How to distinguish the quality of circuit board, 1. Uniformity and consistency of ink color. 2. Whether the uniform mark color is fuzzy or incomplete. 3. Whether the chip bonding position of IC BGA of the bonding pad is offset or whether the ink affects the bonding pad on the cover; 4. Whether the via hole and the ink plug hole are full or protruding; 5. Whether there is burr on the edge of the board after molding; the vertical alignment of V-cut is not offset and the depth is consistent.
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