kicker 750.1 Green light no sound

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Can anyone help me try to figure out why I have no sound from my kicker amp even though the green light is solid. I have called kicker and they no longer provide schematics and I don't really know what to test. I have eliminated the board that contains the gain and all that by taking it out of a good 750.1 I also know it's not anything related to the wiring in the car as I hooked a different amp up in the same spot and it works. I know it's somewhere on the board but no tell tell burnt components.
 
Thank you for your time I do apologize as it appears my second post with what I have tested did no go through. I will try this again though. I checked all those before with good results I checked the preamp board with a 12v result it appears that the signal dies in a component under the preamp board but I am unsure of what to look for in that region.
 
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