Ok its been a long time since i plugged em in, like 7 years, they quit working, i believe they no longer turned on (if i remember the power know and the red LED didnt light up)
I took apart the subwoofer box that houses the PCB, i tested most of the resistors and capacitors on the PCB and the zener diodes they all seemed fine. There is no burning or anything on the PCB, Im not sure how to test the audio connectors, 1 is a 7 pin Din plug, kinda looks like a ps/2 port, and then 2 normal audio jacks. The subwoofer plugs in to a 120v outlet (USA here). Looks like there is a transformer or something mounted inside the box of the subwoofer. Im wondering if that could be bad. How could I test that, and is there anyway to test the CMOS chips on the PCB, and test the other items i circled on the first picture.
I will put em back together and re test em to make sure exactly what is wrong, sorry i didnt do that first, wasnt thinking, was too excited to use my new multimeter lol.
Also i havent been able to find any schematics this is the best thing i found
https://www.manualslib.com/manual/249412/Altec-Lansing-Atp3.html?page=4#manual