Blue LCD Replacement

Yamaha SY77 is a 16 voice multitimbral music workstation first produced by Yamaha Corporation in 1989. The SY77 is a synthesizer whose architecture combines AFM (Advanced Frequency Modulation) synthesis, AWM2 (Advanced Wave Memory 2) for ROM-borne sample-based synthesis, and the combination of these two methods christened Realtime Convolution and Modulation Synthesis (RCM).

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Ricoche
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Blue LCD Replacement

Unread post by Ricoche » Mon Oct 04, 2010 12:06 am

Hello everyone,

Well, I think I'm going to take the plunge and try to swap out my current working LCD for the new Blue LCD for two reasons.

1. That LCD humming noise is driving me insane. I can't turn up my headphones, mixer, or any volume past the halfway mark before that LCD whine kicks in and interferes with the sound. I thought it was my headphones or computer at first since I play near other devices, but I then realized it was the LCD. I wouldn't mind it, but the LCD noise leaks into the outputs and that's really bad for the mix, so unless a "noise suppressor" of some kind can cancel it out, I'll have to put in the Blue LCD.

NOTE: I understand that the current LCD is connect to a "voltage inverter" that is causing the noise. I've read this can or will be disconnected with the installation of the Blue LCD. Is this true? I need to eradicate that LCD whine quickly!!

2. Obviously the LCD is impossible to read in the dark. I often perform and/or practice in dark places. I currently use a little makeshift light, but this is cumbersome. I figure the Blue LCD will allow me to see what I'm doing in darkness and that would be fantastic.

I am handy with a soldering iron and have done several repairs on other synths, mainly the Roland Juno 106.

The parts I need I understand are as follows:

Blue LCD Replacement
http://www.zinguy.com/lcdpage.htm

I'm also thinking of "desoldering" parts off the old LCD for the new Blue LCD replacement. Being out here in Nagano Japan I'm not sure I'm going to be able to find the other parts. Providing I can "desolder" the existing parts, is this all I need?

I may just get parts so that I don't damage the original LCD though. I think I need the following, but am not sure if that's it.

20 way dual row right angle header

http://uk.rs-online.com/web/search/sear ... &R=3606544

IDC Cable
http://search.digikey.com/scripts/DkSea ... ND&x=0&y=0

I'm not sure if the IDC Cable has the plastic connectors on it though or if it's just the ribbon cable.

Along with the Blue LCD part, I suppose that's all I need.

Thanks for any tips.

Jim
Yamaha Gear: Motif XF7, Motif ES8, DX7IIFD, EX5s, CS6r, SY77, SY85, TX816, AN1x, RM50, RX5
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Derek
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Re: Blue LCD Replacement

Unread post by Derek » Mon Oct 04, 2010 7:49 am

Hi,

Yes with the "Cool Blue" display there is no need for the voltage inverter. I have a whine free SY77. :)

The Blue LCD is very visible in the dark, so if you had trouble reading it then the problem would be elsewhere. ;)

You should be able to desolder the connector off of the current display, I didn't as when I repaired my failed display I also repaired the current one with a backlight foil replacement as a spare (although of course that option wouldn't remove your inverter whine).

The IDC cable is probably just the cable with no connectors.
Regards
Derek Cook

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Re: Blue LCD Replacement

Unread post by Ricoche » Mon Oct 04, 2010 11:01 am

Hello Derek!

Thanks very much for the reply. Your info was very helpful.

Today I tried something different and for the interim I think it works really well. I'm a guitar player also and I tried sticking a spare BOSS NS-2 Nose Suppressor right before the Yamaha SY77 and it completely wiped out the humming noise. The threshold is about halfway and the decay is near max, but the sound quality is almost the same as far as my ear is concerned. I set the NS-2 right on the front panel above the floppy disk drive and it's great for tweaking the decay based on what sound I'm playing. Setting it to max will take care of any sound, but it can be turned down if desired with some sounds.

My volume is at roughly 60-70% but I can also crank it up if I desire with no whine what so ever. There can be a tiny bit of residue at the tail end of the sound depending on your decay settings , but in the band or mix I don't notice it at all. In a quiet room if I take off the headphones I can hear the whine a little bit, but frankly it's ok for now and most of the time I forget about it. In a live situation the whine is probably not critical, but for recording or even just general patch work in a quiet room, the whine can potentially drive one nuts.

I'm still going to get the Blue LCD, but in case anybody is still dealing with the whine problem, just stick a Boss NS-2 ( or any noise suppressor probably ) and it should quiet things down considerably or like in my case completely. Loss of tone is minimal and like I mentioned I really don't notice any degradation in sound quality Even when I play with the decay, I still get ample quality sound coming out of the SY77. In fact, I feel as if for some reason it slightly makes it sound more fat or analog....I know I'm pushing it on that statement, but honestly to me it does seem to clean things up and make it sound nice or dare I say better. :wink:

Thanks again!

Jim
Yamaha Gear: Motif XF7, Motif ES8, DX7IIFD, EX5s, CS6r, SY77, SY85, TX816, AN1x, RM50, RX5
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