HELP. Burnt component on GT72 motherboard

Hi everyone,
I need your help! A MSI GT72 motherboard I got has a burnt MOSFET (Q24) next to the MXM slot and the RAM slot.
I was able to pull a large picture from the internet but it's not clear enough for me to read the inscription on the MOSFET itself.
Could you help me out?
Thanks fellas.

 

Pinging @Khenglish
Any chance you can mail him the board? He can fix it for you but please reimburse him for his hard work. He's probably the only person here besides brother @Prema who is capable of this.

 

Judging from the location it will be a power switch for the 19V rail to the MXM slot. It will be a p-channel FET. The other side of the board should have the same transistor in parallel that you can read a part number off of, or you can just buy any 5x6 mm pFET. Look for something under 30 mOhm, the lower the better.

 

Thanks mates!
I'll try to see if there is the same transistor on the other side of the board.
Do you think I can replace it with any 5x6 pFET? I can most probably find that on a cannibalized old Packard Bell LJ65 motherboard.

 

Spend 3-4$/€ and buy a decent know good part from Mouser/Digikey, worst case, from eBay, thats an old laptop, its MOSFETs wont be all that good.

 

Hi, on the other side, there's a APL5930 VR730 SOP8 chip. Is that what you were talking about? It's labeled PU10 on the mobo. Burnt component is labelled Q10.
I also found a Q3 labelled (8 pin MOSFET) somewhere else on the other side of the board: AO4413 BA5H1T is the reference. Could it be that one instead?
Thanks again for taking time to answer me.

 

Q3 looks right. Is the burned component labeled Q2 or Q4?

 

Burnt component is Q10 actually, the one next to the MXM port

 

Hmm, usually FETs in parallel are one digit away in numbering. That AO4413 is still the right type of FET though. You can put in that or anything that matches the following criteria:

p channel
Vds max of -30V
5x6mm form factor
Rds on < 15 mOhm. Lower is better.

Mouser and Digikey are good places to find FETs.

Does the system work anyway despite the blown FET? It's almost always supposed to be on anyway, so if it's melted and shorted it might not really matter.

 

It may be unstable somewhere along the line if the circuit is damaged. Also, a motherboard has multiple layers so what if the circuit in the under layer is also damaged from the burn?

 

I have found that blown power FETs do not damage the circuit board. Blown high voltage caps can though.

 

I see.
@johnbb were you able to get the board repaired?

 

Actually I'm a bit scared to run it again with that blow MOSFET?
Should I leave it like that or should I try to remove it with a heat gun first, and clean everything with isopropyl alcohol?

 

It's definitely best to remove and replace it. I'm just curious if you tried it.

 

If you had it repaired then try, but if you experience stability issues then just change it.
I would go with replacement with better peace of mind rather than to be concerned with unknown issues.

 

Thanks I'll go to an electronic shop to have it repaired but a refurbished GT72 motherboard is super expensive...
If it's dead, I'll sell the rest of the laptop for parts...

 

The damn motherboard works indeed even with the burnt MOSFET ! Nice to see the 6820HK back in action!
I got the new one so when I have a few hours to spare I'll do the soldering.
Thanks for the help, I'll let you know how it ends up.

 

Good to know.