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About the display Dim display Replacing components LED lighting system Dark display |
Annoying whine Lint/dust in display Slow operation (cold) Technical Details LCD module pin assignments |
Functional Description
Also called the LCD (Liquid Crystal Display). Think of the display
as a group of cells, or boxes. These cells are arranged as 8 rows and 8
columns. You select a cell by using the UP or DOWN buttons to choose a
row (or line), then push a letter button to choose a column.
The number of cells on a line is limited to eight, but cells are often joined together to control a single thing. For example, when selecting an effect, the name of the effect spans the four left-most cells. That means buttons A, B, C, and D all select the same thing.
All 01/Ws and the 01R/W use the same 240 x 64 dot display.
Internal DescriptionThere are two typical reasons the display appears dim:
1. Adjust the viewing angle using the LCD
Contrast setting.
2. The display (more specifically and more likely, the backlight) is getting old.
It appears to be far more likely that the problem is with the backlight, not the display itself. You can test this by shining a light on the display. If you can read anything, the display is probably good and just the backlight needs to be replaced. If the display is dim, then the problem is probably just the backlight.
Replacing the entire display module (display and backlight) is more costly and is the approach repair shops may want to take.
To replace just the backlight, you have two choices: Replace the backlight with the same or similar part, or install a new kind of backlight.
Same-Part Replacement from Korg
The service manual specifies a part number of "DMF5005NS-EW1" and an internal Part Code of 313002500. The manufacturer of this display was Optrex Corp.
A Korg repair guy wrote: "the same backlights are used in different Keyboards like Roland W-30, Yamaha SY-77, Kurzweil K2000, Korg i3, T2, T3." [98Jun01Roy] If you can find a scrap keyboard like those listed, you might be able to use that display and/or its backlight in your 01. Check the numbers on the scrap display to make sure it's the same as what was in your 01.
2002Apr12, UK. User reports "Korg UK cannot supply the back light only, as it is not made any more. However you can get the package (backlight & display) for £140:00 plus postage." [02Apr12mt]
2001Nov29: A user reports Korg has discontinued the part number for the module, which was selling at that time for $225 + $6 shipping. Korg said they were in the process of making a new replacement unit, but no time-frame was set. It may be worth a phone call.
2001Apr22, UK: A user reports Korg U.K. wants £150.00 to fix the display. [01Apr22ri]2001Mar15, UK: User reported that Korg will sell you a backlight: "The
cost is £141.60. The parts are in stock and can be ordered by fax on 01908
857199, or by post from:
Korg UK, 9 Newmarket Court, Kingston, Milton Keynes, MK10 0AU. E-mail: gareth@korg.co.uk.
1999Jul12: The cost to have Korg replace the LCD module was reported to be $350 in 1999. A "fix-it" shop in Florida quoted a user $335.
1998: From Korg, the LCD section was selling for about $200, the backlight for about $50 ($US). A Korg repair station reported in 1998 that Korg has stopped supplying the backlight except as part of the LCD module.
I first saw e-mails discussing this company on 01Jan14 so they have been around at least that long. I have no personal experience with this company. You can ship the your entire 01 to them for repairs. If you can remove the display youself and ship just that. For details on repairs and current prices visit their backlight web page.
Synthrestore06Nov: One UK 01er recommended http://www.synthrestore.co.uk/. They were selling backlights for 35 pounds when I checked the site on 2006Dec15.
Unknown Source of Display (not Telesis) and labor
2002Mar22: "I paid $250.00 for my back lite plus labor....$80.00." This user did not say
who did the work. I include this to show how much one person paid.
Synthrestore
06Nov: One 01er in Morocco had a backlight shipped from
http://synthrestore.co.uk/products.htm#screens and
was happy with the results (a blueish backlight).
Telesigear
06Nov: Backlights are available from http://www.telesisgear.com/. Video instructions are
offered from the same source but are reported to mention the 01 briefly in a
Word document with a photos of just the removed display. The new backlight is
said to be installed over the old, which need not be removed.
Synthlights
09Jul23: Backlights are available from http://www.synthlights.com/.
Listed here for the first time on 2009Jul23, I've had no feedback pro or con on their products or service.
They say their backlight is shown in a photo at a Korg Forums page.
Digi-Key
02Mar24: A user reports that new display modules (LCD and backlight)
may be available from a mail-order electronic parts distributor called
Digi-Key.
1999: One reported source of LCDs is Northern Music and Video in Potsdam, New York, (315) 265-8100. (99Nov)
Alternate backlight approaches
AND 4021ST-EO
User Ed Edwards replaced his own display. He bought the
module (manufacturer: AND, model: 4021ST-EO) for US$49.00 from Timeline.
(Ed later warned 01ers to avoid this company saying he received used parts
that were not advertised as used. His module lasted just four months and the
company did not reply to his queries. Ed's notes on using the AND module,
however, can still be useful.)
Regarding the AND display: "It is the same
circuitry, and the identical physical size. You won't need to make any sort of
adapters, you'll just have to pull off a male connector from the board and
replace it with the bare end of your ribbon cable. Likewise, you'll have to
remove the power supply leads from the old one and solder them to the new. [01May09ee]
... "It comes with a connector on it which you will have to remove by de-soldering. Then you'll have to de-solder the ribbon connector from the old board and solder it to the new one." [01Apr22ee]
Regarding that experience he wrote: "You have to take almost every single screw out of the thing to do this, and it's not fun. And the module has an ugly connector on it that must be removed. And you must de-solder the end of the ribbon cable from the old module... etc." [01Apr21ee]
Backlight
A user submitted the following information:
MIDI-Rakete (small company located in Germany) sells EL-type backlights
for various instruments.
Foil Type 4: Korg 01 W EUR 29,00
Postage Europe: EUR 5
Postage International: EUR 10
Link: http://www.midi-rakete.de/
{2003 July 03}
Given the expense and scarcity of backlights, resourceful starving artists have devised a different way to provide back-lighting. It takes time and someone handy with electronics.
The LCD needs light behind it in order to be visible. The original backlight was a rectangular high-voltage electrolumescent (EL) panel. One user reports he was able to install yellow LEDs around the edge of the LCD, which emitted enough light to do the job. You can use any LEDs of color, it's just a matter of how bright you want it. LEDs require a much lower voltage than an EL panel, but draws a bit more current. Current shouldn't be a problem if you wire the LEDs to the 5-volt supply.
However, one user casts doubt on installing LEDs, writing: "There was
a post by someone a while back who said he had LEDs installed along the
edge of the display. I find this hard to believe
because the display is surrounded by a metal frame that is opaque.
To make this idea work, some VERY dangerous operations have to be done
to that big LCD matrix." [01Apr21ee]
Fortunately (for me), I haven't had to go through this repair, so I can't tell you any details about mounting the LEDs or where exactly to pick up power. But a friend with a moderate electronics background should be able to help you out (5 volts can be easy to find).
There are other, less available, possibilities that may work, like woven fiber-optic panels.Getting at the Display
If you want to work on the display, you must disassemble your 01. Different
models seem to be more or less difficult to get into, but assume it will
be a chore. Patience and organization are required. For tips, see the Disassembly
Page of this site.
How to reverse the polarity (thanks to Mike Werning, who wrote:)
"You don't have to disconnect any circuit boards, just remove the bottom
panel on the 01 to get to the insides. The connector is located right next
to the main board on the power supply board. It is a 4-pin connector with
only the two outside pins populated. I believe its designator is CN16 (01W/fd)
on the power supply board. Since the connector is keyed, you cannot simply
unplug the connector rotate it 180 degrees and re-plug it in. You must
disconnect the connector, pull out the pin receptacles on the connector
and swap the positions. It's simple to do. Just use a jewelers screwdriver
to depress the lock tabs on each pin to release them. Once you have swapped
the pins and reinserted them into the connector housing, plug it back in
to the main board. That's it."
To get at the LCD for these procedures you will have to dis-assemble your 01. For instructions on dis-assembly and re-assembly, click here. Note: to remove the display you must remove the CPU card and keyboard. Those who have done it say it's not that complicated, but it is tedious and requires time and organization.
Officially, the only to get at this lint is to take apart the entire 01, working from the bottom to the top. This is a huge job.
Unofficially, 01 owners report that the bezel is held in place with 2-sided tape. You can remove the bezel from the outside by using a pointed object/tool (like a pin or craft/Xacto knife point) to penetrate the side (edge) of the bezel and lift it out. I assume they mean the along the top of the bezel (towards the back of the 01) where it protrudes a bit more above the metal chassis.
If you decide to try this, I suggest caution and patience (unless your 01 is so road-worn you don't mind additional scratches). In theory, this looks valid, so I guess it's worth a try. Although some 01 users re-used the old tape, you might want to look for some fresh 2-sided tape to replace the old as long as you have it open.
Slow Operation
It is normal for the display to operate more slowly the colder it is.
Mine gets visibly slow when the temperature drops below 60 degrees F. This
doesn't harm the display.
The manual doesn't specify any operating or shipping temperatures. However, the LCD Module shows the storage temperature range shoule be between -20 and +60 C (-4 and 140 F). This is important! If you store or transport your 01 where the temperature getss outside this range the display may be damaged!
Users in northern Europe have reported shipping their 01s in the holds of commercial planes (extreme cold) with no damage.
It's a good idea to let your 01 warm up to room temperature before turning it on, just to keep from stressing things too much.LCD Module Pin Assignments
(connector CN9A)
| Description | Name | Pin | Pin | Name | Description |
|---|---|---|---|---|---|
| Ground (signal ground) | VSS
gnd |
2 | 1 | FG
gnd |
Frame Ground (connected to metal holder) |
| Power supply (LCD)
"CONT" is an analog signal originating from IC55 digital-to-analog port pin 67 through op amp IC54 buffer circuit, exiting through R147 (100 ohm) to the display. |
VEE
CONT |
4 | 3 | Vcc
(5v) |
Power supply (logic, LCD drive) |
| Read data | RD-
IORD |
6 | 5 | WR-
IOWR |
Write data |
| Command (high)/Data (low) | C/D- A1 |
8 | 7 | CE- LCD |
Chip Enable |
| Reset controller | Reset- RESET |
10 | 9 | nc | no connection |
| D1 | 12 | 11 | D0 | Data bit 0 (LSB) | |
| D3 | 14 | 13 | D2 | ||
| D5 | 16 | 15 | D4 | ||
| Data bit 7 (MSB) | D7 | 18 | 17 | D6 | |
| no connection | nc | 20 | 19 | FS Vcc |
Font Size (H=Vcc=6x8 dots, L=8x8) |
LCD Module 01 signal names and functions are shown on the top of the cell
01 connections are shown under the LCD signal name and description when different.
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