Tyndal effect is due to Scattering of light and not due to charge.
Tyndall effect is independent of charge on the colloidal particles. It is an optical property and depends on the size of the colloidal particles.
The Tyndall effect, also known as Tyndall scattering, is light scattering by particles in a colloid or particles in a fine suspension. However, electro-osmosis, coagulation, and electrophoresis depend on the charge on the colloidal particles. These are electrical properties.