Question about MSI MBOX PM8M2-V (MBOXPM8M2V) Barebone

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Loss of power to onboard USB and PS2 ports

The Vcc supply of one of the onboard USB ports was shorted, there is now no power to any of the onboard USB ports or the PS2 ports. I assume the is a fuseable link on the motherboard somewhere ?? I have have reset the drivers etc and it appears to be hardware issue

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Hi, I checked a known good spare motherboard with a VOM (continuity tester): pin 4 of the KB PS2 port, pin 1 of the rear USB, pin 1 & 2 of the front panel USB onboard connector, pin 3 of the infrared, pin 4 of the speaker connector, pins 4, 6,21 & 22 of the ATX 24-pin Power Connector are all interconnected (+5VDC). If that is an indication of the general +5 supply layout, you can probably hard wire a new +5 supply line to where the +5 is gone from where it is still available. Of course without a schematic, I might be off. Determining the actual component position of the surface mounted fuse (or fusible link) might not be that easy since manufacturer do not publish such information loosely. A shotgun approach (test all) would be time consuming but of course challenging. Your best bet would probably be as mentioned earlier, hardwire and install in series with the new +5 line a low amp (500ma or lower) smfuse. This article describes the power requirement of USB ports > http://pinouts.ru/Slots/USB_pinout.shtml. Hope this be of some help to you. Pls post again how things turn up. Good luck and kind regards.

Posted on Aug 18, 2007

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