<![CDATA[The increasing implementation of Internet of Things (IoT)-based security monitoring systems requires high communication reliability to ensure continuous and accurate data transmission. However, connectivity failures caused by electronic component degradation, communication instability, and device design limitations remain significant challenges that can reduce system performance. This study aims to analyze the root causes of connectivity failures and develop reliability improvement strategies for IoT-based security monitoring devices using an integrated Fault Tree Analysis (FTA) and Failure Mode and Effect Analysis (FMEA) approach. The research was conducted on the Alarm Node-PR22 device at PT Eyro Digital Teknologi using failure data collected from October 2024 to March 2025. A total of 66 failures were identified from 500 installed devices, consisting of 3.3V Power IC failure, internal antenna failure, total device failure, and SIM800 module overheating. The FTA method was applied to identify failure pathways and determine basic causes, while FMEA was used to evaluate risk priorities based on severity, occurrence, and detection parameters. The results showed that 3.3V Power IC failure was the dominant failure mode with a total Risk Priority Number (RPN) of 1390, followed by total device failure (1328), SIM800 overheating (1198), and internal antenna failure (902). The highest individual risk factors were permanent IC silicon layer damage and PCB short circuit caused by solder bridging, both with an RPN value of 648. Based on these findings, improvement strategies were proposed, including component replacement, maintenance improvement, ESD protection implementation, casing redesign, and PCB layout optimization. The integration of FTA and FMEA provides an effective reliability analysis framework for identifying failure mechanisms and improving the operational reliability of IoT-based security monitoring devices.]]>
Copyrights © 2026
