high pitch noise

  1. J

    Need some help/advice

    So I have an (older) Kenwood DNX7120 DVD/GPS head unit in my 04 Silverado. I've been getting a super high pitch "squeal" out of the blue. When it happens, my head unit starts rolling through the different modes it has, tuner to dvd to video and then stops once it's found a mode in which it...