I noticed these 5 power IC's that where not fastened to the heat sink like the others beside them were. Is this normal for these to not be connected to the heat sink? There are no holes in the heat sink for these 5 devices.

Two of the IC's/transistors in question were marked 1B22BR & 1B17N.Click image for larger version.  Name: IMG_1119.jpg  Views: 406  Size: 141.4 KB  ID: 6426