![]() If you don’t measure a short, then it is time for the moment of truth, when you apply power. Measuring 20, 25 Ohms probably should not be alarming, but if you measure something like 5 Ohms or less, you should suspect and investigate a short. Resistance can be quite low under normal circumstances, depending on what type and amount of circuitry is powered by that rail. Use an Ohmmeter to measure resistance of each rail to ground with the board powered off. ![]() Here are some things to look for during the inspection:Īfter performing the visual inspection, before applying power, check each voltage power rail on the board to make sure it is not shorted to ground. Use a magnifier to see small details and look over both sides of the board in a methodical manner. The first step of bringup is to perform a thorough inspection of a PCA.
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