Originally Posted by Giorginetto
...when i turn the volume above 70% the screen flickers...
Is this with the engine running or not running? Are you driving the speakers directly from the head unit, or are you running line outs to a power amplifier?
In either case, your speakers present a continuously varying load to the electronics and your modern head unit and/or amplifier is attempting
to handle the high task/low impedance loads. By turning the volume past 70%, you have effectively used up most/all of the dynamic headroom your amplifier has to offer, whereby it is now clipping the signal, inserting [additional] distortion into reproduction, and over-taxing the electrical/charging system.
Try this...make note of the volume level at which the display beings to flicker, reduce the low frequency response [turn down the bass], and then re-check the volume level at which the display begins to flicker. My suspicion...you will be able to turn the volume higher.