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I had simar issue even wirh 2.8 nextion.
I placed a 2uH inductor in series with 5v line goingbto nextion and a decoupling capacitor of 100uF16v at the nextion side to ground.
That has reasonably reduced the rumbling noise created after introduction of Nextion display. Hope it helps.
On Mon, 11 Nov 2019, 9:54 am Justin Phillips K5AXL, <dolmdemon@...> wrote:
I have a v5 uBITX in Sunil's 5" case with audio amp kit. Audio sounds just fine until I power the Nextion display. It's got a terrible buzz, and you can hear digital noises when the display changes, or when you turn the encoder.