LCD TV Model LM2010 Master Code / Child lock
To open the TV child lock press 3, 3, 0, and 8 (time interval of 4 to 5 seconds)
On many devices, pressing and holding the POWER or START button for 3-5 seconds will set or release a tamper lock.
And some/many tvs have a universal code that will work, regardless of what code the user set as well. 0000, 1234, 1111, simple things like that...
The buttons on TV are locked (also the soft power button and the menu).
On cracking the code: First try easy numbers like 1234, etc. Then do a straight run from 0000 to 9999. Once you get going, you'll get faster.
Plus - maybe the original person set a simple code like that, there are only 9999 possibilities
You almost certainly need the remote, and also the Bellagio TV service manual that hopefully will tell you how to unlock it, however an instruction manual might tell you as well.
Photo by taleswithgigi.com