Pioneer AVH-X4800BS head unit. Ive had a whine coming out of my speakers for a few months regardless if the engine is on or not. I thought it was a ground loop but went through all the troubleshooting and still have the noise. Today i figured out that when you turn the display off (with the display off button) the noise totally stops. Ive never heard of this before, do you think the head unit is defective or is some wiring/ground still causing the whine when the display is on?
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