The problem that the mouse wheel fails or the wheel does not turn is generally an encoder problem, and you can purchase a roller plate to replace it. This is used for G603 mouse.
Used，but it can work in good condition
Specifications:
Compatible with: Logitech G603 Mouse
Color: As pictures show
Material: Plastic
Quantity: 1PC
Package includes: (Without retail package)
1 x G603 Mouse Encoder Wheel Scroll Click Switches Board