SS7 board with keyboard leds flashing/blinking \ VOGONS

SS7 board with keyboard leds flashing/blinking

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First post, by kixs

Posted on 2016-05-11, 07:02

kixs Offline

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Hello,

I have a SS7 board model NMC-5VMe (looks like EPOX MVP3C). When I power it up it POSTs fine only keyboard leds are blinking non-stop and so keyboard doesn't work at all. They are blinking from the power on.

What could be wrong?

I tried both AT and ATX power supply. Capacitors look good and there is nothing suspicious around the keyboard connector (by the naked eye). I'm using PS2-DIN adapter, but so far this hasn't been an issue. At the moment I don't have any normal DIN keyboard at hand.

Thanks

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Reply 1 of 10, by Imperious

Posted on 2016-05-11, 10:01

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I can't find any easy answer to Your problem, but can verify that Your motherboard is the same as a Epox EP-MVP3C2
http://www.lilmonster.com/manuals/epox_MVP3C_2.pdf

Try another PS2 Keyboard if You haven't already.

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Reply 2 of 10, by mmx_91

Posted on 2016-05-11, 13:20

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AFAIK, Mvp3 should take usb keyboards, as well as Ali boards do. You can try with a modern usb one (by using a standard usb header) to check if the problem is the onboard keyboard circuitry.

Reply 3 of 10, by candle_86

Posted on 2016-05-11, 14:27

candle_86 Offline

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mmx_91 wrote:
AFAIK, Mvp3 should take usb keyboards, as well as Ali boards do. You can try with a modern usb one (by using a standard usb header) to check if the problem is the onboard keyboard circuitry.

the board doesn't have a standard header, it has an EPOX 20 pin mess

Reply 4 of 10, by kixs

Posted on 2016-05-11, 17:25

kixs Offline

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- already tried with another PS2 keyboard - no difference
- thought about USB... but USB keyboard function has to be enabled in the BIOS. By default it's disabled

As it looks now I'll use it for parts. I've a few Epox MVP3 boards with bad caps.

I have too much untested stuff and it seems a lot of it is broken one way or the other 🙁 I kinda like this board though.

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Reply 5 of 10, by nforce4max

Posted on 2016-05-11, 18:03

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I wouldn't scrap this board, those Epox boards are getting stupid rare and the prices can be crazy in my part of the world. Just put it in a anti static bag and put it away for later.

On a far away planet reading your posts in the year 10,191.

Reply 6 of 10, by kixs

Posted on 2016-05-11, 18:17

kixs Offline

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Of course I won't scrap it anytime soon. But I'm not sure what can be done with it as the functional keyboard is a must in my book 😕

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Reply 7 of 10, by candle_86

Posted on 2016-05-11, 21:35

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did you try an AT keyboard or only PS2?

Reply 8 of 10, by kixs

Posted on 2016-05-12, 05:25

kixs Offline

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I used PS/2 keyboard with AT(DIN) adapter. I use this almost exclusively for years now. As said before I don't have a real AT keyboard at hand (it's all packed away). I will try with real AT keyboard once I get to it.

I haven't seen this kind of behaviour before and that's why I'm asking if someone else did.

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Reply 9 of 10, by 133MHz

Posted on 2016-05-12, 05:49

133MHz Offline

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Do you have the +5V VCC present at the keyboard connector? It could be missing (blown fuse/severed trace) and the keyboard could be trying to power itself up from the data/clock lines by voltage backfeeding through clamping diodes, causing such erratic/intermittent behavior.

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