Good afternoon companions, they brought me a Panasonic SA-MAX750 sound system without audio, with the naked eye and so it shows the front LCD, it fulfills all its functions of: Tuner, USB, CD, volume, remote control; but in all these functions there is no audio like neither does [url=https://www.google.com/search?client=firefox-b&q=bluetooth&spell=1&sa=X&ved=0ahUKEwis1KTq-_zeAhUInlkKHW31AVAQkeECCCooAA&biw=1366&bih=652] blue / url] I started doing my tests verifying the 3.3 volts to the IC2000 VUEALLPT056, there are also no shorts between ground and 3.3 volts, then I introduced audio signal through the AUXILIARY port with an mp3, following that signal with a signal tracer that I did , but when arriving at IC2000 VUEALLPT056 on pins 15 LIN and 16 RIN the signal enters and through pin 13 SDO where I interpret that the audio signal should be output, what comes out is noise. I do not know if the signal is transformed to a digital signal, but I would like to know if someone could do me the favor of collaborating by indicating how I could measure this output signal with the audio plotter or if I need an oscilloscope as I could measure it. Thanks for the collaboration. Attached link of plans. https://www.manualslib.com/download/1378820/Panasonic-Sa-Max750lmk.html

I suggest you first try resetting using the Cold Reset