486 troubleshooting \ VOGONS

486 troubleshooting

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First post, by elod

Posted on 2016-10-08, 12:36

elod Offline

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I bought a 486 board with an AMD 5x86@133MHz CPU and some RAM that does not POST. It's an LS-486E rev.C2, SiS PCI chipset. http://motherboards.mbarron.net/models/486pci/ls486ec2.htm

When it arrived it had the CPU rotated by 90 degrees, I caught this right away.

VREG is set correctly (multimeter reads 3.4V), all other jumpers were set up right.
If I'm not mistaken it should beep even without a CPU and RAM, right?

What would you suggest I try besides battery replacement that did not help and maybe BIOS and cache reinsertion?

Does a 486 CPU/board survive a powerup with the CPU mounted wrong?

Reply 1 of 3, by Anonymous Coward

Posted on 2016-10-08, 12:56

Anonymous Coward Offline

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Depends on the board, and which way the CPU is oriented.

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 2 of 3, by Deksor

Posted on 2016-10-08, 13:25

Deksor Offline

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I rotated a DX2-80 at 180° by mistake. It died, but the mobo survived

Trying to identify old hardware ? Visit The retro web - Project's thread The Retro Web project - a stason.org/TH99 alternative

Reply 3 of 3, by Mut

Posted on 2016-10-10, 15:10

Mut Offline

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If everything is fine in the visual inspection, all votages are ok and jumpers are correct, check the bios, recently i revived a Atrend ATC1425 and a Soyo 4SAW2 only reflashing a new bios. I have a cheap willem programmer, but you can try this doing a hot swap or using a old nic and the uniflash utility.

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