Yamaha TG77 Installation Manual page 19

Yamaha TG77 LCD Replacement Guide
Fig. 22 – Blue replacement LCD installed in the TG77
Step 8:
Finishing up the installation.
Now that the new LCD is installed, before screwing the case back
together it would be a good idea to test that your installation of the
LCD is working. Adjust the LCD contrast knob on the back of the TG77
as needed. Once you have verified your LCD installation works, screw
everything back together and you are finished.
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