Korg Forums

Adri-L · Joined: 08 Jan 2021 Posts: 8

Hi guys,

hope somebody had experienced this before. Last night the touchscreen of my Kronos LS mirrored and rotated itself out of the blue and ofcourse it happend during a gigi. A restart does not do the trick it stays mirrored and rotated.

Only the screen is rotated and mirrored, the touch spots are still on there original place.

Is there a way to fix this?

average_male · Senior Member Joined: 07 Feb 2011 Posts: 278

interesting... have you tried recalibrating the touch screen? It may re-initialize the monitor orientation.

To get into that mode, looks like Global => <Enter>
(holding down ENTER then press 3)

https://www.youtube.com/watch?v=_Rv63-oa3hg&ab_channel=ztempa80

McHale · Posted: Thu Sep 15, 2022 5:54 am Post subject:

I'd recommend opening it up and verifying all of the connections are good and tight. A loose connection inside could cause something weird like that.
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Xenophile · Senior Member Joined: 14 Nov 2017 Posts: 349

That's a weird one.

Now you will have to play your keyboard from underneath while standing on your head.
https://youtu.be/s0iH5iNSDMY

Adri-L · Joined: 08 Jan 2021 Posts: 8

Adri-L · Joined: 08 Jan 2021 Posts: 8

voip · Platinum Member Joined: 27 Nov 2014 Posts: 3773

It is almost certainly a display issue. Most displays of this type have a number of operating modes, including orientation mirror and flip, and it is likely that the mode setting, which might be set by internal pin connection, or bits set in a PROM, is being misread because of a fault.

Get it replaced by Korg Service.

.

average_male · Senior Member Joined: 07 Feb 2011 Posts: 278

Is the boot screen also flipped/mirrored?

Adri-L · Joined: 08 Jan 2021 Posts: 8

Yes, that is also flipped and mirrored.

And now I got another problem. My touchscreen broke last night and I did a Full reinstallation of the software. Now I cant put my backup back on the Kronos either. I'm am really screwed now.

KK · Platinum Member Joined: 13 Oct 2016 Posts: 1422

Sorry to read about your mishap. Did you have anything plugged in the USB ports when the problem started during your gig ? Looks like either the LCD screen (UMSH-8420MD) has failed or its control PCB (KLM-3360 if your model is a K2). There is also the LCD PCB who could have failed (KLM-3007). In any case, you will likely need a qualified tech as it's not an easy DIY repair.

soarsco · Joined: 29 Jun 2021 Posts: 27

That is pretty crazy. I think your best bet is to send that picture to Korg and see what they have to say. I would have said something got corrupt in the OS that sets up the display, but your reinstall of the system should have cleared that up.

A stretch would be a jumper that sets screen orientation came off.....

adamburgess · Posted: Mon Sep 19, 2022 3:01 pm Post subject:

If you search for the data sheet for the screen (UMSH-8240MD-8T), there is a reset pin that you or a tech could try.

The problem is happening BEFORE the Korg software gets a chance to load, so a Kronos re-install won't do anything. Maybe hook up a monitor and see if any BIOS stuff appears on the PC side initally?

It does involve opening the keyboard up and having a dig around, so be careful!
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BlackForest · Posted: Mon Sep 19, 2022 8:14 pm Post subject:

Ok, so maybe here's a clue in the specs manual of the screen

https://www.google.com/url?sa=t&source=web&cd=&ved=2ahUKEwidgtaz0qH6AhVMLewKHUSFAhwQFnoECAwQAQ&url=https%3A%2F%2Fsimplespec.microtipsusa.com%2Fuploads%2Fspec%2FdatasheetFile%2F1631%2FUMSH-8240MD-8T_V1_R10_20171106P1.pdf&usg=AOvVaw1BnU71vq7k3_U1qrrCJame

On page 9 it shows in a table various orientations which are (I assume) switched by the corresponding voltages. Am not an electrician but I suppose it may be a loose ground connection?

On the other hand, you said you broke your screen to altogether? Is it the touch screen on top that broke, or the here discussed LCD panel?

https://drive.google.com/file/d/1E5OZSsCjOAu_-V1cxzlA0ME16XKUbmMW/view?usp=drivesdk
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Korg DS-8, Roland D-10, M1Rex, Wavestation, Korg SP-280, JV2080, Wavestate, Kronos LS - all RIP

timg11 · Senior Member Joined: 04 Jun 2008 Posts: 459

If your display is indeed the UMSH-8240MD-8T, the datasheet shows a pair of pins for L/R and U/D. Those are pin numbers 39 and 40 on the ribbon cable that connects to the KLM-3007 LCD I/F board (that's the name in the K1 and K2, it may be different in the LS).

According to the Scanning Mode chart on Page 9, both of these pins would have to change state to cause this flip in two axes. I don't know about the LS, but if the normal operation was Down to Up, Left to Right (with both pins pulled high with a resistor, and that resistor failed, it could cause both pins to go low, causing the Up To Down / Right to Left display that you have.

That failure would be on the LCD I/F board, not the LCD display itself. Replacing the display would not fix it.

IMO, the chance of a pull-up resistor failing is extremely low, but not impossible.
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average_male · Senior Member Joined: 07 Feb 2011 Posts: 278

If I'm not mistaken, according to my novice eye and looking at the Korg service manaul (V2), the KLM-3007 specs labeling seems to be flipped. That is, pin 1 of the Korg spec (noted as CN22A) seems to be pin 50 on the LCD datasheet that timg11 referenced. Furthermore, the first top three pins noted in the image below on CN22A are all connected to ground/NC and according to the data sheet for the LCD, these are pins 48, 49 and 50 (ground/NC). What's more Korg notes pins CN22A-1, CN22A-2 and CN22A-3 as being ground/NC and this is consistent with the image below.

If this is the case, then the pins on the KLM-3007 you need to check are the following pins:

pin CN22A-11 (OMAP3.3V) - Should measure 3.3 volts
pin CN22A-12 (GROUND) - Should be connected to ground

The data sheet states for the above pin readings, it should be "Down to Top" and "Right to Left"

Here are the pins to test, I would confirm there is 3.3 volts on that R2 resister, and you are getting ground on the via noted on the bottom blue arrow (but to be super sure, you should take the reading from where the red lines indicate to ensure you are getting the expected values on the actual pins of the connector):

Am I reading it wrong?