12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 08:57AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 09:56AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 11:05AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 11:29AM |
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Quote
AuriuX
End stops connected corectly. its a new printer build, didint print anything yet. all the axis goes home fine.
If the ramps would not make a proper contact, then i think the screen wouldnt show anything on the lcd all the time. Now when i plug the usb to the pc, the lcd shows all the info, i can control everything from the lcd.
No PC - no LCD
Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 11:32AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 11:57AM |
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dougal1957
Have you installed the Diode (D1) underneath the X and Y axis Driver boards (It is half under each of them)? It is this that allows a 5V feed to the Mega when the USB Is disconnected.
Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 12:07PM |
Registered: 9 years ago Posts: 1,159 |
Quote
AuriuX
Quote
dougal1957
Have you installed the Diode (D1) underneath the X and Y axis Driver boards (It is half under each of them)? It is this that allows a 5V feed to the Mega when the USB Is disconnected.
Will check the board for a D1 diode when i come home. Hope i find no diode there, just an empty space.
Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 02:45PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 30, 2014 10:12PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. October 31, 2014 07:38AM |
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Dust
There have been a bunch of new boards that the connction from the end of the diode to the mega pin is broken.
With a multimeter check you have connection from the left most leg of the diode to the vin pin on the mega
Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 01, 2014 01:50PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 03, 2014 02:18AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 03, 2014 09:55AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 03, 2014 08:35PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 03, 2014 10:38PM |
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Quote
Cefiar
It's a regulator device like a transistor (3 leads on side, 4th lead is the tab).
There's a bunch of variants, and one is 5.0 (5V) and the other is 3.3 (3.3V).
On a Mega, it's usually between the barrel connector and the USB socket.
Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 06, 2014 06:48AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 17, 2014 05:54AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 18, 2014 08:53AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 18, 2014 03:03PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 19, 2014 05:25AM |
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Quote
dc42
The Mega's voltage regulator is very likely working but overheating due to the current drain and going into thermal limiting mode. In particular, the back light on the 12864 needs quite a lot of current. Also, some 12864 displays have the back light series resistor built in, while others need an external series resistor.
I recommend driving the back light through a suitably large series resistor from the 12V supply, so that it doesn't add to the power dissipation in the 5V regulator. From memory, I think the backlight of a 12864 is rated at 100mA and it drops a little less than 4V. So a 100 ohm 1W series resistor should be about right. Or about 200 ohm 0.5W if you are OK with lower brightness.
Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 19, 2014 11:10AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 19, 2014 06:55PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 22, 2014 08:45AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 22, 2014 10:47AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 22, 2014 07:00PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 23, 2014 12:26PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 23, 2014 03:43PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 23, 2014 07:42PM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 24, 2014 07:36AM |
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Re: 12864 Smart LCD with RAMPS 1.4 Strange behavior. November 24, 2014 08:02AM |
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