HP probook 650 G2

[Jane]

I have HP PROBOOK 650 G2 with mainboard CIRCUS-6050A2723701-MB-A02
.
There is a short. On the path of transistor Q60001. Its source pins are on the paths that is shorted - 0 Ohm to ground.
The transistor itself seems to be good - I desoldered the transistor but the short remains
I tried to use a thermal camera but it did not detect the real short,probably 1,7 A with used 1.9V is not enough to generate enough heat.
Is there a schematic available?
Or how to continue?
Thank you for help

[mon2]

Re: HP probook 650 G2

What are the markings of the removed mosfet?

[SMDFlea]

Re: HP probook 650 G2

Is there a schematic available?

You can ask here in one of these threads but doesn`t seem to be available yet,even on paid sites

https://www.badcaps.net/forum/showth...2723701-MB-A02
https://www.badcaps.net/forum/showth...2723701-MB-A02

[Jane]

Re: HP probook 650 G2

@mon2:The marking is 7752 so I think it is AON7752, datasheet at
https://cdn.badcaps-static.com/pdfs/...f48d97f10b.pdf

[reformatt]

Re: HP probook 650 G2

From the image, I'd say its the low side MOSFET of a switching pair (Q60000/Q60001), so ground on source is to be expected.

Locate your current sense resistor after ACFET/RBFET (which look to be Q60010 and Q60011) and check for a short to ground is usually where I start. Then check each sub-rail for a short if you are getting 19V past that pair. Q60012 is probably reverse polarity protection.