printer not working after changing circuit board

[appswert]

Hello Nutts,

first of all be very carefull when doing any of the following steps. Avoid getting close to high voltage (220V / 110V), only work on the low voltage side (only gt2560).
If you are unsure of anything mentioned don't do it and ask in the forum.
And for extra savety you should have an Residual-current-device
https://en.wikipedia.org/wiki/Residual-current_device.

I'm not working for Geeetech and this should be regarded as informative only...

Never touch High Voltages or you risk an possibly deadly electrick shock.

the best way to troubleshoot is probably to.

1) Visually inspect the backside of your gt2560 pcb for bad solder joints:
https://learn.adafruit.com/adafruit-gui ... n-problems

Now have a look at the schematic of your gt2560 board:
http://www.geeetech.com/forum/download/file.php?id=532
(can be also found here: http://www.geeetech.com/forum/viewtopic ... 18&t=16259)
It may help you down the road.

2)
Have you accidentally swapped SD-Card-reader and LCD-screen connectors?
Check that now...

3) The LCD-Backlight lights up even if there is not enough voltage delivered or generated on your gt2560.
So disconnect everything from your board except your powersupply (atx-like-plug) and your LCD-screen to eliminate the possibility of an short circuit somewhere else (like 12V for pwm fan...).

If you have a multimeter you can check if you power supply generates the requiered 12V (or something withing +/- 0.6V tollerance)
NEVER check this on the powersupply side, meassure it at the atx plug/socket even if it seems difficult. Mains Volage will be at the PSU!
(If you don't know what exactely to do here, don't do something and reply...)

Check if the green LED's next to the 12V plug light up (for 5v power generation).

If you have a multimerer check if there is 5V next to the atmega-processor with the 5V pad
(Same here... if you don't know what exactely to do here, don't do something and reply...)

3)
Try to raflash the firmware:
Flash it with arduino IDE and make sure somewhere down in the Configuation.h you have the line which enabeles your display board uncommented.
For me this was:

//
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_F ... Controller
//
#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER

But check if you have this display first.

[nutts]

Ok Thanks for your guide.
I have done the checks that you asked for, and everything looks good and checks out.
What I am not sure of is how to flash the firmware.
I have reloaded it a few times but nothing changes and the printer is still dead
The LCD screen is showing printer info but still not allowing any adjustments
The heatbed is working and the Extruder is heating
But still no motor control at all

[nutts]

I have downloaded Easyprint and installed it.
But printer is still dead other than the heaters they seem to be heating alright

[appswert]

Ok Thanks for your guide.
I have done the checks that you asked for, and everything looks good and checks out.
What I am not sure of is how to flash the firmware.
I have reloaded it a few times but nothing changes and the printer is still dead
The LCD screen is showing printer info but still not allowing any adjustments
The heatbed is working and the Extruder is heating
But still no motor control at all

If the LCD shows status information your printer is definetely not dead
Maybe the adjustment knob is not working...
Does the little percentage icon on the bottom left change if you turn the knob?
What happens if you press it (inward)?

You can try if your printer is responding to commands which you can send with the arduino terminal.
In the Arduino IDE I think it's called serial monitor or terminal. I'm sure you will find it.
Make sure you select the right com port first.
Then connect your printer with an usb cable while having power, lcd, motors etc. all plugged in.
If you see strange characters try to change the baud rate. It was 115200 or 250000 if I can remember corectely.
Now you can send G codes with the Terminal to your printer.

Try to send "M119" which should let the board report the endstop status.
Does this work?

And I think your printer uses a different lcd panel if you have the acrylic one...
Maybe this is also part of the problem (I think your lcd is called "Smart LCD 2004")
It could be that the configuaration for the knob is incorrect and that could cause that it's not working.

So if your printer responds to terminal commands I suspect this is the problem...

[nutts]

Sorry but no joy
The baud rate is 115200
Still no response from printer
I think the baud rate used to be 250000
The LCD when you push it in jumps to the next screen but nothing else and turning the knob does not change the %

[appswert]

Sorry but no joy
The baud rate is 115200
Still no response from printer

And turning the know doesn't make a difference too?

Ok I'm testing it with my gt2560 and Arduino IDE now and I get a response at 250000 baud...
But the speed might depend on the flashed firmware...
Try to reset/reboot your gt2560 while watching the serial monitor. At least for me it spits out many messages.
Do you have the right com-port selected?
And is your board even recognized by your computer (Does a new com in arduino ide appear/disappear if you plug your board in/out?

And do you see a change on your display if you insert an sd card?

[appswert]

Ok Thanks for your guide.
I have done the checks that you asked for, and everything looks good and checks out.
What I am not sure of is how to flash the firmware.
I have reloaded it a few times but nothing changes and the printer is still dead
The LCD screen is showing printer info but still not allowing any adjustments
The heatbed is working and the Extruder is heating
But still no motor control at all

Just that I get that right...
How do you controll if the printer should heat?
So maybe your motors are working but you are unable to controll them...

[appswert]

Sorry but no joy
The baud rate is 115200
Still no response from printer
I think the baud rate used to be 250000
The LCD when you push it in jumps to the next screen but nothing else and turning the knob does not change the %

Ok so I suppose the firmware on your printer is working and that we only have a problem with the knob...
This should be fixable with the right firmware if the knob used to work on your first board...

Have you tried to flash geeetechs original firmware?

[nutts]

My board is showing as a Arduino Mega 2560 or Mega ADK
And turning Knob does nothing
When turning printer on or off makes no change to the serial monitor

[nutts]

I have been using firmware downloaded from Geeetech for Geeetech i3 pro B
That is what printer is