This is sounding more and more like it should be sent off to the recycling center...
tho you might not be wrong, so i tried dooing that thing that guy said to do up there with the cone connections, i took out a knife and a old dvd player and hooked it up, at first it was working normally, so i tried twisting the the remais of the nob with a knife and it work perfectly, no force needed, just twist the knife and choose the input so i tried video 3 which is the front inputs, i plugged the audio pllugs in and the video to the tv and ... No audio, so i tried switching the speakers connections to front B since i knew those at least were capable of making the speaker make static noise, so i tried agn and no sound. Actually no no, i just remembered that when i tried to play it with the speakers conected to those cony things, it would turn on and go to protect mode after a couple of seconds, so i conected the speaker to front b but no sound, so i decided to try one of the back inputs for the DVD player, connected it, got another av cable to test teh video pass through as well, but once i turned it on the front display was dim, and it went to protect mode soon after i turned it on, so i started to panic and completely disconnected everything from the unit, so i tried turning it on agn, but the display was even dimmer this time, and it kept getting worse everytime i tried to trun it on, it has got to the point where i can see the display is trying to do it's best but only some L R symbols barely light up, and i can see it's going to protect mode as well, since changing the speaker of choice make a switch noise, and i can tell when it goes into protect mode when it does not do that sound anymore when i try to change the selected speakers and it also does a louder click when going to protect mode.
Just when i hadfound a solution for the reason it was scrapped at the first place, my dad only told me he scrapped it cause the nob broke off.
when i finally find a solution, more problems kick in, this sucks