OEM ODM Air Conditioner Electronic PCBA Assembly Service What is PCBA assembly service? PCBA (Printed Circuit Board Assembly) assembly service is the complete industrial solution that turns a bare PCB into a fully functional circuit board by purchasing all the specified electronic components, mounting them onto the board (using SMT, THT or both), soldering, and then testing the finished assembly. In practice, a PCBA service provider will: Review your Bill-of-Materials (BOM)