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Originally Posted by TierraDelDiablo
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Nothing displayed but you do want to build one of these...
http://www.ifirobotics.com/docs/comp...guide-reva.pdf
If you have made one and that seems to be the problem, then you may have shorted a pin when you assembled it. One thing I just though of, (but I think it is mentioned above.) have you tried replacing the modem cable with a new and shorter one? Over the years, teams have had trouble with the modem serial cable just going bad. They get run over and stepped on and the cable is damaged internally. Remember, besides running data the cable is also trying to supply power to the radio. BTW, the RC modem does need to be mounted so that the antenna is not against metal or buried deep inside the robot.