Factory screws Ender 3 LCD PCB cover with key fitting for backlight On/Off
thingiverse
Ender 3 LCD PCB cover with key fitting for backlight On/Off. Used switch is the KCD1. Used resistor is a 150 Ohm 1/4W resistor (you can use any value between 68 and 250). On the ender 3 pro PCB you need to remove the resistor R14 (68 Ohms) and instead solder 2 wires that will connect the switch and the resistor in series (the last two images can help). I recommend using hot glue for insulation and mechanical strength. Ps: sorry for the bad english.
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