The invention relates to a specific printed circuit (7) comprising independent etched blocks (4) or segments in series of four such that, on a series circuit comprising five LEDs, the four blocks serve as the positioning and connection points for the welding of the pins of the LEDs, said pins being welded in an anode-to-cathode series, or the reverse depending on the direction of the current, i.e. eight electrodes in isolated blocks, such as to ensure that the connection is powered and the LEDs are fixed correctly in series of five. According to the invention, the square or rectangular blocks have a large surface (2) such that the successive holes do not tear the film of epoxy copper. In addition, said blocks are disposed along a path and a successive diagram (21) defines the symbol or pattern to be represented by the LEDs (12) which are disposed and aligned on the other decorated face of the epoxy. The incoming or outgoing bases, which supply the positive (20) or negative (3) power, or the opposite depending on the direction of the LEDs, can comprise the outgoing or incoming base that is common to other series, by means of suitable etching. The negative is always at the center of the pattern. The circuit is divided into three connection zones, A, B, C, and is powered by external contact springs. The invention is intended for the series powering of a longilineal distribution of five LEDs in series, or a multiple thereof.