AQ -1200

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If that's the signal on the gates of the FETs, the problem isn't the drive signal. The only exception to that may be if the driver IC is defective and the drive pulses are in phase instead of out of phase.

You can determine if the pulses are out of phase by using both channels to view drive waveforms from pins 9 and 10 at the same time.

It's more likely that the transformer is shorted.

You should try pulling the rectifiers to see if the excessive current draw is eliminated.
 
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