Hi, Andriy! I would recommend you to turn to a specialist for an advice and he could also fix the problem if it's needed. Where are you located? I can advise you to look at HireRush.com website, there is a list of different professionals, included those who provide hoverboard repairs.
In this category you can find pros who may help you with it: https://www.hirerush.com/anywhere/service/moto-bike-services
For example, here's an Ad of one of them: https://www.hirerush.com/service/2-wheel-smart-balance-electric-scooter-hoverboard-repair--parts_i25976
Hope it will help.