"Просто осела пыль"
там под фоткой все написано

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(08-04-2017 20:28)adsh писал(а):  Чтобы именно ПОС пустил такие корни не видел даже на платах, которые старше меня лет так на 20.

так в ПОС есть свинец. Фото для безсвинцовых

P.S.
"Of those weapons programs, NAWC officials report that five-that’s 25 percent, mind you-built from 1985 to 1992 have had documented tin-whisker failures.

Reports indicate that six satellites sustained partial or complete loss due to tin whiskers. These involved Galaxy-3, Solidaridad 1, Direct TV3, and HS 601 satellites built between 1998 and 2002. Problems also have been reported with the F-15 jet fighter radar, the Patriot missile, and the Airborne Warning and Control System (AWACS) aircraft."

_http://www.militaryaerospace.com/articles/print/volume-16/issue-10/news/trends/lead-free-solder-a-train-wreck-in-the-making.html