Instructions
Turn the Wii over and look for a white sticker with a number on it that looks like a UPC code. It is just above the power plug. The serial number starts with the letter L.
Call up the Wii Drive Chip Database.
Look under the "Serial Number" column. Find and click on the serial number's first five digits in the list.
Look in the purple area labeled DVD drive chip in the next screen. This is the chip in the Wii.