Victor, Is the hipot failing when testing line/neutral to chassis ground, or between grounds? How long are you running the test and at what voltage level are you running it? Depending on where you are testing is where it can be one of many items. If you are testing from line/neutral to ground for 1 sec (production testing), and the unit fails, then there can be a lead or trace to close to the chassis, or two leads close to each other violating the clearance distance. If you are running the test for 1 minute (design testing) on a production unit, then you could be triggering the protection devices within the power supply. There are other scenarios based on the design of the supply and application of the high voltage. Thanks, Toby Carrier, CID On Wed, Jan 13, 2016 at 10:05 AM, Victor Hernandez < [log in to unmask]> wrote: > Fellow TechNetters: > > What type of failure mechanism is associated with a HiPot Test Failure > on a 750W Switching Power supply? The visual did not turn up any damage > to components exterior structure. No damage to PWB laminate and solder > mash surface. > > Victor, > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ -- Toby