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January 10, 2023

How To Rework Warped PCBAs?

From a large lot, 20 populated boards with components of varied heights on both sides are warped. What methods can they use to flatten them? Jim Hall and Phil Zarrow, The Assembly Brothers, discuss this situation and offer their own suggestions.
Board Talk

Innovative of CU Electroplating Process for Any Layer Via Fillwith Planer Via Top and Thin Surface Copper
PCB manufacturers need another additional processing step to chemically etch the deposit until they reach a planer surface to build the next layer without issues.
Production Floor

Technical Papers

■	Investigation & Results on the Phenomenon of "Flying" SMD Components
■	The Transformation of the New Generation of X-ray Machine
■	Master Advanced Packaging Inspection
■	Keys to Component Lead Tinning Success
■	X-Ray Supports Quality Assurance, Counterfeit Detection
■	Be Selective in Partnering with a Soldering Equipment Supplier
■	Effects of Long-Term Storage on Mechanical and Electrical Integrity
■	Selective Equipment in Spec?
■	Why the need for 3D SPI?
■	Dealing with the Results of the Pandemic

Pre-bake in a Vacuum
Can the time for pre-baking of components and bare PCBs to eliminate moisture be reduced by using a vacuum oven? What percent of bake time reduction
Ask the Experts

Addressing the Raw Material Shortage for Electric Car Batteries
There are not enough raw materials, for batteries if everyone is to have an electric car. Even if there was, charging them would take too long for many applications.
Technology Briefing

Achieving Solder Reliability for LGA Ceramic Image Sensors
The stencil aperture design has more influence on overcoming CTE mismatch between the ceramic LGA and the FR4 PCB than the reflow oven temperature profile cool down slope.
Analysis Lab

Attributes of Cored Solder Wire in LED Luminaire Soldering
Reflectivity as a metric to quantify "shininess" is presented. An approach to quantifying "Reflectivity" of solder alloy joints has been developed.
Materials Tech

Soldering Immersion Tin
This paper focuses on awareness of factors attributed to soldering i-Sn including IMC formations in relation to reflow cycles and solderability performance.
Production Floor

Reflow Causing Warp
We have a 20 layer PWB that is not balanced, 8 of 10 - 1oz cu layers in the bottom half vs 2 of 10 - 1 oz cu layers in the top. The board bows during reflow. ...
Ask the Experts

Weibull Distribution and Analysis: 2019
This paper provides an overview of the Weibull distribution, its variables, types of data required, and interpretations that can be drawn.
Analysis Lab

Issues With BGA Rework Residue
After BGA rework there is an outline of residue on around the pads. Is it necessary to remove this residue to reinstall a new BGA?
Board Talk

Hybrid Conformal Coatings for Mitigating Tin Whiskers
In this stydy, nanoparticles were functionalized to bind them to the polymer structure while avoiding the collection among the particles.
Materials Tech

Supplier Spotlight

ASYS Group Americas Inc.
The ASYS Group is a leading manufacturer of process handling ...

Heller Industries Inc.
Heller Industries, the market leader in oven technology, supplies solutions ...

Conductive Containers, Inc
It’s always fun and rewarding to be the best at ...

Nordson EFD LLC
Nordson EFD LLC (formerly known as EFD, Inc.) is a ...

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Portable Desalination Unit Addresses Drinking Water Shortage
Researchers have developed a portable desalination unit that generates clean drinking water without the need for filters or high-pressure pumps.
Technology Briefing

An Introduction to the Process of Printed Electronics
While following best practices, researchers aim to create processes that ramp up the scale of production for simple circuits and integrated conductive structures.
Production Floor

Test Methods for Electrochemical Consistency in PCB Assembly Processes
This paper will review traditional and emerging methods to characterize flux residues and cleanliness of finished assemblies.
Analysis Lab

Tied Up Telephone Lines
One day a of network phone links between several major plants became tied up. What was causing this phone link problem?
Mysteries of Science

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