RAMPS 1.4 odd LCD failure.
April 06, 2018 11:25AM
I was recently testing endstops on my RAMPS board when I saw I had one plugged in backwards. I turned off the power and fixed the endstop, but when I turned on the power supply the LCD was completely white with all the pixels on. I can still see the LCD working if I view it from an angle and it works fine if only powered by only USB.

Any help would be greatly appreciated.
Re: RAMPS 1.4 odd LCD failure.
April 07, 2018 10:00AM
Can you measure the 5V output ( eg. on the endstop headers) if it's still 5V or more?
You have to power from RAMPS not USB and better remove all other stuff on RAMPS.
You might have killed the onboard 5V regulator and now it's regulating at a higher voltage. Hence the superbright LCD backlight.
Re: RAMPS 1.4 odd LCD failure.
April 07, 2018 02:21PM
Just tested the endstop pin and they are putting out 6.6v.

I assume that means the Arduino will have to be replaced.
Re: RAMPS 1.4 odd LCD failure.
April 08, 2018 02:11AM
Yup, the onboard regulator is toast sad smiley
You could also use an external 5V psu ( cellphone charger ), but that requires some modifications.
I haven't done it myself, so I'm not the person to give you advice.
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