Hi
Check fuses in drivers footwell for screen and also amplifier.
When my amplifier packed up, I managed to blow one of the fuses whilst connecting and diconnecting the screen without disconnecting the battery.
❚❚ Lexus LS430 No Sound from Audio - Amplifier OK - LS 400 / Lexus LS 430 / Lexus LS 460 / Lexus 600h / Lexus 500h Club - Lexus Owners Club