Seems to me that LG may have made service menu accessabilty harder in the LM series in an attempt to stop the hackers enabling features that were not meant to be enabled for certain countries.
The logic behind this escapes me but it seems for example, that AC3 pass through and dvr function are enabled by default on all 6500 series tv's sold in australia and new zealand and probably europe as well but not in the USA,why?.
As for the THX function this seems to be disabled on all of them,again,why?
We all know that DTS pass through is disabled in all countries except Korea cos they were too mean to pay the licencing fees.
I also suspect that the mainboard is the same for ALL LW series tv's and only the software makes them different which means,theoretically speaking, you could change a 5600 to 6500 by changes in the service menu which i guess would explain why the lm series is harder to access