I concede. My TA7801 has no gate signal and I’m unsure on how to diagnose it, help would be greatly appreciated!

[TF3]

I recently received a TA7801 along with two subwoofers in the factory box, the amp didn’t go into protect, but had zero gate signal after further diagnosis, and I am unfortunately not experienced enough in amps to know where to trace it to. Any help would be extremely appreciated!