Bob
I just plugged my USB Thumbdrive into the USB port on my LG42LN5700 Smart TV. I can see the files that are photos but not the PDF files. I did this by going to my input list and selecting the appropriate USB number.
How do I see PDF files from on my USB Drive?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic