You would either google how to get it out of hotel mode, ask in forums (my answer would be the result of a google search which you can do) or try AVS Forum since I've seen more folk have that detail there.
LG LCD TV 37LG710H has many restrictions. Cannot change inputs, reads feature is restricted. The settings menu is limited, there is no option to restore to factory factory. Was informed this may be in hotel mode but none of the passwords that I got online to get past the restrictions do not work in.. 0000, 7777 etc.