LCD flickering white screen

Mostly Printed CNC - MPCNC Troubleshooting
1

Hey, so I noticed last night that if I have the power supply only connected to the RAMPS (I have the laptop power supply) and don’t have the USB connected, the LCD screen is unreadable and flickering white like there’s an electrical issue. Plug in the USB and it’s all good.

Any ideas ?

2

Did you get it from me?

3

Ya.

4

It works fine connected to the PC. Anything I should check for ? Just doesn’t work without the USB powered.

5

@Vicious1, what should I do about this? Reflashed RC7 and it’s the same. What should I look for?

6

Sounds like your 5v regulator went out on the mega. you can replace it, or cut the diode on the ramps and power the top and bottom boards separately.