Hi guys. First time build here and am running into some weird firmware/control issues. I am Using a SKR 1.2 Pro board with TFT35 E3 V3 and am having two problems the first is with the TFT35, when the screen comes up it says “no printer attached” so I have adjusted the baud rate to 250k still no connection. I have reloaded the firmware a few times with no results. On top of that it wont open in Marlin mode just gives a message saying something about simulation. I have also triple checked wiring and everything seems correct.
The second issue is when connecting to the PC running windows 10 and Repetier host. At first it kept trying to connect to COM5 and I read somewhere that the firmware is set to COM1 so I changed the number of the COM port to COM1 and connected fine. Even got to move my steppers around a bit. I then reset the board to work on getting the screen to work and now it says I dont have access to COM1 and nothing I do is helping (changing ports, set to auto, unplug/plug back in, reboot PC, etc.)
The firmware I have loaded (both from V1 github):
V1CNC_SkrPro_Dual_2209-2.0.7.2-src
BIGTREE_TFT35_V3.0_E3.26
The other reason I’ve seen for the “No Printer” message is that the cable is plugged in backwards at one end. Try rotating the cable 180 degrees at one end. As for the COM1, I’ve never reassigned a COM port. I just pick whatever port the devices is on.
Specifically the black cable with the single separate pin. I had the same and this resolved it. Are the LEDs on your screen solid red our blinking like crazy? If they’re blinking like crazy like mine were that’s your serial data going to the wrong place! Cheers!
Try just removing the grey cables. The are for Marlin mode, which does say simulation when starting it. For touch screen mode you only need the 4+1 pins. That’s how I’m running mine, no grey cables.
I want both options, thats why I got this screen. Touch screen works fine but still no connection to the printer. Marlin mode will not leave the simulation screen.
I did fix the communication issue with Repetier host though so I can run headless.
Consider this a debug step. If touchscreen works with the grey cables gone and you can connect to the printer, you know the grey cables are where to focus your attention. Easy thing to try. If it doesn’t help, then of course more debugging is required.
Nuts. Mine had a problem that it didn’t like the microSD that came with the SKR. If I had it inserted, no connection to printer. With it removed it connected every time. Worth a look.
It does say V1 when it boots. In Marlin Mode it won’t move past the simulation message. I read somewhere that this means there is a communication issue. At this point I have tried every wiring configuration, swapped out the ribbon cables, re-flashed the firmware (different versions), swapped SD cards, and re-flashed the control board (SKR Pro). Now I’m wondering if the SKR firmware is the issue or if the TFT35 is trash. I will get to test both soon as I have another TFT35 on the way for my 3d printer.
I figured out the Repetier Host issue. Turns out Windows was using COM1 for my mouse dongle. Got connected and was able to move all my axis. Until I got a zlimit triggered issue. my end stops triggered fine but the max end stops didnt show up which leads me to believe I don’t have the correct firmware.
Got it sorted out. Thanks for all the input. Turns out when I flashed the dual endstop firmware it didn’t take so I was running the stock firmware. Hints why the x2 and y2 min didn’t show up when I entered M119 command. I could not get the firmware to flash until the TFT was completely disconnected from the board. Once I flashed the firmware I re-flashed the firmware for the TFT and it connected right away. Now on to the obligatory crown.