Vibrations introduces excessive dynamic loading on printed circuit boards (PCB) and their surface mounted components, thus, causing premature failure of an electric/avionic equipment. In order to develop highly reliable products, an accurate understanding of the response of a product subject to vibration is required. This study was to determine the fundamental resonant frequency and damping of the PCB supported by different types of retainers. Free vibration tests were conducted using a 3(superscript f) factorial experiment with two replications for each case. Computer simulations were also performed to estimate the fundamental resonant frequencies of the corresponding cases. The information was used for the guidance of the experiments and for the comparison with the real system response. The Logarithmic Decrement method was employed for the damping calculation. Frictional damping at the supports of the board/retainer system was determined as well. A statistical analysis software was utilized for curve fitting process. The results are summarized to provide the information when using retainers as PCB supports.