iPhone doesn't charge after drop down

Hello everyone!

I dropped down my iPhone 6. The phone had only cracked screen, so I was happy with result because the phone still worked. But! Before I came home, the phone was out of battery, so I plugged it in to the charge but nothing happened after 24 hours in charge. DEAD.

I tried to change battery but still nothing.

When I tried to measure the battery after 24 hours in charge, it had 0V.

I tried to measure input voltage on motherboard and it had only 0.8V and I think that is a problem.

It looks like bad charging dock or something like that. What do you think?

Thank you!