Learn Italian: Il telefono è rotto, puoi ripararlo per favore? - The phone is broken, can you repair it please?

Lo means "it" (referring to the masculine noun telefono). Because riparare (to repair) follows the modal verb puoi (you can), it stays in its infinitive dictionary form. In Italian, you can attach object pronouns directly to the end of an infinitive.

Can I put the lo before the verb instead?

Yes! When using a modal verb like potere (can) with an infinitive, you have two choices for where the pronoun goes. You can attach it to the end of the infinitive (puoi ripararlo) or place it before the conjugated modal verb (lo puoi riparare). Both are perfectly correct and mean the exact same thing.

What happened to the final "e" in riparare?

Whenever you attach a pronoun to the end of an infinitive, you drop the final -e of the verb to make the word flow better. So, riparare plus lo becomes ripararlo.

If I was talking about a broken television (la televisione), how would this sentence change?