I need even more 286 help. \ VOGONS

I need even more 286 help.

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First post, by nemesis

Posted on 2015-06-06, 00:08

nemesis Offline

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Posts: 375
Joined: 2011-01-18, 21:05

I recently acquired this little Motherboard:

It's a beauty, but for some reason, will not boot. Every time I turn on the AT PSU, it just quietly clicks at me (fan moves very slightly on PSU).
My 486 motherboards work with the PSU, so I think that I've narrowed it down to the 286 Motherboard.
I checked all power connections, standoffs, and peripherals. Everything seems to be fine.
Another Picture:

I believe that the Motherboard is called: HAM/12-V2.
286 is not my strong suit, so any advice is appreciated.

Reply 1 of 3, by 133MHz

Posted on 2015-06-06, 00:31

133MHz Offline

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If the PSU is shutting down you have a short circuit on a voltage rail. Take a multimeter and measure the resistance between each voltage pin and ground on the AT power connector, once you identify the shorted rail we can start narrowing it down.

http://133FSB.wordpress.com

Reply 2 of 3, by badmojo

Posted on 2015-06-06, 02:01

badmojo Offline

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Has that battery started to go? Maybe it's burnt through a trace.

Life? Don't talk to me about life.

Reply 3 of 3, by nemesis

Posted on 2015-06-06, 16:15

nemesis Offline

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Rank: Member
Posts: 375
Joined: 2011-01-18, 21:05

133MHz wrote:
If the PSU is shutting down you have a short circuit on a voltage rail. Take a multimeter and measure the resistance between each voltage pin and ground on the AT power connector, once you identify the shorted rail we can start narrowing it down.

OK. I dug out my multimeter and I'm trying to figure out what range I'm looking for. Sadly, I know very little about electrical engineering, so I'm hoping that ~182 on each of the 5V connectors is normal (I won't be offended if you laugh at me). 🤣 Please bear with me, as I'm really trying to figure this out.

badmojo wrote:
Has that battery started to go? Maybe it's burnt through a trace.

I have done a close examination of the battery and it looks to be in new condition.

Thank you, guys (or girls, I really don't know your genders) for your assistance thus far.

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