This modul was normal flow items from the production history.
When we produced, bonding mark of returned modul was normal, so passed AOI & microscop inspection as normal items.
“Vertical blue line” occurred after shipped by pattern of panel was corroded by human body of contamination.
After finishing manufacturing operation, we will do visual and functional inspections.
We didn't find the abnormal phenomenon according to the production history.
This kind of defect will not result in line defect immediately.