I bought a RepRapDiscount Full Graphics controller to run on my Mendel90 ( Marlin

3D Printing
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I bought a RepRapDiscount Full Graphics controller to run on my Mendel90 ( Marlin / Ramps 1.4 ) However I am unable to see anything clearly on the LCD screen even after I adjusting the contrast pod that on the front right of the controller.
I read somewhere that someone added more power to the Arduino board and that helps ?? Will it be ok to also add power to the Arduino Board aswell ?
What else can I do to get the contrast correct, without soldering etc .
Thanks

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I’ve just had the same upgrade to my machine. I’ve routed an additional 5V from the power supply directly to the LCD controller to get a stable display. Another method is having the USB cable connected to a “Strong” USB port. Good luck and enjoy!

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There should be a trim pot on the back of the LCD.

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@Keith_Applegarth There is a Trim Pot on the front that I tried to adjust. As soon as I turn it to the right it gets worse. I can not turn it left any further as it will break. So basically its sitting at its best. So I am stumped , don’t know what to do.
Also found that I can not print from my PC ( Repetier Host ) anymore , not sure why.

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+Peter van der Walt Sorry Peter I am lost. My Trim Pot is on the front and it works but as soon as I turn it , it gets worse. Just becomes totally blue screen.

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Thanks +Peter van der Walt , I check tonight. Do you know what resister I must add ?

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Does the screen act the same under only usb power? If not the voltage regulator in the arduino could be blown.