An Analysis of the Factors Affecting Defective Reprocessed Liquid Crystal Display Module

In this study, the researcher found out the true causes of the No Display issue being encountered in the process with the help of the gathered data. One of the factors affecting the problem was the material itself. It was stated that the LCD’s flex is fragile and easily gets broken. With the help of the operations team, they sought for the approval of the station owner to conduct sampling, attach subparts and move the flex. 15% of the LCM showed No Display after this process. The team also conducted an X-Ray inspection on the flex traces of the LCD from the cores since the research stated that it has a micro-cut that is already inherited. 37% was found as the true cause. Most of the personnel are aged 29-38 years old. Majority of the respondents are male compared to females. Most respondents have been employed in the company for 4-6 years. All employees have completed the Display-Assembly, Display-Functional Test, and Display-BLU Restoration certifications. The materials that they handle are the overall root cause of the defects of the reprocessed LCD modules. The assembly of the parts and their fragility causes the defect since these factors are readily observable by the personnel. The strategic plan shall address the root cause of the problem regarding the defects of the LCM. To validate these factors, sampling of LCM’s and attachment of subparts and movement of flex can be done as well as X-ray inspection to detect cuts. Possible solutions to these issues include the application of UV adhesive (DYMAX) on the cut-in trace area of the flex and the replacement of flex through the FPC bonding process. The overall target is to reduce the display defect in LCD modules from 7.1% to 3.5%.