This Hewlett Packard Pavilion DV3 laptop came in because it switches itself off after 20 minutes. My initial thought was that the laptop was overheating either by a stuck fan or a build up of dust.

HP Pavilion DV3

HP Pavilion DV3

Inside the fan was spinning and there was no dust. After cleaning and reapplying thermal paste to the existing CPU there was no change.  I then changed the CPU but the problem persisted. In the end I put it down to the motherboard or a component on the motherboard overheating. The photos below show what the laptop looks like inside.

Keyboard and panel above keyboard removed

Keyboard and panel above keyboard removed

Keyboard, top panel and screen removed

Keyboard, top panel and screen removed

Underneath the top panel

Underneath the top panel. Back of track pad is centre bottom.

 
Motherboard removed from chassis - view from bottom with heat sink and fan in place.
Motherboard removed from chassis - view from top,

Motherboard removed from chassis – view from bottom with heat sink and fan removed.

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