thermal via farm

100% fill those vias with non-conductive epoxy will fix what ails you 
in this case


At 12:42 PM 3/13/2012, Charlie Pitarys wrote:
>I have these PCB's (mixed technology) in house, used for an automotive under
>hood application. In several spots on the board are these array of holes. On
>the A-side a smt component like a thyristor will cover up the array.
>What are these there for?
>The wave flux residue is proving tenacious to effectively clean out of every
>via. Especially with the old school cleaning tool at this account.
>
>Some of the vias are clear but some have solder filling or partially filling
>them. These are now also filled with wave flux.
>Below is a link to a picture of the array.
>http://i123.photobucket.com/albums/o319/dartfrogmts/Kyzen/A-Side00140xFCR145
>F20min-1.jpg
>
>I'll get them clean but curious as to why these are on the board.
>Thanks in advance
>
>Charlie
>
>
>
>
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