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I just got this today, plugged it in my arduino, and the arduino light starts dimming until you cannot see it any more over the course of 5 seconds. The Computer disconnects the arduino when the light is off (Ding Dong Sound). I found pulling the VIN Connector Jumper/Power Jumper will stop the short circuit and work, but that defeats the purpose, as the board wouldn't even powered.

Here is the video: YouTube

Is the motor board broken? If so in what way? are the wires on the board simply broken? Is it due to bad soldering?(I checked solder, looks fine).

Arduino Model: Arduino UNO by Elegoo Motor Driver Model: L293D Driver Board Ebay Listing For Item (I tried using this with a MEGA also, would short it as well).

  • Please edit your question to include the name, model number, and a link for the motor shield. Otherwise we're just guessing – James Waldby - jwpat7 Feb 10 '17 at 4:07
  • post is edited. – George Jones Feb 10 '17 at 4:13
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    Does the board work ok if you pull that jumper and supply motor-power externally? If so, maybe the Uno's power is marginal. If not, maybe a chip or a capacitor is bad on the shield. Looks like the chips are socketed, so you could take them out (sequentially) and see if shorting problem goes away. If one of two LM293's is bad you could still use the other. But before removing any chips or capacitors, get a really bright LED flashlight and carefully look all over the board for solder splashes, wire fragments, etc – James Waldby - jwpat7 Feb 10 '17 at 6:48
  • I pulled all the chips out. They all work in the middle slot. The left and right slot will immediately short it, even if I place one – George Jones Feb 10 '17 at 12:30
  • Have you tried it with nothing connected to the board and the jumper removed? At the end of the day its a $2 board, from what you have described it has a fault and the seller would have a hell of a problem denying it. Buy another from a different seller and see if you can get this one replaced although it might cost more to send back than its worth. If you carry on testing it, trying to diagnose the fault you may trash you Arduinos. Keep the board for spare parts, chances are you'll fry the chips. :) – Code Gorilla Feb 10 '17 at 13:14
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Thanks to @jwpat7, I have discovered that the reason it is not working is that the seller has messed up and sent me 3 of the same chip, 74HC595N. After doing some research, I have purchased the LM293D Chips.

  • That's really horrible. Though it's worth noting that the L293, even if you actually got them, isn't a great solution to begin with. If you are facing down long shipping delays you might want to consider preemptively ordering a more modern solution overall rather than waiting for the L293's only to perhaps be dissappointed by them. Especially at lower voltages something using a TB6612FNG or similar may be preferable. Do note also that you really shouldn't be powering your motor drivers from the Arduino's logic supply or regulator. – Chris Stratton Feb 11 '17 at 0:54

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