Biostar MB8433UUD-A KB and Mouse stop working \ VOGONS

Biostar MB8433UUD-A KB and Mouse stop working

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First post, by kanecvr

Posted on 2015-07-30, 00:51

kanecvr Offline

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Hi guys. Been a while since I posted (my other hobby is taking up most of my summer and wallet).

So I have a Biostar MB8433UUD-A socket 3 UMC chipset board - the fastest socket 3 board I have - but I can't use it for more than 10-15 minutes because all input stops working after a while - it's like the keyboard and mouse have been physically disconnected (PC keeps running). The thing was rescued from a recycling center and was grimy and a little beat up, but it runs nevertheless.

The board's DIN connector (the big one) was a little loose, so I tough that was causing the problem. I removed it and replaced it with a new one, but the problem persists. Next, I looked at the soldered PS/2 port - it's nice and solid, no apparent damage - but I connected a PS/2 header to the pins behind it just to make sure - same issue - kb and mouse stop working after a while. Also, funny thing is, the board will only work with one of my PS/2 mice - a logitech - it fails to detect any other PS/2 mouse.

What could be causing the problem? Could it have a short somewhere? Is it possible it's not supplying correct voltage to the kb / mouse? Has anyone encountered something like this before?

P.S. - I did update the BIOS to a later version so I could use an 8GB HDD - could this be related?

Reply 1 of 4, by alexanrs

Posted on 2015-07-30, 01:39

alexanrs Offline

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This kindda sounds like a bad solder joint (once it heats up, it looses connection). Does the keyboard/mice still get power once it stops working? Try following the traces from the keyboard and mice and see if anything is bad. Also, this board looks like it has a place to solder a socket and install an external keyboard connector. Try analysing it and see if the socket is all that is missing (and perhaps the jumper to select it), or if the passive circuitry is also incomplete.

Reply 2 of 4, by kanecvr

Posted on 2015-07-30, 16:17

kanecvr Offline

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alexanrs wrote:
This kindda sounds like a bad solder joint (once it heats up, it looses connection). Does the keyboard/mice still get power once it stops working? Try following the traces from the keyboard and mice and see if anything is bad. Also, this board looks like it has a place to solder a socket and install an external keyboard connector. Try analysing it and see if the socket is all that is missing (and perhaps the jumper to select it), or if the passive circuitry is also incomplete.

I've tried using the external mouse connector - same issue. The kb and mouse are still powered when the issue occurs. There are no missing electronics on the board - I checked thoroughly.

Reply 3 of 4, by alexanrs

Posted on 2015-07-30, 16:22

alexanrs Offline

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Maybe the solder joint isn't on the connectors, but on the controller itself. Since there is no external controller here (it should be on those empty pads near the RTC and the ISA slots), I assume it is integrated onto the chipset. If the chipset has a bad solder joint, this might happen once it heats up a little.

Reply 4 of 4, by kanecvr

Posted on 2015-07-30, 16:33

kanecvr Offline

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That's entirely possible. I'll give the chip a once over with my SMD.

Edited: - finished, issue still persists. I think there's something along the way that's causing the problem.

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