AAEON SBC-410 \ VOGONS

AAEON SBC-410

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First post, by i486_inside

Posted on 2017-07-23, 03:24

i486_inside Offline

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I purchased this 486 SBC off eBay, and when I plugged it into my backplane it would not post, there is a power light that blinks but that is all it does, I know it is getting power becuase of the LED and that I used my multimeter to probe the power connector on the card and it had the appropriate voltages. The power connector is provided to use the card strictly as an SBC without a passive backplane and is not required if using the card in a passive back plane. I tried all of the normal things, I reseated the CPU, the Bios, the Cache chips , the ram, I tried different ram, I set the bus jumpers to 25mhz down from the 33mhz default. I have no Idea what CPU is on the card since the heatsink is epoxied and there are no markings on the CPUm but I tried the CPu at 4V and then 5V and it didn't help either. I suspect the card got fried from static since it was wrapped in plain bubble wrap and sitting in packing peanuts when it arrived to me. I got a full refund from the seller already so I didn't lose anything.

Does anybody have any Idea whether there may be something repairably wrong with it or do you think it is completely dead.

Reply 1 of 3, by Moogle!

Posted on 2017-07-23, 03:44

Moogle! Offline

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Is the backplane required for POST?

Reply 2 of 3, by i486_inside

Posted on 2017-07-23, 04:14

i486_inside Offline

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I tried it with just an AT power supply connected to it and the keyboard started responding. So I put it back in the backplane and took out all the cards except the cirrus VGA card again like I did the other day still no post, so I tried a trident card I had laying around same result, but then I stole the tseng et4000 out of my CompuAdd, and it finnally posted. It appears the clock chip is dead because it gives the low battery warning, and there is an option an option in the bios about onboard video that I diabled and apon reboot it was reenabled, my guess is that option may be giving it trouble becauase there is no onboard video, so i need to desolder the clock chip and put in a socket and one of the new DS12887s I bought.

Reply 3 of 3, by i486_inside

Posted on 2017-07-23, 05:17

i486_inside Offline

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The CPU is a DX2 66 Enhanced Am486 w/ 16KB of WB cache, which was probably the only DX2 66 that you could still get when this card was manufactured at the beginning of 2000.
The thing won't post if I have my Aztech Galaxy Nova 16 (PB OEM) sound card plugged in.
The memory module with the card is only 4MB.
I replaced the clock chip the original was an ST M48T86 manufactured the 48th week of 99' , the new clock chip is a Dallas DS12887A+ manufactured the 31st week of 16'.
The sockets I bought are the machined pin kind, they are kind of annoying to solder because the solder flows so perfectly around the round pins that you can't tell if the solder has actually flowed unless you get very close whereas with the flatter pins on the double wipe sockets are much more obvious that the solder has flowed around them.

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