so this is a rep report controls so these are as it says right there 128 by 64 pixel liquid
crystal displays and they also have on the back an SD card and you've got your two connectors
here exp one and exp two and I got one of these with the rumble board that I ordered and I could
not get this thing to work and so I thought I might have a bad controller so I thought well
let's get a second one and the second one does exactly the same thing the push button on the
rotary selector will make the screen beep and the back light flashes on and off every once in
a while but it doesn't display anything and the problem is see the notch on the connector and
there's the notch on the silkscreen and you can see how this connector I have the notch on the
top at the suggestion of one YouTube video I saw they finally explained what was going on so this
silkscreen is wrong the connector number itself is correct the silkscreen showing the position
of the notch is wrong so let me show you how to swap those it turns out it's not that hard what
you need to do is get some needle nose pliers and you want to work on alternate ends here you
want to stay away from the pins because you don't want to bend the pins and so you just get in here
and you have to put your thumb kind of down on the circuit board because there's nothing supporting
the circuit board here in the middle so you got to pull there and pull okay you can see how I've got
that connector up a little bit it takes probably a couple of minutes because you can't pull it very
far because the the connector shell will rock on those pins so yeah here we go let's see if
we can work a screwdriver in there just does a show you the connector shall move in there you
can kind of work that in a little bit I guess yeah that that actually works pretty good so you just
want to go a little bit on one side a little on the other side so there we go got the connector
shell right to the top and then what you want to do is flip it over so the notch is up on the top
this is where you got to get all ten pins back in the holes make sure they're all in there and
then you want to slowly push that back down so there you go you can see how it got all the pins
started and then you're down flush back down there so I got both notches to the top in that way you
don't have to modify your ribbon cables because the ribbon cables having a little bump on them
that has to fit into that notch so this is the LCD connection this is your SD so the the connector
next to your SD slot is for the SD and then this one you can see all the traces come over here
and I guess that's where the the controller for the LCD screen is so let me go plug this in and
I'll bring you back with the rhumba controller and we'll see if this thing works okay here we
go youtube I burned the Marlin firmware into the rhumba board here and this particular board does
have the connector shells on it and this one is labeled exp one that's exp two so on this board
the connectors are labeled correctly that's exp one exp two number two is closest to your
SD card and plugs in over here you've got the redline on the cable to this outside here but
I've got the notches on these connectors flipped over 180 degrees so the notches are on the top
of the board as you look at it so I've got a 12 volt lithium battery over here for power now if
you watch right here there's an LED right next to this connector and if you watch that when I
turn on the power that's showing that it's communicating to the liquid crystal display
so that works one thing I'm gonna have to do is the dial here is backwards because normally if
you turn it clockwise it'll go down this one you turn counterclockwise I guess I've got a switch
stay out and then it looks like the SD card is not responding there yeah I don't have the SD
menu I must not have compiled that in there so do fan speed yeah you can see if I go clockwise the
number doesn't increment if I go counterclockwise it does so let's see here's my parts cooling fan
yeah there we go you can see the fans running I can turn it down to zero and it goes off so now
I got to work on getting the SD card working but yeah that is the problem the silk screen shows the
connector shells installed incorrectly so you got to flip those over and that gets worked in
there but yeah that with the full graphics shows your fan it shows your bed temperature and then
I guess that's the extruder temperature you've got your X Y Z coordinate and then this would
be the where the SD card so I I still need to get that working so in the Marlin configuration dot H
file there's a definition for RepRap discount full graphics smart controller and you have to enable
that or uncomment that particular definition and then it'll compile in all that code and it
looks like it's pretty much working I got a few details to work it out there actually ended up
with two of these controllers because I thought the first one was bad so I picked up a second one
had the exact same problem I found a few notes that kept saying the connectors were wrong some
of them said these two are swapped so they'll say this is exp one that is exp two but on this board
I'd confirm that this was the graphics or the LCD connector these two are the same the numbers line
up but the pin assignments don't so your your red wires are to the side that the SD is on not to the
other side and it decoded all the various comments you find dozens of comments you know some people
Oh mine worked fine mine doesn't work I tried this there was one guy that said he shorted a
couple of these pins together and got it working somebody else said they flex the circuit board
because I guess some of these these interconnect pins here go through connectors like a pin header
and a header connector the two boards I have are all soldered I looked at him under a magnifying
glass and couldn't see any obviously bad solder joints and I tried flexing the two boards and
doing a bunch of stuff nothing seemed to help but anyway we got that working mostly I got a
few little tweaks to do to it yeah I'll need to look at how this one works versus how the 20 by
4 alphanumeric display works see which one is is better if there's any advantages I know the other
one it's a bigger display but then this one they can pack more information in with graphics rather
than numbers because you pretty much get the same thing though there was Rumble ready you had this
SD card percentage you had your X Y Z and then you had your temperatures up there on the top so four
lines I guess all their menus are set up for four lines anyway just you get a little a little nicer
looking menu you know with pictures rather than text but yeah thought I'd show you that working
looks like it's all up and running I've got something working now that's that's the important
part I got to get the SD working I got to get the direction and the sensitivity set up there and get
the rest of things going but other than that I think it looks pretty good thought I'd show you
the full graphic smart controller running there that's the way to get that working switch your
cables around so yeah if you have any questions about that post up in the comment section below
and I'll put any future follow up videos over on the left side and as always thanks for watching
you