Thin vertical blue line on left side of display

beachgig · Post by **beachgig** » Fri Apr 28, 2023 10:32 pm

I connected my 61 Kronos to my 88 Kronos with a usb cable, to see if I could midi them together that way. When I did that, a thin vertical blue line on the left side of my 88 display appeared. I connected the usb b side into my 88, and the usb a side into my 61. Everything worked fine but now I have this line on the display of my 88. I unplugged the cable, turned off the 88, waited 10 seconds and turned it on again and the line is still there. I wonder if I've ruined the lcd display.

The reason I tried this is because I might buy a Yamaha P125 or similar keyboard that only comes with midi through usb, to act as my bottom
keyboard with the Kronos 61 on top.
Any thoughts on what could have caused this? Solutions?

Thanks

KK · Post by KK » Fri Apr 28, 2023 10:42 pm

A link with a picture of your LCD screen showing what you mention would help us try to find out.

beachgig · Post by **beachgig** » Sat Apr 29, 2023 12:23 am

Sorry. Can't figure out how to upload a picture or a link to the pic, but as soon as the Kronos logo comes on after I turn on the switch, the line appears. It's about 1/4" from the left edge of the screen, and it runs from the top of the screen to the bottom. A thin blue line.

average_male · Post by **average_male** » Sat Apr 29, 2023 1:34 am

Connecting a USB cable shouldn't result in this, any chance you rested your hand/palm on the LCD screen with too much force when getting to the back of the board to plug in the USB cable?

beachgig · Post by **beachgig** » Sat Apr 29, 2023 4:55 am

I don’t think I rested my hand on the LCD screen, but maybe I did, and maybe you’re right, plugging in the usb cable shouldn’t cause this.
Thanks for your opinion.

kronoSphere · Post by **kronoSphere** » Sat Apr 29, 2023 2:35 pm

It's often due to a little electric shock.
I have had this with my old Fantom G8

Xenophile · Post by **Xenophile** » Mon May 01, 2023 1:54 am

It sounds like a problem with the display hardware. Most likely a coincidence, and not related to the USB connection. Assuming the problem remains after disconnecting USB and cycling power.

The display itself, the display driver chip or the connection between them is the likely cause. Too much pressure on the display could break a tiny wire and cause this effect.

pete.m · Post by **pete.m** » Mon May 01, 2023 2:54 pm

I had exactly the same thing happen a couple of years ago. There was no reason for it - it just appeared one day. My guess was that it was just a case of the failure of one of the many thousands of components of the display, something not entirely unexpected after 10 years of daily use. It certainly hasn't affected performance, and can only be seen in certain modes - it's pretty much invisible in Seq Mode, for example.

I can try to post a photo of mine if it would help other posters.

beachgig · Post by **beachgig** » Mon May 01, 2023 11:16 pm

Thanks everyone. I'll just have to live with it. It certainly doesn't affect the performance in any way, just maybe re-sale value, if I decide to sell it. If it
wasn't so heavy, I'd never consider that, but gigging with it is getting harder as I get older. I turned 94 yesterday. lol (just kiddin')

average_male · Post by **average_male** » Wed May 03, 2023 3:25 pm

If you ever find yourself needing to open the Kronos (SSD upgrade, etc.) may want to make a mental note to try to reseat the LCD cable(s). Bummer that this happened to you.

Xenophile · Post by **Xenophile** » Thu May 04, 2023 7:09 pm

average_male wrote:If you ever find yourself needing to open the Kronos (SSD upgrade, etc.) may want to make a mental note to try to reseat the LCD cable(s). Bummer that this happened to you.

Yeah, but those little ribbon cables are very thin and fragile. If you're not careful you could damage the cable or connector and kill the display and/or touch screen entirely. I would just live with it as long is it isn't causing any functional problem.

beachgig · Post by **beachgig** » Mon May 08, 2023 2:30 am

Thank you everyone.
I think I'll just leave it the way it is.
Safest option.