There is an upgrade file at the OFA/JP1 group for the Dell W3000 that makes me think it is made by LG Electronics since the basic IR command set is the same.

If so, then these are the typical discrete commands for LG. If you have a Pronto you can create the hex with MakeHex. Search for that term in this forum and you will find links and instructions. OBC=Function and te Protocol is NEC1 device=4.

Obviously, try these at your own risk, because I don't have the gear and this is educated guesswork.

NEC1:4 (OFA Setup code TV/0019)

OBC EFC
196 172 POWER ON
197 176 POWER OFF
197 176 SYSTEM OFF
214 110 ANT/CABLE or TV
152 253 RGB & POWER ON
152 253 RGB 1
213 112 RGB-PC or RGB
198 174 RGB2-DVI or RGB-DVI or PC
215 114 RGB-DTV
090 231 VIDEO & POWER ON
090 231 VIDEO or VIDEO 1
208 109 VIDEO 2 or VIDEO(Exp.)
209 113 VIDEO 3 or FRONT-VIDEO
210 111 VIDEO 4 or FRONT-VIDEO
081 105 S-VIDEO & POWER ON
081 105 S-VIDEO or S-VIDEO 1
216 237 S-VIDEO
211 115 S-VIDEO 2
191 034 COMPONENT & POWER
191 034 COMPONENT or COMPONENT 1
212 108 COMPONENT 2
119 138 16:9 (ASPECT RATIO) or WIDE
118 134 4:3 (ASPECT RATIO)
175 098 ZOOM (ASPECT RATIO)
153 001 AUTO CONFIGURE