Its probably time to admit I have started to suffer from dementia and some form of blidness too. When I was first looking for any traces of what could actually be the root cause of all the multiple failures this board has, I did thorough inspection of it. First I gave it a bath in IPA and when it's got nice and shiny, I inspected every singe component and visible trace under the 6x magnifying desktop glass. Except for all the missing components, that were taken off cleanly, I found no trace of visual damage. Nothing that would give a clue of how/why the board died.
I am saying this because in 90% of all cases it fails from obvious reasons, most common one is somebody has been toying with new soldering iron. Second place takes failures from mechanical damage caused by improper handling.
So I found nothing apparent, that is untill today. Because only today I have realized, that what I have been thinking is a medium case of DSP connector corrosion is in fact a true welding burn mark, caused from obviously high current electric arc. So thats how the board died - electrocuted!
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