Game Boy Pocket Yellow + Game Cartridge Set

The Game Boy unit powers on and makes sound, but the LCD screen is very faint and almost invisible.
From memory, I believe the screen may have detached once and was reattached with glue, leaving a white residue.

The Yoshi's Panepon and Pokémon Red cartridges appear to function, but the Tamagotchi cartridge does not seem to be working.

Due to the overall poor condition, please consider this a junk item.