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sainsmart display problem just squares and sc not working have I missed somthing?

Dave in Spain

sainsmart display problem just squares and sc not working have I missed somthing?
November 02, 2013 06:18PM

Registered: 10 years ago
Posts: 8

everything seems to be working on my 2560r3 and a4988 exept the display, it powers up but only see squares, and sd card will not read, any ideas

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T0mmm

Re: sainsmart display problem just squares and sc not working have I missed somthing?
November 02, 2013 07:51PM

Registered: 10 years ago
Posts: 86

the squares etc could be caused by electrical noise picked up from nearby stepper motor wiring or the power leads.
try to separate the signal wires to your LCD screen from the stepper wires, or consider using screened cable to the LCD.
Also keep the wire lengths as short as practicable smiling smiley

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Anonymous User

Re: sainsmart display problem just squares and sc not working have I missed somthing?
November 03, 2013 04:02AM

If it a character display then the contrast pin voltage might need adjustment. If it is a long way off then you just get squares.