Yamaha TG77 Installation Manual page 11

Yamaha TG77 LCD Replacement Guide
Fig. 10 - Metal Box Covering Removed from the Inverter
Step 4:
Once the metal box is removed, you will find a small inverter circuit board
with two wired connections. Unplug both of these connections and remove
the inverter circuit board, it is held in place by two screws. The inverter
circuit board is no longer needed for the replacement LCD.
The 2-pin connector that was unplugged from the inverter is connected to
the power supply board and labeled CN605. As stated, CN605 needs to be
desoldered from the power supply board.
Remove the power supply circuit board, which is held in place by 6 screws,
the locations are shown in Fig. 11 on page 12. In order to flip the power
supply board over you will need to also detach the black plastic power
switch button; note how it is oriented so you can correctly reinstall it once
finished. Flip the power supply circuit board over, desolder and remove
CN605, the 2-pin wired connector.
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