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Did you check to make sure the source button was not stuck in a depressed mode. If it is an analog button then it may have caught the corner of the face. If this is a virtual switch then I would say a control board is fried and cheaper to replace the unit then to fix it.
No, you have two separate issues. The tach is run by a logic chip in the instrument panel. This chip also runs other things, like the speedometer. So you have a bad solder joint on the tach motor(easy fix after the IP is out). The radio changing stations is because the button is stuck or moisture in the button. These aren't hard to replace either. You spend more time dismantling the radio than fixing the problem. Is the radio worth it?
I don't have a solution, but I have the same problem with our '04 Sedona. It just happened yesterday. I tried the reset button and it worked. My volume wasn't way up like yours, but my radio did reset. We have an extended warranty, so hopefully if this is going to happen again, our warranty will cover it. Thank you for posting your problem!
I pulled the fuse
put the fuse back in
turn on the radio, insert a CD
pulled the fuse again, counted to 5
inserted the fuse again
while the CD started playing I clicked the Menu button and used the tunning dial to select default settings, and it asks if you want to reset default choose yes.
my radio works fine now!