problem with Korg AX1500G LED display

jcarndt · Post by **jcarndt** » Mon May 07, 2012 12:04 am

Hello all,

I recently bought a used AX1500G on ebay, and after I plugged it in I noticed that the LED display that shows patch name, values, etc, seems to be very weak and hard to read. Is this normal ?
Has anyone here experienced this, and if so is there a solution for this ?

rockingronny · Post by **rockingronny** » Wed Jun 13, 2012 1:09 pm

Hi-I have the same problem with my AX1500g I purchased a new display from Korg and fitted it, but it did not make any difference! It is a shame because it makes it very difficult to use. If there is some kind of adjustment please advise.

mikanb · Post by **mikanb** » Fri Aug 15, 2014 9:42 pm

You have to replace two red LED's located on the left and right side of the display (soldered on the PCB). That will solve your problem completely, there is no need to replace the display.

Mirko Bjelica.

stevealfa · Post by **stevealfa** » Sat May 02, 2015 9:56 am

Hi I have same problem - I looked at PCB but there are no LEDs either side of the dsplay - any other suggestions?

mikanb · Post by **mikanb** » Thu Mar 24, 2016 9:25 am

Yes there are LED's, otherwise you'll have no visibility on the display. I replaced original red smd LED's with the ordinary cold white ones (type 5050) and got even better effect and a lot better visibility when used in a bright environment. Take a look at the pictures of my AX1500G as a reference...

[/img]

UnemployedExpert · Post by **UnemployedExpert** » Sat Aug 06, 2016 8:45 pm

mikanb wrote:Yes there are LED's, otherwise you'll have no visibility on the display. I replaced original red smd LED's with the ordinary cold white ones (type 5050) and got even better effect and a lot better visibility when used in a bright environment. Take a look at the pictures of my AX1500G as a reference...
[/img]

Very nicely done!

I have the same problem, and I'm looking for replacement LED's on digikey. Can you tell me which ones you used? I'm overwhelmed at the billion LED's on digikey.

mikanb · Post by **mikanb** » Sun Aug 07, 2016 6:08 am

I used a type 5050 (see the picture below, the one in the middle) since those could fit under the display and had perfect brightness for this purpose.

Just let those guys at digikey know that you want a LED type 5050 with the color "cold white" and they will know what to provide.
I hope this helps.

UnemployedExpert · Post by **UnemployedExpert** » Sun Aug 07, 2016 4:48 pm

mikanb wrote:I used a type 5050 (see the picture below, the one in the middle) since those could fit under the display and had perfect brightness for this purpose.

Just let those guys at digikey know that you want a LED type 5050 with the color "cold white" and they will know what to provide.
I hope this helps.

Okay thanks. I was trying to find an exact replacement, but I can see how this gets the job done too.

A curious question I have though.. why were the original LED's failing?? Seems like LED failure really isn't common!

mikanb · Post by **mikanb** » Thu Aug 11, 2016 5:47 am

Yes, you are right, LED's should work much more longer than those originally installed on AX1500, Engineers from Korg should check this out for future devices, maybe the resistor which regulates electrical current through the LED is too small and it burns LED sooner that it should.
You will see that also other red LED's on the processor, the ones above the pedals, above the potentiometers and below the rotary switches, will start to glow differently over the time. I asume that, it is a factory bug. Maybe the LED's were some low cost. Who knows.

mikanb · Post by **mikanb** » Mon Dec 17, 2018 8:29 am

Few forum members reported that they can not see the picture of the display I posted few years ago, most probably due to a broken link from the image hosting server so here it is attached again...

VinceInMT · Post by **VinceInMT** » Mon Jul 29, 2024 1:57 am

I know this is an old thread but does anyone have the name and model number of the LEDs to replace in order to solve this problem?

voip · Post by **voip** » Mon Jul 29, 2024 8:21 am

Unable to find the part number details for the AX1500G.

If it's the 7-segment numeric display that is the issue, then this link might be helpful. There's a selector section that can be used to narrow down the choices, based on character size, module size, colour, and the like:

https://www.mouser.co.uk/c/optoelectron ... %20Segment

On the AX1000G, which has a very similar looking display section to the AX1500G, the 7-segment LED part number is NAR141S-B, which is a common anode device, so it's worth looking for the equivalent display part.

If it's the LCD backlight, then the AX1000G uses two LEDs type FY1101F or 12-21UYC/S400/TRB. Just measure the backlight LED outline on the AX1500G and the LED connection spacings, and the light throw pattern/lens, and compare the ratings and order LEDs to suit.

.

VinceInMT · Post by **VinceInMT** » Tue Jul 30, 2024 11:35 am

Thanks, that really does help. I pulled one of the LEDs out of my unit and measured the voltage and it was 2.9. I posted a query to digikey and they gave me a list to choose from that match that voltage. Yours show be the lens configuration to look for. Thanks again.

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