Ryobi CSB142LZ - Used a fair amount. Recently used it and made a lot of noise. It seemed like the spindle lock was partially engaged. Now, the spindle lock does nothing, ie, doesn’t prevent the blade from turning. The motor runs, but the blade does not spin. It is like the motor shaft is disconnected. Bought a new saw, but wondered if this is worth fixing.
Replacementparts.com show s no gearbox for this saw so it appears you have a snapped shaft. The armature goes for about $59 and you could get a new saw for that amount so it's not worth fixing. Numerous other parts are no longer available so don't waste your money. Just for fun, take it apart and see what happened. If you're in the USA, you have time on your hands.