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Thread: Garbled LCD screens
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05-27-2015, 12:33 PM #1
Interesting. Be sure to report back after a while to confirm whether or not the series termination resistors solved your garbled display problem. I'd try the fix myself, but I've eliminated the nibble transfer display as part of migrating to Smoothieboard on my i3v.
Technically, the bulk of the benefit is likely obtained by adding the termination resistor in the E signal line to the display. IIRC, that is the signal that is pulsed to latch each nibble data transfer into the display module. Ringing on any other pins likely wouldn't matter as long as they're stable when the E pin is pulsed, but there's no reason the termination can't be added in all the data lines. Also note that some of the data lines (encoder, SD reader) on the two cables are driven by the smartpanel and not the ATMEGA2560.
I don't really think that the screen get garbled due to timings or ESD.Last edited by printbus; 05-29-2015 at 11:24 AM.
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01-03-2018, 03:15 AM #2
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Printbus and ESS, I cannot say thanks enough to you both. I had already shielded the LCD ribbon of my ANET A8 but the screen still failed once every 3 min or so. I then installed only one 47 Ohm resistor directly on the LCD PCB in serial of the ENABLE signal and combined with the shielding connected to ground, it's now working very very well.
I have not yet the feedback over a long print but definitely it helps a lot.
But ENABLE+47Ohm alone or shielding alone is not enough (for me)
ANET_LCD_solution.jpg
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