JC3248W535C Screen Flickering When Connected to Tonex One

[guitartonechaser]

Hi! I'm using the Tonex One Controller with the following board:

ESP32-S3 3.5" Capacitive Touch IPS Module
Board model: JC3248W535C
8MB PSRAM / 16MB Flash
Arduino + LVGL development board
320x480 display

I installed the two latest firmware versions through the website, and also tested some older versions.

Current setup

• JST cable connected to positive and negative -> 5V power source
• USB-C connected directly to the Tonex One

Issue

After flashing the firmware, the screen updates and works normally by itself.

However, when I connect the board to the Tonex One, the amp image stays on the screen but the display continuously flickers/blinks and never stabilizes.

The device does not fully freeze, but the screen keeps refreshing/flashing constantly - even if i still see the tonex amp image...

I also noticed that the screen behaves normally when powered alone, but the flickering starts immediately after connecting the USB-C cable to the Tonex One.

I already tried changing cables, and right now I'm using an iPhone USB-C cable.

Any tips on what could be causing this?
Could this be related to USB communication, power delivery, cable quality, or firmware compatibility with the JC3248W535C board?

Thank you so much 🙏

[guitartonechaser]

I'm sorry guys, I think it might just be a bad 5V power supply. I'll try another one again and test it further. Thanks for the help!

[Builty]

Hi. This does sound like a power issue for sure. A phone charger may not give much current if the USB data lines are not connected. A few users have had troubles with this.

[guitartonechaser]

it was a faulty 5v power supply! it worked even with a simple usb-c cable! Looks great, thanks!! by the way, it will be available for the tonex one+ soon? thank you!!

[Builty]

Great. I do plan to support the plus but I need to wait until they become available for me to purchase in Australia so I can test.