Whey are D1 and D2 pins of SN650x push-pull transformer driver shorted to GND?
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D1 and D2 pins of SN6501, SN6505A, SN6505B and SN6505D are the switching nodes of the push-pull power supply solution. These pins are internally connected to open-drain power MOSFETs which drive an external center-tapped push-pull transformer to generate an isolated supply voltage. D1/D2 pins have an absolute maximum rating of 14V for SN6501 and 16V for SN6505A, SN6505B and SN6505D.
The following are the most common ways why D1/D2 pins are damaged and shorted to GND.