Sunday, 27 December 2015
Replacing the LCD module on a Yamaha DX11 Synthesizer
I opened up the the synth and measured the size of the thing and then trawled through catalogues looking for similar devices. I found the Displaytech 162B-BC-BC looked to be the right shape and size, and the row of pins was in the same position along the bottom edge. The Displaytech part has 16 pins instead of 14, but I could see from the datasheet that pins 1 and 2 were connected to the backlight. It was readily available from RS Components at £7.94 (Part number 532-6379) so I ordered one.
While I waited for it to arrive I found the Service Manual for the DX11 on line, and that confirmed that, apart from the two extra pins for the LED backlight, the connections were exactly the same on the two displays.
I had to extend the wires on the LED backlight, and my attempts at desoldering the 14-pin header on the old display were unsuccessful, so I cut the wires one by one, and soldered them to the new display module. The wiring between the connector and the module is 1 to 1, but since the wires are not colour-coded (except for pin 1), it is wise to move them one at a time. In the picture below, you can see the LCD module, nestling in the middle, between the larger PCBs. It is held in place by a metal surround which is secured by a single screw.