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5 inch Nextion noise

 

I use an unenhanced Nextion 5inch display with its own LM7805 supply. There is a high pitched whine that I don¡¯t hear on my other ubitx that has a 3.2 inch Nextion. Both running CEC firmware. Tried bypass capacitor at the power line to the Nextion but the whine persists. Any suggestions?
 

Hello ! try ferrite ring on the Nextion's power supply line. And shield the back of the screen with PCB, works well.


Le?jeu. 3 juin 2021 ¨¤?06:37, John Terrell <N6LN@...> a ¨¦crit?:
I use an unenhanced Nextion 5inch display with its own LM7805 supply. There is a high pitched whine that I don¡¯t hear on my other ubitx that has a 3.2 inch Nextion. Both running CEC firmware. Tried bypass capacitor at the power line to the Nextion but the whine persists. Any suggestions?

 

Make sure the backlight is at 100%.? A PWM signal controls the brightness and I get noise on mine when at anything other than 100%
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Dennis WC8C

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