We use a UV curable solder mask for the PCB repairs our fir
Dear Ioan:

We use a UV curable solder mask for the PCB repairs our firm performs.

If it gets to more than a few areas (read 3-4) then the time it takes to do this manually underneath a microscope becomes too cost prohibitive. We then go to a stay-in-place stencil which "band aids" the mask. With this method you really have to make sure the stencil pattern is very tight to the vias/dogbone. The GERBER data of the site needs to be used to get this right.

We have seen mask underneath BGAs wich is so severely udercut or has such poor adhesion that no matter what you do you are fighting a losing battle.

Bob Wettermann





________________________________
From: Ioan Tempea <[log in to unmask]>
To: [log in to unmask]
Sent: Friday, February 20, 2009 7:47:01 AM
Subject: [TN] Repair soldermask

Hello Technos,

What kind of soldermask do you use for repair jobs under BGAs? You know, the original SM goes away when wicking the pads after BGA removal and we need to cover the vias back. And I'm talking lead-free. 

Thank you,

Ioan Tempea, ing.
Ingénieur Principal Fabrication / Sr. Manufacturing Engineer 

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