Fixing poorly documented BTT TFT 3.5 issue: Backlight but no startup

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  • BIGTREETECH-TFT35-V3.0

    TFT35 V3.0 is a medium size, dual-mode, ultra-clear 3D printer display and it is designed by Bigtree Technology co.,LTD. It is an excellent replacement for the standard 12864 LCD displays.

    • So just to put this out here so I don't feel guitly for keeping this solution for myself, I had some problems with my SKR V1.4 Turbo and I shorted out the pins for the heater on my extruder. I don't know the exact details but this resulted in my display not booting up anymore: It just went black, you could see it was on and the red LED was functioning aswell (D2) but D1 was off. After looking through some files on the github of the THT 3.5 (https://github.com/bigtreetech/BIGTREETECH-TFT35-V3.0) I came to the conclusion no one has documented this problem, so thought this'd be the right place for it. You can simply solve this issue by shorting the D1 with a 680 Ohm resistor - after this the display will boot and ask to select a mode (Marlin or "Modern"). Cheers!

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