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(Update) I tried what you suggested Alex KL-1 and this Is the results. First I isolated pin 5 on the flyback and no change still a 0.3 short across the pads of C520. Next I checked the caps C516, C529, and C541 and they all passed with flying colors. even though it's pretty slim chanch it's the yoke but I thought couldn't hurt and as expected no change. Then I completely removed the STK module from the board and still shorted across the pads with or without C520.
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