Sometimes less than ten dollars
worth of up rated capacitors in the power supply board can fix that it may be a simple fix if that is all that is wrong
unfortunately repair shops tend to want to swap in a new board that is much more costly OTOH that may be necessary ..
If you know a technician or a computer tech we could provide links to information the repair can usually be done in one hour
At a TV shop expect to pay $2-$300.00 an diagnostic estimate is usually ~$50.00 and can be applied to the repairs.
I wouldn't put 2-3 hundred in 2 YR old Apex TV they are a third tier discount brand get us a model # we can see if a power board is available from shopjimmy.com cheap only need a screwdriver or two to change it or maybe JR college that teaches TV repair can fix it for nominal cost.
There are many You Tube videos regarding repairing LCD TV
that covers identifying replacing bad power supply capacitors
in LCD TV It is a common problem and can and does happen sometimes to ANY TV and not usually hard to repair
If you decide to have somebody repair the set (a friend or friend or hobbyist
that does some electrical work and
is somewhat familiar with soldering PC board parts this is a good read post # 2
alternately just replacing a board only requires a screwdriver to remove the back
maybe and basic assembly Basic Diagnostic videos are linked also
just changing a board is fairly simple .