Per Ben Gumperts email.

 

I'm not sure the logic on baking a Conformal coated PCB?  If the coating is
working or you have residually absorbed moisture, you are creating a problem
by baking a CC'ed PCBA in my opinion.  The barrier of conformal coating
Ureathane or otherwise should be easy to remove and locally repair with
localized Reflow system.  If you are totally reflowing the PCBA, that is
even larger problem on rework.

 

I would remove the part, with hot air.  

 

Remove Conformal coating with appropriate solvent from the area of repair.

 

Rework/re-solder components

 

Reapply Components with localized Reflow and/or HotAir system.

 

There will be some aesthetic issues, but with proper solvents and cleaning,
you should not have issue with moisture in the PCBA more than any other
issue.

 

Is this RoHS or 63/37 solder?

 

How long have they been in Ambient conditions?

 

What is the laminate?

 

What is the plating?

 

What technology is the components that are to be reworked?

 

Just my couple of CNY..

 

Rodney


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