The goal of this thesis is to determine the optimal grain size for milling waste PCBs (printed circuit boards), as well as to analyze the composition of individual classes of milled waste printed circuit boards of TV sets, based on the analysis of certain grain size diagrams used to describe the proportion of classes of milled printed circuits boards from TV sets on a laboratory-scale. The analysis was carried out on the electronic and plastic part of the printed circuit boards. The rapid technological development caused an increase in the production of printed circuit boards, consequently generating significant quantities of this type of waste. The fraction of printed circuit boards (PCBs) in the mass of electronic waste (EE) is 3 to 6%. They are one of its most complex parts because they contain the most valuable (palladium, gold and copper), but also the most dangerous (lead, mercury) components. That is why this type of waste should be disposed of in an eco-friendly manner by using recycling technology, which represents a very demanding and complex process due to the heterogeneous composition of PCBs, that is also the cause of its limited use. For that reason, disposing of the entire printed circuit boards presents a better solution, at least for now, as the shredding multiplies the specific surface area, and thus the possibility of e.g. evaporation of harmful components. Therefore, further research should be aimed at perfecting the process in order to determine as precisely as possible the dispersion of useful and harmful components depending on the grain size of milled PCBs.