I’m working on an Ender 3 at school, a relatively new one. While trying to install a TL smoother and removing the hot glue on the mainboard, It starts making a long beep. I turned it off. Then, after finishing installation, I turned it on.Another long beep. It keeps on doing that.
Turn off the printer and inspect the thermistor on the hotend, usually this error is caused by a loose or incorrectly seated thermistor sensor.
ok. Also, the LCD doesn’t do anything other than light up.
If you are unable to locate a loose connection or faulty part I would recommend contact support to see if they can assist you. You can contact them via live chat, facebook or email cs@creality.com
Voltage setting correct…? 
Last time I checked, yes.
inspect the thermistor on the hotend,
I did replace the hotend (nothing else) so maybe something went wrong?
I’m curious if you figured out what was wrong. I’m experiencing the same issue.
After printing a few prints since I got my Ender 3 v2 Neo it suddenly started giving me low temperature warnings any time I tried to print. I changed out the hot-end and put in a new thermistor. Same problem. Then I saw a post about checking the voltage setting on the power supply. After taking the power supply out and checking the voltage switch I was stunned to find it set to 230 v !! (I’m in the USA which is 110-120). Seriously?! After setting the switch to 115 I no longer have any problems. I can’t believe Crealty send out these units without checking the voltage.
FYI, All printer manufacturers that ship globally set the voltage to 230v. This is for safety reasons. If you plug it in, in the US and the switch is on 230v the worst case is it doesn’t work properly until you switch the voltage to 115v as pointed out in all setup manuals. If someone overseas plugs in a printer to a 230v outlet and the voltage is set to 115v then the outcome would be more damaging and potentially dangerous.
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