Many LG phones get stuck on Logo while opening. I have found an easy tip for people to restore their data.

1) Open your smartphone and find its processor it is a big chip and does not have a lot of capacitors surrounding it.
2) Put thermal paste on its processor and heat it up through your home iron tip then leave it for some time.
3) Put piece of foam on chip not necessary it is to keep thermal paste on chip to keep it cool.

Close your phone and after 1 hour try to restart it. I personally have interest in cell phones and web design although I work for miami web design agency but my passion keeps me pushing to dig into details of website issues and cell phone problems which most people encounter.