The only solution will be take your phone to repair shop, as you can not repair it at home.

I agree, you'd better send it to service shop. They know the best.

If your phone is under warranty then take it to the LG service shop. They will repair it for free

Have you tried to reboot your phone?
Take the battery off for a while?

HI everyone. I'm new in the forums.

I came to this forum for try to find a solution to the problem on my phone. The phone is a LG Optimus L90 and it was working fine until 3 days ago.

If I turn on the phone the LG Logo take about 10 seconds or more in change to my carrier logo company T-Mobile. And then nothing else. I can't do a Hard reset. When the hard reset start The Android image disappear after 3 seconds and the phone restart again.

The battery is fine. I charge it yesterday until 90%. The phone let me see how was the charging status. But I can't find any physical buttons combination who help me to clear the cache, if this model allow that.

In my opinion the phone become unusable after a very important update was unsuccessfully downloaded and applied.

I want to know wish physical buttons combinations can let me clear cache or made some adjustments
.
Thanks for the help.