Xtc class d amp no output drive signal

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Hi guys im a bit puzzled with this amp can't get drive signal i checked 15v regulators both - + checked 12v regulators changed lm393 tl072c and lm311 on driver board but still no drive signal what do i check next
 

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You stated that you have no drive signal. That would mean that the output stage is absolutely dead, no rail-rail oscillation, nothing.

When the output stage is not functioning normally, there is no feedback to the driver board so you will see signal. When the amp is working normally, you will not see any signal into the driver board because it will be cancelled output by the feedback signal.

The input pin is labeled on the attached diagram.
 

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