Hi, I recently purchased a new LCD screen, my problem arises with this has a whole line, and quite thick, pixels which do not show information, if anyone knows the solution would appreciate it.

Test with short cables.

What controller is this on?

I'm already using short cables, I'm using Marlin 1.1.9 with ramps.

Try the GLCD tester [github.com]


What are those cables, they don't look like normal ribbon cables.

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Dust
Try the GLCD tester [github.com]


What are those cables, they don't look like normal ribbon cables.

They look wrapped in aluminium foil. Are you sure there are no shorted pins?

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http://www.marinusdebeer.nl/

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Ohmarinus
They look wrapped in aluminium foil.

That is my guess also, which you would normally only try if you where trying to sheid overly long cables...

Which is why I said to use short cables for testing.

Its just problem of your display beeing to slow (lik mine), i added the ST7920_Delay setting, since that time its fine
#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
#define ST7920_DELAY_1 DELAY_NS(63)
#define ST7920_DELAY_2 DELAY_NS(63)
#define ST7920_DELAY_3 DELAY_NS(63) // this is the defaults for a 16mhz processor (ie a mega2560)

Works perfectly. Thanks.