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RAMPS 1.4 odd LCD failure.

Alex_1234

RAMPS 1.4 odd LCD failure.
April 06, 2018 11:25AM

Registered: 6 years ago
Posts: 27

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.

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o_lampe

Re: RAMPS 1.4 odd LCD failure.
April 07, 2018 10:00AM

Registered: 8 years ago
Posts: 5,232

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.

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Alex_1234

Re: RAMPS 1.4 odd LCD failure.
April 07, 2018 02:21PM

Registered: 6 years ago
Posts: 27

Just tested the endstop pin and they are putting out 6.6v.

I assume that means the Arduino will have to be replaced.

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o_lampe

Re: RAMPS 1.4 odd LCD failure.
April 08, 2018 02:11AM

Registered: 8 years ago
Posts: 5,232

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.