How to Troubleshoot Reflow

Inspection

• 1

  Rotate the soldered assembly and use the handheld magnifier to inspect each solder joint from different angles. Any hairline cracks or crevices indicate an inadequate flow of solder and the component will have to be re-soldered.

• 2

  Use the jeweler's screwdriver or dental pick to gently nudge the soldered joints. Small electrical components are easily damaged, so be sure to probe with light pressure. Look for any movement, which indicates a poor joint that needs to be re-soldered.

• 3

  Look for misaligned components that are soldered at angles or different heights. This indicates a lack of solder and could prove problematic once the assembly is powered up.

• 4

  Inspect all soldered joints --they should be uniform, concave and glossy. Dull or bumpy surfaces indicate cold solder joints which will restrict the flow of current.

• 5

  Examine all components; none should be pressed flat against the assembly, and the presence of any solder balls, debris, or solder bridges will mean the components have to be re-soldered.