My EZ Robot isn't powering up correctly. I just took the unit out of the box for the first time, completed the barrel wiring and connected it to the battery case. The unit did nothing until I picked it up and touched the heat sinks with two fingers when it flashed briefly (both blue and red) and then went dark. The batteries are fresh and I've checked the connections on the sinks and they seem fine. I've searched the boards but can't find a diagnosis.
Can anyone help?
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Robot-Doc might be onto something
We need the solder to reach a certain temp so that it can properly bond the two surfaces together. Usually, not always, you can see a cold solder joint because it tends to look "duller" or pale in comparison to a regular solder joint which tends to be shiny.
Let us know what you find!
Also since you said that putting pressure (squeezing) the two heat sinks together would turn on the LEDs then look around the soldered contacts on the dc jack that is mounted to the board. It's possible that there could be a poor solder joint there as well. And while you're looking around make sure the screws that hold the two FETs against heat sinks are tight.