I'll try to suggest, but I never did it myself.
After reading a little on the internet. Found instructions for the nearest model LT-32M540. Here's a link. There are two options at once, although it is not particularly detailed where to look for the recovery button on the back. You need to somehow intuitively understand where it is on your model and then follow the instructions.
First, try to power off the device. This means more than just turning off the TV with the remote control or the button on the front panel.
It still does not hurt to remove all connected peripherals from USB ports: they can affect the TV software loading. Do not forget that after such a procedure all initial settings will be reset, including time, date, etc.
If this step does not help, the problem is most likely in the firmware itself. It needs to be updated. If you can do it yourself, download the latest version from the manufacturer's website. If you do not have the opportunity (lack of experience), contact the service center.
Constant "freezing" at the start-up stage is itself an alarming sign. If this is repeated periodically, you should contact a technician repair specialist.
For information on how to properly handle TV receivers on the Android platform, typical problems, read on our website: