What player u using? What is your idle temperature and gaming temperature?

Can u open task manager and check if there is any other process utilizing the cpu?
Depend on what game u playing, intensive game like BF3 will hit over 90c if u're playing with TurboBoost enabled.

Hi Sifus, i wanted to send my notebook dv6 to service center located at HP tower. Do i need to make appointment before go? Btw, usually take how long to repair my lappy or is it collect it on the spot?

My defect is the fan problem which detected when i switch on my lappy and the message will auto pop up during loading...

Any 2.5" enclosure should fit.. no?

Check if your CPU is throttled.

The only thing that still scare me is when u flex out the base cover to make clearance to the connectors on the left side of the mobo. Other than that is still manageable.

I opened the mobo again yesterday for the 3rd times and it only takes under 1 hour to complete. Without looking at the manual at all. 

Basically u need to:
1) remove the components and wires.
2) push the keyboard from bottom and remove it.
3) disconnect the zif connectors on top cover.
4) pry out the top cover.
5) remove the zif connector and power cable from motherboard.
6) remove LCD, fan and bluetooth connector and unscrew the fan.
7) flex the left side of the base cover and pull the mobo out from the base cover.
8) unscrew the HSF and reapply the thermal compound.
9) reverse everything.

my only failure so far is that, now i got 1 extra screw which i don't know where it come from.

If you check the Manual.. to remove system board you need to:
The disassemble video on front page is totally different for my model.

Not by much. You can try keep the bottom panel open if u rarely go mobile.