Defective A4988 Module, Control Board, and LCD

[zhangxueyou]

There are no letters or black squares. Turning the resistor pot had no effect.

Please swap 2 wires on LCD which are connected to mainboard.

[Viziwizard]

I swapped the wires and made the adjustments with the resistor pot and now I have a series of black boxes on the LCD screen.
But I cannot control the broad with the reset or selector switch.
As well, the software does not communicate with the control board.

[zhangxueyou]

What is your mainboard type?

[Viziwizard]

My Main board type is the Sanguinololu V1.3A assembled

[zhangxueyou]

My Main board type is the Sanguinololu V1.3A assembled

Did you change anything of firmware?

[Viziwizard]

No, I did not change anything with the firmware. I just assembled the unit and started it up.
That is when the module started smoking.
Nothing has worked from the beginning.

[zhangxueyou]

If you want to connect the software(Repetier) to printer, you should choose correct baud rate(250000) and correct COM port.

[Viziwizard]

I have done that correctly. Believe me, I have done all that I possibly can to remedy the situation.
I am not a novice and have reviewed your materials seriously and thoroughly.
If there is a problem it has to be defective components.
Please give the okay to send all the electronics to me.
I have been in constant contact with the Foreign Trade Manager and she is just awaiting your okay.
Here is her last response to me:
"I checked our forum again and found our technical colleague have replied you, can you pls have a try?
Then I will confirm with them on Monday, we will send all the parts need to replace to you."

[zhangxueyou]

I have done that correctly. Believe me, I have done all that I possibly can to remedy the situation.
I am not a novice and have reviewed your materials seriously and thoroughly.
If there is a problem it has to be defective components.
Please give the okay to send all the electronics to me.
I have been in constant contact with the Foreign Trade Manager and she is just awaiting your okay.
Here is her last response to me:
"I checked our forum again and found our technical colleague have replied you, can you pls have a try?
Then I will confirm with them on Monday, we will send all the parts need to replace to you."

Hi, I can't find any record of sending you the firmware. Sorry, I want to know, did I send you the firmware before?

[Viziwizard]

I assumed that the firmware was already burned on the chip.
If it wasn't, send the firmware to me and the method of installation.