Yuzal rarely, 7 months. 7 and 8 LEDs on the transmitter burned out. For a simple check of the integrity of the lines is quite suitable. If the line is normal, the diodes shine in parallel, one at a time, without gaps and returns. If there is a short circuit, then two or more diodes will light up at once (on those lines between which there is a short one). If the conductor is broken or the knife is not finished in the connector, then the diode on the broken conductor number will not light up. If the sequence of conductors in the connectors is mixed up during crimping, then NOT the same numbers on the receiver and transmitter will be highlighted, with skips and returns. The same story if the line is overcrossed.