Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, have you tried removing the batteries for an extended period of time? ...and while still with no batteries, press any/all buttons? The idea is to help dissipate residual power.
And does the description of "...lcd suddenly stopped working..." mean that the screen is completely black or white or pixelated.
Can we try that please? ...for an extended period of time?
...for an extended period of time; thanks.
This is the only easy user doable try as all others would be with the internal electronics.
I'm afraid yes.
It could be as simple as a loose flex cable cable, backlighting or even re-alignment of the screen, any attempt to open it up even for a look-n-see / DIY (do-it-yourself) repair would void the warranty.
Claiming warranty replacement would be more to your advantage considering that the camera exhibits faults at this early stage of its use.
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; sorry for having to be the bearer of bad news.