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LCD won't turn on after step 3 of preflight check  

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tqian.lucy
(@tqian-lucy)
New Member
LCD won't turn on after step 3 of preflight check

Hi,
After following the manual for Original Prusa i3 MK3S Kit and reaching step 4 in preflight check, 
I connected the power cord and toggled the switch in an attempt to power on the printer.
The LED on the PSU lit up (picture attatched), which I assume meant that there is power coming in, but my
LCD won't power on (picture attached).
I unplugged the power supply and triple checked all my connections (pictures of power pins + LCD connections attached), 
checked that none of the fuses are blown, and then powered on the machine again.

In other help posts, people mentioned hearing sounds of the fans/ buzzing upon startup, but even if my LCD
is somehow broken, i couldn't hear anything coming from the printer. 
I don't currently own a multimeter, but the power should be supplied from a 120V socket.
Is there something else I should be checking? or some switch I potentially missed?

Thanks!

 

This topic was modified 2 years ago 2 times by tqian.lucy
Posted : 26/04/2020 3:53 am
kugel
(@kugel)
New Member
RE: LCD won't turn on after step 3 of preflight check

Hi there!

I had the same issue and read on

https://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller

that

  • Some versions of this board have the notched connectors the wrong way around. If your controller only flickers and beeps, cut off the notches on the cables and insert them upside down.

 

Comparing with the picture in step 6.3 of the assembly guide this is the case on mine. The red stripe of the cable is on the card reader side in the guide and it was the other way around on mine. I turned the connectors around and now the Display lights up at least. However, nothing more happens so far.

Cheers

Nikolai

Posted : 09/05/2020 2:16 pm
kugel
(@kugel)
New Member
RE: LCD won't turn on after step 3 of preflight check

Update: I can actually move the z axis by blindly clicking and moving the encoder/rotary switch. The Display does not show anything.

Cheers

Nikolai

Posted : 09/05/2020 2:33 pm
kugel
(@kugel)
New Member
RE: LCD won't turn on after step 3 of preflight check

I found the solution in the reprap forum:

https://reprap.org/forum/read.php?13,448609

Cheers

Nikolai

Posted : 15/05/2020 9:22 pm
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