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Opens at passives

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Decription:
Open at a THD (resistor, second from right). It is evident that solder is missing in the TH with the pin. The adjacent solder joints show a reduced solder filling, which is still acceptable according to IEC 61191.

Causes/Remedy:
  • poor wettability of the pins
  • residues/contamination in the through-hole
  • poor metallic structure in the through-hole (tinning)
  • unsuitable layout for the wave soldering direction


Source: visual, optical inspection - general view
Open at a THD resistor
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