How to distinguish the quality of p2.5 led display led module are major part of led screen , if there is problem with module it will directly affect the quality of led screen. so how to distinguish the quality of led screen. 1. pcb circuit board material of p2.5 led display normal manufacturers are using single side pcb material , that is not upto quality mark , normally its looking same but less than a year the difference will appear . so we are using double side pcb glass which will act as good quality till long time. 2. ic device observe what kind of ic they used , in order to save the cost most company are using low cost ic and mix other brand ic. 3. lamp and chips by just seeing its very difficult to identify quality of lamp and chips it can be tested after long time. 4.the quality of welding see whether the component is mounted properly or not and joints are smooth or not.