To my knowledge the Faroudja 250 will not transcode 1080i YPrPb to RGBHV. Also, if you're trying to use 480i component into the Faroudja, there may be a bi-level vs. tri-level sync issue which is keeping you from seeing a picture.
You will need to buy a component to RGB transcoder from Key Digital or Extron. I have the Key Digital KD-CTC working great with a DH30000; at $200, it's a much better deal than Extron. However, the Key Digital unit does not remove the 'sync on green' that's embedded in the YPrPb signal. So what you get is RGBHV WITH sync on green. Most projectors will just pick a sync or let you select one type of sync over the other, but other projectors do not like sync on green together with H and V sync and will give you a washed out picture or no picture at all.
I drink your milkshake! I drink it up!