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Microballs at CMC

more examples
Description:
Microball by the side of the left CMC (connected solder ball).

Causes/Remedy:
  • faulty solder paste printing
  • unsuitable or wrong dimensions of landing pads
  • wetting problems during the melting process
  • smeared solder paste
  • dirty printing stencil

Source: visual, optical inspection - general view
Microball at the side of a CMC

Description:
Microball by the side of the CMC (connected solder ball)

Causes/Remedy:
  • faulty solder paste printing
  • unsuitable or wrong dimensions of landing pads
  • wetting problems during the melting process
  • smeared solder paste
  • dirty printing stencil

Source: SEM
Microball by the side of a CMC

Description:
Microball by the left side of the CMC (connected solder ball)

Causes/Remedy:
  • faulty solder paste printing
  • unsuitable or wrong dimensions of landing pads
  • wetting problems during the melting process
  • smeared solder paste
  • dirty printing stencil

Source: visual, optical inspection - general view
Microball by the side of a CMC

Description:
Microballs between two CMC components. If the microballs come off easily, the assembly should be cleaned.

Causes/Remedy:
  • faulty solder paste printing
  • unsuitable or wrong dimensions of landing pads
  • wetting problems during the melting process
  • smeared solder paste
  • dirty printing stencil

Source: visual, optical inspection - general view
Microballs between two CMC
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