Where can i get schematic diagram for Asus M4A88TD-V evo/usb3 motherboard?

[Suka]

Just trying to fix a USB over current problem that is still plaguing my mobo. Any help?

 

[brandonwh64]

Unplug the front USB from the motherboard and try to boot it. If that works then your USB ports on the case are damaged

 

[McSteel]

Get the motherboard out of the case it's currently in, visually inspect all the USB ports on the board to see if there's a damaged/shorted one then test the system with the bare minimum of components (just the CPU+heatsink and one stick of RAM) and power it up to see if it's working.

If not, probably one of the internal USB hubs is screwed.

Make sure to check there isn't any metal debris stuck to the board shorting something out.

Finally, try with a different power supply.

If the motherboard is still erroring out (I see you reset the BIOS already), then chuck it and get a new one.

 

[Suka]

Unplug the front USB from the motherboard and try to boot it. If that works then your USB ports on the case are damaged

I have tried that including other tricks that i found on the internet.

 

[Suka]

Get the motherboard out of the case it's currently in, visually inspect all the USB ports on the board to see if there's a damaged/shorted one then test the system with the bare minimum of components (just the CPU+heatsink and one stick of RAM) and power it up to see if it's working.

If not, probably one of the internal USB hubs is screwed.

Make sure to check there isn't any metal debris stuck to the board shorting something out.

Finally, try with a different power supply.

If the motherboard is still erroring out (I see you reset the BIOS already), then chuck it and get a new one.

Tried this too. Removing battery, BIOS reset , booting with min components, diff power supply, but still nothing.

 

[brandonwh64]

Have you taken a flash light and looked inside the motherboard USB ports to see if there is anything stuck in there or bent that could possibly be touching anything? Only other option I know is to check the USB controller on the board to see if its damaged or burnt.

McSteel ninja'd me LOL but yea that

 

[Suka]

Have you taken a flash light and looked inside the motherboard USB ports to see if there is anything stuck in there or bent that could possibly be touching anything? Only other option I know is to check the USB controller on the board to see if its damaged or burnt.

McSteel ninja'd me LOL but yea that

Did that. I even washed the mobo itself and even removed a USB 3 controller from the mobo(desoldered it), still it won't boot.

 

[McSteel]

Ah, then you're looking to get to the bottom of the issue out of a combination of curiosity and frustration.

I've been there, as I fiddle around with electronics as well... In this instance, I don't think it's worth it.

You're looking to find out where the OCP circuitry is and where it gets its cues from? AFAIK there should be something like the National Semi's LM3544 or a similar USB power splitter with built-in OCP tied to the BIOS chip's external data pin... I don't think the USB3 is triggering the OCP warning, which you basically proved by desoldering the controller (which itself offers OCP protection).

Not sure about that board exactly but you ain't gonna find a block diagram anywhere outside ASUS' in-house service premises... Just look at all the ICs on the board and look them up online, there's no easier way.

It's a 4-layer board, so tracing the connections will be tricky. Internal layers are the power and the ground plane anyway, data goes on top and bottom.

 

[Suka]

Ah, then you're looking to get to the bottom of the issue out of a combination of curiosity and frustration.

I've been there, as I fiddle around with electronics as well... In this instance, I don't think it's worth it.

You're looking to find out where the OCP circuitry is and where it gets its cues from? AFAIK there should be something like the National Semi's LM3544 or a similar USB power splitter with built-in OCP tied to the BIOS chip's external data pin... I don't think the USB3 is triggering the OCP warning, which you basically proved by desoldering the controller (which itself offers OCP protection).

Not sure about that board exactly but you ain't gonna find a block diagram anywhere outside ASUS' in-house service premises... Just look at all the ICs on the board and look them up online, there's no easier way.

It's a 4-layer board, so tracing the connections will be tricky. Internal layers are the power and the ground plane anyway, data goes on top and bottom.

Spot on. I am frustrated because am powerless hence the extremes. I will try your suggestion.