Dead usb ports on Acer Aspire 5740g

[Scootie]

Recently bought of someone this dead laptop. It received majore liquid incursion and the board was dead, everything else checked out good. So I bought for 30£ another motherboard off ebay and by changing the kbc chip and programming a new bios I managed to fire it and later ansamble it. However, I noticed this moment the the external usb board conected through a cable to the mainboard couldnt enter in it's socket because 2 pins were inshort and I already started a few times the laptop.
Now the usb are dead, my electrician checked them out to be okay but something is still missing. Is it possible that the bd is broken cause of the short I found? Do I have to replace that?

[dj_ricoh]

Re: Dead usb ports on Acer Aspire 5740g

you need to change them.
open the notebook again and when you replace check to see if there is 5v supply.

Bafta!

[Scootie]

Re: Dead usb ports on Acer Aspire 5740g

5v is present.

[dj_ricoh]

Re: Dead usb ports on Acer Aspire 5740g

So? Whats the problem then.
If you got 5v there and a working usb in the notebook extend from a working one with wires but use the original supply.
Easy. Its like making a hub in the laptop.
If you don't then thats bad then we rly talk.

[Scootie]

Re: Dead usb ports on Acer Aspire 5740g

Well, when I said they are dead I really ment that. If i try to attach a mouse or flash drive to either hubs the windows keeps telling me that it cant recognize the device and only stops these messages if I restart the machine. That was the moment when someone told that the bd is faulty and needs to be replaced.

[dj_ricoh]

Re: Dead usb ports on Acer Aspire 5740g

Motherboard Code!
so we can see that chip.
Wistron JV50-CP?

[dj_ricoh]

Re: Dead usb ports on Acer Aspire 5740g

this notebook has a foil that extend to the Mobo with the USB.
disconnect it and check the other usb.

[Scootie]

Re: Dead usb ports on Acer Aspire 5740g

48.4gd01.01m
Currently the laptop is at work, cant give anymore details.

[Scootie]

Re: Dead usb ports on Acer Aspire 5740g

disconnect it and check the other usb.

I'm not sure what you ment by that. The 2x usb port on the right side that are extended thourgh a cable to the mobo?

[dj_ricoh]

Re: Dead usb ports on Acer Aspire 5740g

yes! those from the right side got a cable right? unplug the ribbon from the right side and check the left side
left side its on mobo near VGA port

[spleenharvester]

Re: Dead usb ports on Acer Aspire 5740g

So just to clarify, ALL usb ports are dead? Or just the ones on the right side?

[Scootie]

Re: Dead usb ports on Acer Aspire 5740g

As I mentioned in my original post, the conector that goes to the 2x right usb's had 2 pins shorted. Something I only found out when I wanted to put togheter the laptop and the jack didnt fit in properly.
The 2x usb on the mainboard are dead as well, one kept functioning for awhile, it could control the mouse but after sometime it died too.
So now, all are dead.

[atsio]

Re: Dead usb ports on Acer Aspire 5740g

If as you say have 5v on usb connectors then you need to change the PCH chip.

[spleenharvester]

Re: Dead usb ports on Acer Aspire 5740g

This sounds like PCH to me too.

[Scootie]

Re: Dead usb ports on Acer Aspire 5740g

You mean the Bd82hm55(southbridge)?

[atsio]

Re: Dead usb ports on Acer Aspire 5740g

It is doing both the jobs of Southbridge and Northbridge (integrated graphics) and Intel call it Platform Controller Hub (PCH)

[Scootie]

Re: Dead usb ports on Acer Aspire 5740g

Thank you. I ordered a pch. My only problem now is that these chips use 0.35mm balls which is blast to work with. I once experimented with changing one and it didnt work. Let's hope I'll have more luck this time.

[Scootie]

Re: Dead usb ports on Acer Aspire 5740g

Topic is old but I managed the other weak to repair this laptop. Got a new pch and changed it. Now all usb port work without problems. I just have to find the damned wifi card, after so much time God knows where I put it.