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Replacement display for an Elka MK76

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Replacement display for an Elka MK76

Postby The Elf » Fri May 07, 2021 3:45 pm

The backlit LCD of my MK76 has died.

Can anyone tell me, in terms an electronics novice can utilise(!), what I need to order, and maybe from where, to replace it? Hopefully I can do the job myself. :idea:

The schematic mentions 'LC DISPLAY L M 016L'.

This? https://www.ebay.co.uk/itm/143055616621?epid=1165670176&hash=item214ec77a6d:g:sWQAAOSwvERcF~ZD

If so, can I be sure it will fit as is?
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Re: Replacement display for an Elka MK76

Postby Hugh Robjohns » Fri May 07, 2021 3:49 pm

Just to be clear, is it the actual LCD (or its driver) that's dead, or the (back) light?
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Re: Replacement display for an Elka MK76

Postby The Elf » Fri May 07, 2021 3:52 pm

Hugh Robjohns wrote:Just to be clear, is it the actual LCD (or its driver) that's dead, or the (back) light?
It's just the backlight - the torch says!
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Re: Replacement display for an Elka MK76

Postby Hugh Robjohns » Fri May 07, 2021 3:53 pm

Try shining a light in from above -- a pencil torch or the light from your smartphone (you may need to experiment with the angle) -- and see if the display is still showing the correct information or if it is blank.
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Re: Replacement display for an Elka MK76

Postby The Elf » Fri May 07, 2021 3:56 pm

Hugh Robjohns wrote:Try shining a light in from above -- a pencil torch or the light from your smartphone (you may need to experiment with the angle) -- and see if the display is still showing the correct information or if it is blank.
Sorry - my edit crossed your response. Yes, a torch says the display is there - it's the backlight that's gone.
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Re: Replacement display for an Elka MK76

Postby fatbenelton » Fri May 07, 2021 4:52 pm

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Re: Replacement display for an Elka MK76

Postby The Elf » Fri May 07, 2021 5:09 pm

fatbenelton wrote:https://instrumentalparts.com/mk-76-mk-76-lcd-display-screen-backlight/
Thanks. It looks cheaper to buy the whole display from those on eBay.

And easier to install - as long as it will fit?
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Re: Replacement display for an Elka MK76

Postby BobTheDog » Fri May 07, 2021 7:47 pm

The Elf wrote:The schematic mentions 'LC DISPLAY L M 016L'.

Do you have a link to the schematic?
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Re: Replacement display for an Elka MK76

Postby The Elf » Fri May 07, 2021 8:05 pm

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Re: Replacement display for an Elka MK76

Postby The Elf » Fri May 07, 2021 8:09 pm

I decided to spring for one of those eBay offerings. It's only a tenner, including postage, so worth a try.
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Re: Replacement display for an Elka MK76

Postby BobTheDog » Sat May 08, 2021 7:53 am

The 16 pins sort of match up (table 2) : https://embeddedcenter.wordpress.com/ec ... x2-lm016l/

I'm a bit confused that is says that of the extra two connections (15/16) one isn't connected to anything but both are on the schematic so the numbering may be even more wonky, especially as one looks like it would be the contrast adjustment which should be pin 12!

I bet if you plug it in it will work though.
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Re: Replacement display for an Elka MK76

Postby The Elf » Wed May 12, 2021 3:46 pm

Well...

First came the nightmare of trying to figure out how to open the case - half an hour of utter frustration and bafflement followed by one moment of disbelieving realisation. Little did I know...

The true horror of the situation soon began to unfold. The existing display was soldered in - wire by wire. Only two colours were used for the wiring, rather than the friendly rainbow of delight adorning the replacement. No one-for-one wiring match-up then. The replacement display seemed to be giving me a 'knowing' grin.

After a bit of indecision and head-scratching I decided it would be better to simply swap over the backlight. It should be easy enough - remove the tin display cover, unsolder two connectors, pull out the fluorescent strip and replace with the new one.

I removed the display cover and saw the light strip underneath. The display portion itself fell away from the circuit board, leaving no trace, or clue, as to how it been attached. I could see no connections for it - it simply sat on two 'silicon'(?) strips. How the heck does *that* work? No metal connections; no pins, no obvious point of attachment?! Moving the panel and its 'silicon' mounting strips around over the circuit board produced a few lines on the LCD - but no clue as to where was the right position. Heck, I didn't even know if I'd got the strips in the right place, let alone the panel. OK, I'd figure that out later...

I removed the cover of the replacement display (which also fell apart)... to find it had no backlight strip. If my car wasn't parked under the window there would be a dent in the driveway tarmac right now.

Life is too short. Another piece of landfill, a few day's of regret and it will all be over. At least I now have a space to fill with a new toy - pity it won't have poly aftertouch though - and certainly not 76 keys of poly aftertouch, even if it did.

Elf's Elka MK76 - RIP 2021. :cry: I'm going to miss you, girl...
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Re: Replacement display for an Elka MK76

Postby Hugh Robjohns » Wed May 12, 2021 3:55 pm

FFS.... tame experienced tech, proper parts. Job done. Please don't skip a perfectly serviceable and mendable bit of kit.
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Re: Replacement display for an Elka MK76

Postby The Elf » Wed May 12, 2021 3:56 pm

Well it's more than my time is worth. If anyone wants it let me know. Everything I removed is inside the case.
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Re: Replacement display for an Elka MK76

Postby Tomás Mulcahy » Wed May 12, 2021 5:07 pm

But it's a Poly AT board! If I was on the same island I would drive to you to collect it. I'm sure someone will.

Pity you didn't wait a little bit longer, posted pics of the innards etc. we could've helped :( I've done a few displays so I could help. My Akai MX-1000 has an iPhone 6+ backlight in it (common thing people are doing with Akais of that era) the Casio FZ-1 has something similar, and I'm just doing a Quadraverb now.

Replicating the wiring is easy- use a smartphone and make a video as you remove it. Displays with backlights come in two kinds- displays where the backlight is glued/ manufactured in (so it breaks as you discovered) and displays where they are not :D
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