This post is to tell the NG about my experience replacing a dead lcd screen on a Korg T2 workstation.
This is a friend's keyboard, which he gave to me hoping that I could resurrect it. In fact it appeared completely dead... no text on the screen,
no red lights on the buttons and, of course, no sound.
This is what the original LCD display was showing at powerup
After having checked that the voltages at the power board were correct, I decided to replace the whole lcd display, in the hope that it could give me additional information on what was wrong.
I've ordered the replacement at
http://www.ebay.it/itm/Blue-LCD-240x64 ... 17373646?
the company is china based, their web is at www.buydisplay.com, I've paid around 30 $. after 1 month it was in my mailbox.
This display differs from the original as it as two additional contacts on the connector. They are for lcd led backlight. I've used the original connector to connect it to the power board but I had to make some modifications.
On the power board I've removed one of the bridge wires going from transformer to the white connector and added a 220 ohm resistor to the 5V line (see pictures)
I've repaired the black plastic button "springs" gluing some plastic shapes
see also the wires going to the connector backlight leds
As per contrast control, since the new display provides -20 Volts at pin 20, I've added a 10K ohm pot on the main board as follows: central sweeper at pin 4, the other two contacts of pot one to ground, the other to pin 20. With this configuration it is connected in parallel to the original pot and I had no need to modify the main board with heavy changes. See pic:
Now, when I power up the keyboard, I got this on the display:
and this:
and since I know nothing about this keyboard, my question is: do I need to reload all the factory sounds ? In that case I need factory disks, I guess!
Is anyone out there willing to help?
Synthjoe! I've read that you might have something useful?
Thanks you all!
Angelo