audiobahn a18001dj no output

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Hello everyone, I'm new here and new to working on amps, I am having some issues with an Audiobahn A18001DJ class-D amp. This is the problem, When power is on, HU's RCA jacks plugged in and on, and sub hooked up i get nothing but a low hum from sub. Protection light is not on but still no sound, i have checked all output transistors and they all seem good, i don't understand the problem. Any help in this matter would be appreciated.
 
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