Can't print with USB/firmware doesn't load

[Dargu]

I tried searching but didn't quite get my specific problem.
I first got my Rostock MAX up and running on Monday, and I could print from my computer just fine. Tuesday night I finished soldering the LCD to RAMBO board (I somehow missed that step right up until the guide said to plug the LCD in, and I had nothing to plug it into ).
Since then I can print from the SD card fine, but shortly after I got the LCD working I haven't been able to print (or even fully connect) from the USB.

When I press 'Connect' in Repetier it switches to the green power button/disconnect and seems to think it is connected but it can't quite get the firmware. (I believe the M115 command is failing)
Then when it tries automatically get a temperature reading (M105) it spits out "wXZWH? wait".
While this is happening no other commands work.
Attached is a copy of the log if that helps.

Misc. useful information:
Repetier-Host V0.95F
Windows Vista
"Device Manager' still recognizes the printer in COM 4 (same one as always)
I have tweaked print/printer/filament settings in Slic3r but not in Repetier
I did have some prints come loose that I had to kill from the LCD screen.

That's all the information I have right now. Thanks for any help.

[Eaglezsoar]

More information is needed. Your printer worked fine until you soldered the LCD to the Rambo Board?
Then the problems started. The only soldering that should have been required was the soldering of the headers
to the small adapter board. The board plugs into the Rambo and cables connect the LCD to the adapter.
Since the problems started when you soldered something we need to understand what the something is. We would need some
pictures to properly understand what you did and how you did it. Can you send some pictures?
Use the upload attachment button to choose the pictures and send them after you get them.

[Dargu]

I didn't phrase that right. The problem started shortly after I soldered the small LCD to Rambo adapter board. (the LCD is plugged into the adapter which is plugged into the Rambo board, as shown in the manual.)

I could control the machine from my computer once I had the LCD hooked up and working. I believe it was after a few prints from the SD that I could no longer connect with the USB.

[Eaglezsoar]

I didn't phrase that right. The problem started shortly after I soldered the small LCD to Rambo adapter board. (the LCD is plugged into the adapter which is plugged into the Rambo board, as shown in the manual.)

I could control the machine from my computer once I had the LCD hooked up and working. I believe it was after a few prints from the SD that I could no longer connect with the USB.

Okay that makes more sense. I would power off the machine and pull the adapter off the Rambo and remove the cables noting where they were and the direction of the red wires.
Take a magnifying glass and look for pins that you may have missed soldering or pins that look like they have a solder bridge between them.

[Dargu]

All the pins are soldered and none of them are bridged together.

Without the adapter attached to the Rambo the problem still exists.
After checking the adapter and plugging in the LCD again, the problem still persists.

Now I guess I didn't think of this until you mentioned to look at the adapter, but the first time I plugged in the LCD I got the ribbons backwards (A was in A and B was in B, but the red stripe was on the left for both instead of on the right). When I turned/pressed the knob, it clicked at me like usual, but nothing was displayed on the screen. Could reversing that polarity be the cause of my problem?

Also when I just turned on the LCD I noticed that on startup it said "Repetier 0.83". I am running Repetier 0.95. Could this also have something to do with my issue?

(Sorry if I am flooding you with useless information and/or giving false leads. I am better at diagnosing mechanical problems and electronic hardware has never been my thing, so I am not sure what information is relevant and what is not.)

[Eaglezsoar]

First lets take a look at what shows up on the LCD when you first connect. You said: Also when I just turned on the LCD I noticed that on startup it said "Repetier 0.83". I am running Repetier 0.95. Could this also have something to do with my issue? You are running 0.83 version of the Repetier firmware. You are also using version 0.95 of Repetier Host. I think that
is part of your confusion but what it says is what it is supposed to say. The fact that it says that on Repetier Host shows that it is communicating with the Repetier firmware.
When you first turn on the printer and computer and go into Repetier Host and push connect you should see on the Repetier host screen the communication between Repetier Host
and the firmware on the Rambo that's when it displays version 0.83 for the Repetier firmware. If you see that information it sounds as though Repetier Host is communicating with
the firmware and at the correct baudrate. Go into Manual Control. What happens when you manually jog the motors? At the very bottom right are you sure that it doesn't show that it is in dry run mode? Can you enter a temperature for the extruder and turn the extruder on and it starts heating? The same for the Heat Bed. Can you enter a temperature and turn it on?
At this point answer the above questions so we can determine if your computer is communicating properly with the Firmware.

[Dargu]

The fact that it says that on Repetier Host shows that it is communicating with the Repetier firmware.
When you first turn on the printer and computer and go into Repetier Host and push connect you should see on the Repetier host screen the communication between Repetier Host
and the firmware on the Rambo that's when it displays version 0.83 for the Repetier firmware. If you see that information it sounds as though Repetier Host is communicating with
the firmware and at the correct baudrate.

I don't see the 0.83 in in Repetier Host. Only on the LCD screen.

Manually jogging the motors does nothing.

Heating the extruder or the bed does nothing. They have a reading in Repetier Host of 0 C. (thermistors are working because on the LCD the temperature reads as 19.8 and 20)

The machine is not in Dry run mode.

Attached is a screen shot for clarity. (at the top of the screen is where I get the 0.95F for Repetier host)

[Eaglezsoar]

Your Repetier Host is not talking to the Rambo firmware which is usually the result of a mis-matched baud rate.
On the LCD there should be a setting that says configuration, go into it and find something that says baud rate it should be at 250000
Once you verify the number open Repetier Host go to config - Printer Settings and see if the baud rate is also 250000 if it is not 250000
change it so it is then apply it and save. You may have to reboot the computer open Repetier Host and see if it now connects to the firmware.
Let me know.

[Dargu]

Baud rates match. I even tried changing both to 256000, still no luck.

[Eaglezsoar]

There are only a few possibilities left. I really thought the baud rate in Repetier Host would have been wrong.

You indicated that it prints from the LCD SD card so most of the Rambo circuitry is fine.

You can go into your computers Control Panel - System - Device Manager and make sure that the
Rambo driver is still there and set to the correct Com port (I believe you said it was 4)

You could have a bad USB cable

It could have a bad USB interface on the Rambo board although I do not know how that could happen.
There have been reports that a shorted thermistor blew out the thermistor port and the USB port but
you did not say you had a shorted thermistor.

If the Rambo USB interface is dead, the Rambo can be repaired by Ultimachines.com ( they make the boards) you would have to communicate with them about sending
the board to them.

I'm sorry but those are the only ideas I have. Putting on the LCD cables backwards happens all the time and no reports of damaging anything.

Please let me know what the outcome is of this. That's how I learn and how I can help other users. If you have the finances you could buy a new Rambo and get this one
repaired. I truly am sorry this happened to you, I know that feeling of emptiness in the stomach from this happening.