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870 expert questions.

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Mar 1, 2025
Conformal Coating in Low Humidity Environments
Whereas conformal coating is excellent for high humidity protection - is there any performance impact when subjected to ...
B.L.

Feb 29, 2024
Solder Paste Alloy Check
We have a production line that runs mainly leaded paste. We accidentally assembled boards using lead-free paste and ...
R.L.

Feb 28, 2024
BGA Die and Pry Testing
See the image of a die and pry flip chip BGA. Are these results Kirkendall Voiding or some ...
J.J.

Feb 27, 2024
Cause of Green/Blue Oxide Buildup
My organization is responsible for performing depot level repair to circuit card assemblies. We are encountering some serious ...
M.P.

Feb 26, 2024
Cleanliness Testing
What are the latest techniques/methods for testing the cleanliness of an assembled PCB after going through our in-house ...
A.R.

Feb 23, 2024
Flux Oozing from Insulated Wires
We have a problem with flux and wiring. Our wires are stripped and tinned. It appears that throughout ...
K.C.

Feb 22, 2024
Dross Particles Sticking to PCBs
We are wave soldering using 63/37 tin-lead solder. After wave, we are finding solder dross particles sticking the ...
K.U

Feb 21, 2024
Solder Paste Stencil Inactivity
How long can we leave solder paste on a stencil without any activity, wiping, etc.? ...
S.K.

Feb 20, 2024
Selective Printing for BGA Components
We use common BGA packages on many of our low-end products. To save cost, could we print paste ...
A.J.

Feb 19, 2024
Syringe Dispensed Solder Paste for Hand Soldering
You recently had a discussion about the application of liquid flux for hand soldering operations. Would you advise ...
L.W.

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