Zida 4DPS 2.1 stuck at POST \ VOGONS

Zida 4DPS 2.1 stuck at POST

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First post, by jsliderex

Posted on 2023-09-27, 18:47

jsliderex Offline

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Posts: 9
Joined: 2023-06-22, 15:26

Dear vogons community,

Maybe someone can help me with my issue.
This board started acting up a few days ago, first i was only able to POST after repowering 3 or 4 times,
now it does not POST at all, it gets stuck at the CPU info.

Test card shows POST codes 18 & 16, which are interrupt contoller tests.

I already swapped out FPM ram, flashed different bios revisions, inspected the board for damaged traces and
removed the cache.

Can you point me in a direction? Maybe it is a failed chip or something 🙁

Thank you in advance!

Reply 1 of 5, by dominusprog

Posted on 2023-09-28, 12:21

dominusprog Offline

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Location: Innsmouth

Remove the TAG chip and try again.

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Reply 2 of 5, by jsliderex

Posted on 2023-09-29, 07:16

jsliderex Offline

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Joined: 2023-06-22, 15:26

Thank you for your input dominusprog 😀

It was not the TAG Chip, but there is an update:
i replaced the W83787F and the W83767BF with identical chips from a donor board,
now it posts but does not recognize any ide devices or the floppy disk.

If i put a controller card via ISA in and connect HDD/FDD to it, everything works fine!

I think i will try to replace the 85C497 next

Greetings!

Reply 3 of 5, by CharlieFoxtrot

Posted on 2023-09-29, 10:14

CharlieFoxtrot Offline

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Is there any visible trace damage on the board? Especially on the lines between BIOS and controller chips?

Reply 4 of 5, by jsliderex

Posted on 2023-10-14, 14:15

jsliderex Offline

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Rank: Newbie
Posts: 9
Joined: 2023-06-22, 15:26

Update No. 2:

I replaced the whole chipset, Board is POSTing and it recognizes the floppy drive.
Unfortunately it doesn't detect the HDD on the primary IDE port, on the secondary
it is detected fine.

Reply 5 of 5, by majestyk

Posted on 2023-10-14, 18:19

majestyk Offline

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Joined: 2020-12-04, 09:13

The 85C496 provides a PCI IDE controller and the Winbond Super-I/O has 2 AT-bus (ISA) IDE interfaces.
I´m sure you did some measuring / tracing the connections - are both IDE connectors hooked to one of the chips or is each one connected to one of them?
You need to be sure before you can continue the troubleshooting.

Please note the "PCI"-IDE connector(s) that are connected to the 85C496 are buffered. Did you check the buffers carefully / replaced them.
You never know if someone inserted the plug of an IDE cable in the wrong position...

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