seamonkey wrote:I nominate this for STUPIDEST THREAD ever in the history of the internez.
Walter Ego wrote:Thanks for more great info. Can the bootloader USB also be programmed with the HxC firmware via Mac? I can track down a PC but I am typically a Mac user.
salwa wrote:Does anyone replaced LCD in Q-80EX? Mine has rather burned out display.
Rasputin wrote:salwa wrote:Does anyone replaced LCD in Q-80EX? Mine has rather burned out display.
I haven't specifically done this, but I suspect no one else has, so I'm going to take a blind stab at it anyway. If you can take some pictures and measurements of the display board in your Q-80EX then we might be able to confirm some things and narrow down the choices.
Keep in mind that this is just guesswork at this point!
Judging from the Q80 model, I would suspect a workable replacement to be a 16x2 LED LCD at 5V with a HD44780 controller with 14 pins down one side and two separate pins for the backlight. Something like this, maybe:
Of course you'd have to solder a display connector to the header, so it wouldn't be a drop-in replacement. The pinout of the Q80 is a bit odd, and I suspect the Q-80EX is as well, but I do not have one to confirm. Again, pictures and measurements would help.
Kawai Q-80 display pinout:
1 - PD7
2 - PD6
3 - PD5
4 - PD4
5 - PD3
6 - PD2
7 - PD1
8 - PD0
9 - LE (enable)
10 - LWR (write/read)
11 - A0 (address pin = RS, probably)
12 - VEE (contrast)
13 - VCC (+5VDC)
14 - GND (ground)
LA \ both of the backlight pins
LK / are on a separate connector --- LA is anode, LK is cathode
Modern LCD LED display:
1 - VDD (to old pin 13)
2 - GND (to old pin 14)
3 - V0 (to old pin 12)
4 - RS (to old pin 11)
5 - R/W (to old pin 10)
6 - EN (to old pin 9)
7 - D0 (to old pin 8)
8 - D1 (to old pin 7)
9 - D2 (to old pin 6)
10 - D3 (to old pin 5)
11 - D4 (to old pin 4)
12 - D5 (to old pin 3)
13 - D6 (to old pin 2)
14 - D7 (to old pin 1)
Backlight Anode (or pin 15 on displays with pins across the top) - LA (connect to old LA / +5VDC)
Backlight Cathode (or pin 16 on displays with pins across the top) - LK (connect to old LK / ground)
As you can see, it's almost a 180 degree flip EXCEPT the +5V and ground pins have to be twisted, and the old backlight connector is attached separately.
salwa wrote:I dismantled my Q-80EX today, but the display PCB is hold by four screws and six little bended pieces of metal. Unfortunately, the top middle is soldered to the green wire and could not be bend.
I'm not that good in soldering to try to remove the wire, as I'm afraid to mess something seriously up (and I need sequencer to be in working condition - I have live show coming up). So I guess I have to find a technician to do it, which may take some time, I'm afraid. I'm terribly sorry for the fuss I made.
Rasputin wrote:salwa wrote:I dismantled my Q-80EX today, but the display PCB is hold by four screws and six little bended pieces of metal. Unfortunately, the top middle is soldered to the green wire and could not be bend.
I'm not that good in soldering to try to remove the wire, as I'm afraid to mess something seriously up (and I need sequencer to be in working condition - I have live show coming up). So I guess I have to find a technician to do it, which may take some time, I'm afraid. I'm terribly sorry for the fuss I made.
Only those 4 screws come out, if you need to measure or access the screen to clean it, etc. The wires can even stay connected.
You wouldn't actually replace just the LCD itself, by the way. You'd be replacing the entire screen and that green controller board at the same time. So those metal tabs aren't ever undone, you'd just unsolder the wires across the bottom, the two backlight wires, and that green wire from the tab. Then the new board/display would go in and you'd reconnect those wires.
Measurements of the board would still be good, but the picture did answer a couple questions. Looks like this display would be closer and the pins are ordered differently and are in a row across the bottom:
That layout makes it way more straight-forward to flip the connectors.
salwa wrote:Little update - mounting holes on display PCB are 71 x 36 mm.
Rasputin wrote:salwa wrote:Little update - mounting holes on display PCB are 71 x 36 mm.
Now follow that link in my last post in this thread. Toward the bottom are the Specifications. Compare to the size measured of your display.
Hint
Outline Dimension - 84.0(Width) x 44.0(Height) x 13.3(Thickness)
Visual Area - 60.80 x 16.90mm
There's also a link to the datasheet on that page which shows the mounting hole layouts and dimensions of the board in graphic format.
Keep in mind that manufacturing tolerances may be off by a little bit, so it doesn't necessarily have to be spot/bang/dead on (pick your idiom).
salwa wrote:Yes, I'm aware of specifications in that auction. I posted those measurements for, let's say, future generations (this is Archive & Repository thread after all) - maybe they will help someone
Rasputin wrote:Wow! Thumbs up, man! Glad you saw it through and that my guesswork happened to lead to a bulls-eye
I'm sure some research would yield a perfect fit, but we'll consider it a win.
Return to General Synthesizers
Users browsing this forum: rceoiny and 13 guests