I am new here, so bare with me If I am a total noob.
Anyway, I have a Sony Walkman WM-EX49. Which originally would only play audio out of the left channel, with the right channel not working and only giving out a whinning sound ( I have some audio that I took below of the issue).
After taking it apart looking at the diagrams from the service guide, after lifting over the circuit board, I went to replace back the battery into it to test it, (after making sure nothing was shorting out). But the walkman won't do anything at all now . No play, fwd, rev etc.... nothing.
I equipped myself with my dads multimeter and saw that the connections coming from the battery going from the terminals to the circuit was good. So no issue there.
I have a slight feeling it could be them old ribbon cable but no sure.