Component misalignment causes up some PCB assembly failures, with costly consequences for SMEs. For high-mix productions, even 0.1mm shifts in BGAs or QFNs can create latent defects.
X-ray inspection offers critical insights beyond visual checks:
· Use multi angled views to expose subtle BGA shifts invisible from above
· Overlay digital grids to quantify misalignment precisely (down to 0.01mm)
· Analyze solder joint asymmetry—teardrop shapes or uneven fillets signal shifts
AOI systems need smart calibration, not just default settings:
· Create component-specific lighting profiles
· Adjust tolerances by criticality (stricter for BGAs than resistors)
· Validate daily with a reference board containing known misalignments
Our integrated workflow turns detection into prevention:
A recent case cut QFN misalignment largely by using these steps, saving cost much. SMEs don’t need enterprise tools—just systematic use of existing X-ray and AOI systems.
Contact Fumaxtech for our quick-reference calibration guide.
