M17x r5 burnt motherboard chip

Hi today i felt an electronic smell from my alienware and located burnt chip (see photo) QV12 six legs,completely burnt ,laptop still works however has anybody idea what that was? I desoldered later that chip but couldn't see anything as it was all melted

Any ideas?

 

What is that port (at the bottom on the photo) that is near the location of the damage?

Furthermore, is the laptop still under warranty?

Sent from my XT1575 using Tapatalk

 

It must be related to pci-e express port for graphics card.
May be you don't notice anything because your running it onboard graphics.
You can test the port with an working graphics card.

 

Was there a liquid spill?

 

That's a transistor most likely. Usually a short will do that.

 

Hi sorry for delay been on holiday so now laptop displays only through hdmi ,monitor is checked as the cable is ,there is no backlight ,when i put flashlight i can see everything however is very dim,hdmi output is ok and gtx770m is allright i put unigine valley benchmark and score 1400 seems to be all right with temperature 60 Celsius, there was no liquid damage, port at the bottom is mxm for graphic card ,i attached 2 photos ,first one shows real place of the chip ,second how that chip looked like.So my question is can that chip be responsible for backlight?
Can somebody read me what's written on it from working one?
Replacing it its not so hard however must find out its name and wtf is that
chip or transistor
Thx for help

 

Looks like power mosfets (DC->DC converter), because of the six feet and the way they're hooked up; all left pins are joined. Which makes no sense otherwise, except if it were for a power application. Also, it matches your backlight problem; most everything laptop is 3.3V or 5V, but the backlight needs up to 21V, so you need some way to supply that. Plus, this is a heavy-duty application, so prone to heat up under load (and burn plastic, it seems).

Try something like these. Not sure about the resistance value, better use the 50 mΩ. You also want a multimeter; check input voltage and everything from pin #3 (bottom right, the dot is pin #1) and onwards. There's a chance it took out some smaller components after the mosfet as well.

 

Solved

Just found old dead mobo from inspiron 7720 and soldered 6 feet similar chip and voilaaaa it works,
Just wonder what caused that burn?
Thx for help

 

Nice work This is why I don't throw out old motherboards. You never know what you can salvage from them.