TFT appears to communicate with SKR2, then returns to select touch/marlin screen

[hikerjohnson]

Hello,

I am working with a TFT35 V3 E3 that is connected to an SKR2 Rev B; all on a Creality Ender 3 Max. I have had this collection working in the past, but have recently redone the firmware to add a second Z servo.

Currently, I appear to have communication between the screen and board, and can select either Marlin or touchscreen mode, and will flash to the appropriate screen for a moment, but then everything returns to the select Marlin/touchscreen mode.

I believe my configurations are all correct per the documentation, and am not sure what to try next.

Please advise; config files and a video showing behavior are here:

https://drive.google.com/drive/folders/12XBUJzFbedkjUfIk8iVuxwUQiNC5DoGO?usp=sharing

[XeroZar]

Did you connect the cables correctly from the TFTto the board? (Send a pic pls). I'll look at your config file when I get home.

[hikerjohnson]

Board is a disaster, I know, but I need the printer going to print up a nice enclosure to tidy it...

[XeroZar]

No worries, I know the feeling... Did you disconnect anything when you upgraded?

[hikerjohnson]

Video of connecting EXP1 from the SKR to EXP3 of the TFT here: https://drive.google.com/file/d/1pthxOioo0t5YJ9O0K90cbX6owy7hX_zG/view?usp=share_link

I tried again, on a whim, lifting the reset pin on the RS232 cable, which made the display do some interesting things, but really I don't think it was a step forward. Can video if you think its useful.

[hikerjohnson]

The documentation I've been using is here: https://github.com/bigtreetech/BIGTREETECH-TouchScreenFirmware#connecting-the-tft-to-the-mainboard

I believe I read the connection table correctly for wiring.

[XeroZar]

Hmm, connections look fine. Ok just connect the tft connection, remove the 2 serial grey cables and tell me what happens. Also remove the bl touch.

[hikerjohnson]

Identical behavior to the first post - choice screen, flash to something that looks OK, then back to the choice screen.

[XeroZar]

Did you compile the firmware?

[hikerjohnson]

I'm not sure how to answer that - I used the marlin builder in VScode to crank out the firmware file.

[XeroZar]

Was this the original one or did you download from somewhere?

[hikerjohnson]

Do you mean the firmware for the control board or the screen? The screen is the latest files from biqu's github repository, and the control board is the latest stable marlin release

[XeroZar]

Both... ok do you have rev a or b of the skr 2 board... I don't see anything in the picture

[hikerjohnson]

It's a rev B board with the 429 processor

[XeroZar]

ok try the official BTT SKR 2 firmware, just use defaults to see if it works... https://github.com/bigtreetech/SKR-2/tree/master/Firmware/Marlin-bugfix-2.0.9.2.x

[hikerjohnson]

I'll give it a shot, may be a day before I get that done; away from the machine now. Thank you for the help!