Electronics > Repair
Industrial board repair
CaptDon:
Removing SMD parts and cleaning the pads is hand work. Then you have two options, 1. attempt to put solder paste on the pads (by hand) then pick and place (by machine) then run through a reflow oven to solder the new parts and pray you don't get tombstoning or damage to parts that were hand soldered in the original manufacturing process, or 2. Remove by hand the damaged components, install and solder the new components by hand. Will the newer 'better' replacement components fit on the original foot print or are they bigger / different. MLCC capacitors almost always become unreliable when hand soldered. The temperature gradient forced by the rapid rise in local heat as well as the quick cooling when the heat is removed causes physical and thermal stress and usually results in unpredictable failure modes of both infant mortality as well as long term instability. Not saying it can't be done. Our touch up / rework line was all women and they were VERY good at what they did when they understood what they were doing. I never had a 'touch up / rework' guy who could compare to the women!!
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