During my time working with semiconductor fabrication, we encountered a significant issue where one of the fab lines was experiencing inconsistent yields, impacting overall production. My troubleshooting process involved several structured steps to identify and resolve the problem efficiently. First, I gathered the production data to analyze trends and pinpoint when the yield discrepancies began. I reviewed the specific processes involved in the fabrication line, focusing on equipment performance and any recent changes in materials or parameters. Collaborating with operators, I conducted a walkthrough of the fab line to observe the workflow firsthand and gather insights on potential operational issues. Next, I performed root cause analysis by isolating different segments of the fabrication process, testing hypotheses about potential sources of the problem. This included checking equipment calibration, inspecting critical process parameters, and reviewing contamination control protocols. By engaging the team in brainstorming sessions, we identified a malfunctioning tool that was affecting a critical step in the process. Once the issue was confirmed, I coordinated with the maintenance team to rectify the equipment malfunction and implemented a temporary workaround to maintain production while repairs were underway. After resolving the issue, we adjusted our quality control measures and provided training to the team to prevent similar occurrences in the future. This systematic approach not only resolved the immediate issue but also improved our troubleshooting framework for future incidents.