i rarely recommend disassembling a unit, especially if you need a service guide.
against better judgement, to get to the cpu....
flip unit over, so looking at bottom, battery closest to you.
remove thermal door (memory slot cover) and hdd door. (2 screws each, but they stay attached to doors)
remove hdd, 1 screw on left hand side. slide to right, lift up. While there remove flat silver screw below hdd and keep those scews with the hdd.
move back to the thermal door, and under it you will need to unplug speakers near top, modem cable, mic cable and both wlan antenna.
Then remove all lower case screws on bottom. forgot how many, but many are visible from bottom. don't forget 1 that was covered by thermal door, and 3 that were covered by hdd door
grab unit where battery was and lift up.
should be 3 screws, remove 1 from each hinge, and 1 near usb ports.
flip unit again so it is in front of you like you are going to use it. open lid.
carefully remove middle cover by grabbing right side near hinge and lifting upward. should snap right out.
2 screws to remove KB, fold KB towards you and release connector. be careful as not to break connector.
also remove TP cable from connector
also remove LCD switch from connector, top right hand corner
then remove LCD cable on top left hand side.
pull WLAN antenna up thru from the bottom.
Remove 3 screws from upper case, near the top of where KB used to be.
stand unit on end, so s-video port is on top.
slowly separate upper and lower case. you may need to gently (GENTLY) pry the upper case as it may hang on the svideo port.
Whole upper case, with LCD should separate from lower case
remove 2 screws securing mainboard. one on right and other towards left center. Screws will be marked by arrows pointing to them.
Place fingers on optical drive and push it away towards the right. should slide right out. if not, you missed a screw on the bottom.
Grab the Battery terminals on the rear of mainboard, and gently (GENTLY) pull unit up and towards you in one motion.
Board, along with DC board attached will come out.
flip board over to look at bottom.
6 screws I believe hold on the thermal module (heatsink + fan). Also make sure you unplug the fan before lifting the thermal module up.
there is the cpu
use a small phillips head to unlock cpu
remove cpu by picking up.
reverse procedure for reassembly.
DISCLAIMER: This was all done from memory, but most steps should be good. Use common sense if you have it to keep track of the screws. If you put screws in wrong place you will damage you case. If you break your unit, don't come crying. If you really need a service guide to disassemble a unit, you don't need to be taking it apart. If you still have a warranty, try that first before you break something yourself. Last but not least.....If you have no experience, and are not fully confident you can do this than DON'T DO IT. You will mess up and you will break it.