printer not working after changing circuit board

[appswert]

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

I think you should try flashing the original firmware for your printer...

Here is a forum post on how to flash the firmware:
http://www.geeetech.com/forum/viewtopic ... 0+firmware
Here are all firmwares for all printers:
http://www.geeetech.com/forum/viewtopic ... 10&t=17046

Or to summarize it quickly:
1)Download the original firmware for your board: (If you have Prusa i3 pro b it should be:)
http://www.geeetech.com/forum/download/file.php?id=2819
2)Extrackt it and open the Marlin.ino file
3) Connect your board with USB to your computer, select the right com-port
4a) enter the settings of arduino IDE ( file->preferences ) and check "Show verbose output during" (check compilation and upload) so you can see what arduino IDE is doing...
4b) Hit upload and watch out for errors....

[nutts]

Could the problem be the Baud rate is to low ?
If so how do I raise it to 250000 ?

[appswert]

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

So you already sucessfully uploaded the original firmware?
Do you know if your reflash worked?

[appswert]

Could the problem be the Baud rate is to low ?
If so how do I raise it to 250000 ?

When you open the Serial Monitor on the bottom right you can acces a dropdown menu which let you select the baud rate.

But if your baudrate should be wrong there are normaly strange characters displayed.

Normaly if you see nothing than there is something wrong with devices drivers or the com port you selected was wrong.

[nutts]

Ok I think I did everything right and Uploaded and watched what it load and it went flashing bye on the screen real fast and did see some error flash bye in yellow
Checked the LCD screen and no changes

[nutts]

My baud rate will not go any higher 115200

[appswert]

Ok I think I did everything right and Uploaded and watched what it load and it went flashing bye on the screen real fast and did see some error flash bye in yellow
Checked the LCD screen and no changes

1) Does Communication with serial monitor work now?
2) The Knob issuse could be two things
A) Firmware problem / Missconfiguration
B) an electrical issuse
(Maybe a defective trace on your gt2560 from the lcd/knob to the atmega processor.

Did the Upload took a while (with an loading bar made of "#" ?)
Did it say oh the end of the log below the editor flash sucessfull?
If not than the flash was not sucessfull..

[appswert]

My baud rate will not go any higher 115200

Do you have the latest arduino IDE?
And the right com-port selected?

[appswert]

My baud rate will not go any higher 115200

Alternatively you can use any other serial monitor
Foe example "putty"

[nutts]

I did not see anything like you have on your screen