Isa-486sv2 3.10 won't post \ VOGONS

Isa-486sv2 3.10 won't post

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First post, by CachoAlpuy

Posted on 2022-11-22, 22:21

CachoAlpuy Offline

Rank Newbie

Rank: Newbie
Posts: 67
Joined: 2020-01-16, 20:31

Hi, I have an isa-486sv2 Asus motherboard which won't post, I repaired a broken trace due to battery leakage and checked the rest of the traces.
If I power it with the kb controller chip the post card doesn't show any code, and if I remove the keyboard controller I get the codes like in this video, the codes loop:
https://youtu.be/BIph08LbXIA

How can I trace the problem?

Reply 1 of 1, by rasz_pl

Posted on 2022-11-23, 04:33

rasz_pl Offline

Rank l33t

Rank: l33t
Posts: 4447
Joined: 2017-06-04, 00:57

keep looking for more corrosion damage, maybe under keyb controller socket, maybe under those two chips inside it, maybe under ISA slot

https://github.com/raszpl/sigrok-disk FM/MFM/RLL decoder
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module (AT&T Globalyst)
https://github.com/raszpl/386RC-16 ram board
https://github.com/raszpl/440BX Reference Design adapted to Kicad

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