PC motherboard USB 5v circuit fried

[ChronosHD]

Hi Community,

I have unfortunately fried the 5v circuit of my motherboard and when I troubleshooted, I figured USBs work but don't get power, as using an external powered hub awakes them.

I'm comfortable with fixing electronics, but I'm clueless what component to check and replace. I've checked fuses for USB and they show 0 resisrence, I guess that's good.

Can somebody guide me please?

The motherboard is an Asus H110 Intel, from a Asus g11cd desktop.

Much appreciated in advance!

[Hamelec]

is the via hole burned?

[ChronosHD]

I don't think so, see zoom in photo attached.

[coromonadalix]

the black   p 260 written on it  smd part near a capacitor  1st photo    should be a fuse  or a poly fuse / at least seems like a fuse

Check its continuity   

Can you dust off over the 2 black ic's near the usb sockets,  cant read them   

thks

[ChronosHD]

136 bbUJG, is that what you ask for?

P260 conducts clean.

[mariush]

those bbUJG parts could be ESD protection chips

[ChronosHD]

How do I know if that's the problem, checking conductivity?

[ChronosHD]

Bump

[fzabkar]

Those ESD protection parts contain TVS diodes. Check whether any of the USB pins (other than Ground) are shorted to ground.

Measure the voltage on either side of the polyfuse. If +5V is not present, then locate the source of the Vbus supply by performing a continuity test between the polyfuse and the various DC-DC converters. Upload a detailed photo of the motherboard if you need help with this.