorts or oxidation. The solder mask typically comes in different colors, with white being a bit difficult to see the traces.

Additionally, ensure that all the traces are straight and have no bends. This is because bent lines could reduce the efficiency of such boards for high-power and high-efficiency applications. You need to be absolutely certain before accepting PCBs with any kind of bends.