Thank you Riot. ZERO LP for a ranked win.

Read THIS

I reached Divison 1 of my league, and I am not earning as many League Points as before. Why is this? When you enter a ranked game, you are matched with teammates and opponents based on your matchmaking rating (what used to be called Elo). It is expected that your matchmaking rating is about equal to other players in your League. If for some reason your matchmaking rating is below what is expected in your League, you will see League Point gains come much more slowly as you approach your Division 1 Series. Because League placement is now permanent, we have designed the system to ensure that a player’s matchmaking rating is high enough to ensure that you can consistently play at the level of the next tier. As long as you continue to win more than you lose, your League Point gain will even out and you’ll reach the Promotion Series.

It is possible to earn 0 League Points if your MMR is too low to qualify for the next tier.

what foggypaws said. you still have elo but we cant see it. if that elo isnt high enough to qualify for the next tier, youll have to wait until you get your hidden elo higher.