I have a Main Board for an LG 37LH3000 or 42LH3000, with a part number of EAX60686902(2) for sale. Please note that it is marked as being compatible with LG's own panels, and not AUO panels that were also fitted to the range.
I purchased this board recently whilst attempting to repair my 37" (see thread in spares to buy), however it quickly became apparent that it wasn't compatible with my AUO panel as it would not produce a picture.
To the best of my knowledge, it is fully working, however I have no way of testing this fully to be 100% sure; It is marked as having come from a 42" set, however was sold to me as suitable for a 37" so I presume that it is compatible with both.
If you are in need of one of these, please PM me or post here.
Thanks :)