Electronics Assembly Knowledge, Vision & Wisdom HOME PROGRAMS DIRECTORY SUBSCRIBE Ask the Experts << Page 1 of 34 >> Arranged via association with Circuitnet.. See the Expert Panel | Submit A Questions | Join the Panel Programs are sorted by published date, most recent first. Directory Search         Program Search         Reworked BGA Bridging at the Corners Recently reworked BGA components are bridged at the corners. What caused the corners of the BGA component to bridge and how can we prevent it? Ask the Experts Estimating Failure Rate During Rework Is there a way to estimate the potential failure rate introduced by hand rework of one SMT part that involves de-soldering and soldering a new part? Ask the Experts LED Component Shift During Reflow What can be the root cause of SMT LED Component Shift during reflow? Ask the Experts Flux Residue Visible After 3 Months After 3 months at the customer site, we see white marks on the PCBA bottom side. The customer claims the white marks are flux residue. Ask the Experts Contaminated Joints Cause an Assembly to Fail RoHS Compliance Can a few contaminated solder joints cause an entire assembly to fail? Some of the joints were cross-contaminated with leaded solder. Ask the Experts QFN Test Failures Caused by Flux A test engineer claims that test failures are due to flux residue between terminations that affects the capacitance at the joints. Is this a valid claim? Ask the Experts Use of Nitrogen for Hand Soldering Is there any reasonable way to hand solder without flux? Is there such a thing as using nitrogen in a local area while hand soldering? Ask the Experts Wave Soldering System Nitrogen Use How can I calculate the amount of nitrogen used in my wave soldering system? Ask the Experts Conformal Coating in Nitrogen Environment We operate a conformal coat machine using nitrogen. We are thinking of changing it back to air for cost reasons, what are the pros and cons? Ask the Experts Problems with Insufficient Barrel Fill We are seeing insufficient barrel fill (60-75%) during lead free wave soldering. Can you point to some reasons why we may be seeing this? Ask the Experts Ask the Experts << Page 1 of 34 >> About | Advertising | Contact | Directory | Directory Search | Directory Submit | Privacy | Programs | Program Search | Sponsorship | Subscribe | Terms Circuit Insight 6 Liberty Square #2040, Boston MA 02109 USA Jeff Ferry, Publisher | Ken Cavallaro, Editor/Business Manager Copyright © Circuitnet LLC. All rights reserved. A Circuitnet Media Publication