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Increase in the number of issues seen on LCD Screens
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Description

In general I feel like seeing the LCD screen fail isn't normally a very common problem and in the last 2 weeks we have seen 4 RMA's created for issues with LCD screens that seem to malfunctions of the screens themselves. I have included the specific information about each of the failures we have seen so far.

RMA 1: LCD just stopped displaying anything, we verified the fuses were good and checked wiring so this looks like possibly a faulty LCD. This one is coming back so we will be able to confirm if the LCD is the root of the issue. (ID: 190,246)

RMA 2: LCD Screen had a line through upper portion of screen where nothing would show up. It sort of looks like it was damaged causing that area to not be able to project anymore, but it could also be a glitch. (ID: 199,310)

RMA 3: LCD Screen was functional for a while but over time the display started to fade, it is now totally blank but if the knob is used it still responds with the normal sounds like it is functional. (ID: 197,860)

RMA 4: LCD Screen will flicker rapidly between screens until the knob is clicked to pull up the menu, then it will behave normally until the knob is clicked again at which point it goes right back to switching between screens in a very glitchy manner. (ID: 199,728)

This ticket is to get it on peoples radar so we can try to keep an eye out and see if this is a manufacturing issue of some sort.

Related Objects

Event Timeline

We did recently switch to a new supplier for the LCDs, so we should probably start with determining if these were from the new or old supplier. Do we have serial numbers for these machines in order to determine that?

We sure do!
KT-PR0041NA-29374
KT-PR0041NA-30431
KT-PR0041NA-30239
KT-PR0041NA-31533

@bowman do you have the serial number of the printer where we switched from RRD to ultimachine?

@adam it was at s/n KT-PR0041NA-31341 when we started.

We had another RMA for an LCD screen issue come through, serial number: KT-PR0041EU-28127
It seems like most of these are from RRD. I will continue to update as I see them.

logan changed the edit policy from "All Users" to "LulzBot Hardware Products (Project)".Jul 1 2019, 2:11 PM
logan removed a project: Redgum.
DaniAO added a subscriber: DaniAO.Jul 1 2019, 2:12 PM

going to remove redgum for now as it's not effecting them. We can always add it back should we see any problems.

logan added a subscriber: logan.Jul 1 2019, 2:12 PM

Redgum will be built with Ultimachine LCDs so I don't forsee this being an issue for Workhorse and have removed the redgum project from this ticket.

oliver added a subscriber: oliver.Jul 19 2019, 10:56 AM

@DaniAO Mini 2 is being build with the Ultimachine LCDs as well and as far as I have seen, this is still an issue that crops of with them as well. There is another ticket in the workmanship standard project specifically for dealing with issues for the Ultimachine LCD (T6452).

Do we want to add Redgum back to this ticket or close this ticket and post issues onto the previously mentioned ticket?

@Galadriel @oliver how many are we seeing? is it all the time? Is it once in a while? Have we seen this issue on redgum yet?

@DaniAO It isn't super common from what we have seen in TS, common enough that it bore mentioning, if I ranked the issues we run into based on frequency we get asked about in TS I would place it at around spot 20-25. @oliver may have a different opinion on that from the production side of things though.

@Galadriel 20-25 total? Between which machines?

@DaniAO Sorry I should have been clearer in what I was trying to say, if I was making a list based on the frequency with which we see specific issue (think billboard top 100 list) then I would rank issues with the LCD as falling at around spot 25 on a list of the top 100 issues that we see in TS. That calculation takes into consideration all the printers that have this type of LCD screen.

While it is possible this could affect Redgum, I'd like to keep it off of that board until the issue is reported on Redgum in the field.

@oliver When you say this issue crops up in production, which issue(s) specifically? AFAIK every LCD gets tested before it gets installed into any assembly. So we would need to know what the issues are that are coming up, that haven't already been addressed with the supplier, for only Ultimachine LCDs, and find out why they aren't being caught pre-assembly.

@DaniAO @logan These are tested at 100% in Electromechanical before and after being put on the chassis. With the double checks we are still seeing instances of issues cropping up on these screens in calibration. Whether its a defect in the assembly or improper handling we do see instances crop up on the ultimachine LCDs and any printer that uses them (though I think the Taz 6 had the larger amount and so the redgum may be more susceptible.) As for how frequent, I cannot say as I havn't been in charge of red tags for awhile but they do seem to happen a lot less frequent than they did with the reprap lcds.

My point is that these I believe are more issues with the LCD and not any individual printer.

@oliver how many is related to vendor issues and how many are related to improper handling? If it's more on us, then we need to determine better handling methods in house.