I have an LG Dishwasher LDF7932ST and I'm not getting any water out of the top blade.
I removed the blade to see if water would come out of the spout, just to troubleshoot if the blade was clogged or not, and no water came out of the top spout with the blade removed.
I then removed the entire "hose" that takes water from the bottom of the tub to the middle and top arms, turned it upside down, and ran water through it. water DID come out of the normal top, so it is not clogged.
The only thing I can think of is a water pressure issue. Does anyone else have any ideas?
Thanks in advance.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic