Properties

• A small and nice prepared pcb to easily fit into the Game Boys housing
• 6 coloured cables for simple soldering
• L x W x H: 19.3 x 9 x 3mm (without the cables)
• Weight: ~1g
• The unused inputs of this so called bivert-pcb or hex-inverter are set to high signal to prevent them from floating free
• A small capacitor between + and - keeps the chip stable

Application

• For a signal inversion of the Game Boys LCD
• Together with a polarisation foil (rotated to inversion) its a double inversion = biversion
• This biversion gives off a far better contrast of the LCD together with a LED backlight

Additional notes

Actually there is a german tutorial for this pcbs installation, only:
Bivert-Mod für Game Boy DMG und Game Boy Pocket

BUT with this nice picture from that tutorial you don`t necessarily need any further explanations. The colours of the pcbs cables match the 6 solder spots in the picture:

A service for all those installations for the Game Boy and other consoles offers
Andreas König from Germany: DonKing Konsolenservice