Unfortunately, LG's model/serial number coding changes slightly every year so unless someone has figured out the codes for 2013 for LG, some of the previous codes may have changed. For instance for 2012, "Z" Tv's became LG panels while in previous years, "Z" was used for Sharp. It's a good bet that these will all be LG produced panels as they are passive 3D. As of the end of 2012, 96% of all passive 3D panels produced globally were LG produced IPS panels (LG Display currently supplies Toshiba, Sony, and Panasonic with passive 3D panels). A vast majority of the panels that weren't, were produced for the Chinese market only. If the panel is a size that LG Display currently produces, you can guarantee that it will be an IPS panel right now on passive 3D models. If it's a size LG Display doesn't produce, then it is likely an AUO MVA panel produced on contract.
The best way to know for certain what type of panel it is, is to just take a magnifying glass and look closely at the pixels. LG produced IPS panels have a very obvious chevron shape to the pixels. You can also use a good camera and just zoom in and see them.