Re: Troubleshooting Asus PCI/I-P54SP4 no boot

Posted on 2024-02-03, 19:32

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Solved - I have flashed older bios from 1995 (the last one is 1998) and the cache and all the other functions are working OK now and the board behaves as it should. The bioses all available here; https://theretroweb.com/

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Re: Troubleshooting Asus PCI/I-P54SP4 no boot

Posted on 2024-02-03, 13:45

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sorry for the necro-posing, but I am a Necromancer. :-) Sad there are no more post how it went with this particular board. I can confirm the problem might have been in loose pins on the QFP chips. I had dead board of the same type and one chip (SIS 503) had almost left the board. The other one had …

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Re: 286 TwinHead TH4100 no post - I am stuck

Posted on 2024-01-17, 15:24

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This does eem to be a very rare board. I recently got my hands on this same board, so far the only issue is a dead RAM chip. The board has DIP sockets silkscreened around to indicate SIMM banks. I assume these are for SIP modules. Instead of replacing the faulty 4256 chips I wanted to either add …

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Re: Fixing a not working USB port (on a PIII)

Posted on 2023-11-20, 09:56

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by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hallo, considered you have tested more cable sets I would not blame the ribbon cables then. It is super weird you have problems with you FDD as well. Please check your board layout, but I am pretty positive your FDD is not in the same chip as your IDE. Most likely you have super IO that includes FDD …

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Re: Fixing a not working USB port (on a PIII)

Posted on 2023-11-17, 12:19

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Good to hear about your progess! You have found the solution before I managed to answer. Yes, you did it right - some older boards need this bridging - sometimes you are choosing if the back ports or front usb are connected - I have seen a sticker on a case - with a warning about it. Most likely …

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Re: Fixing a not working USB port (on a PIII)

Posted on 2023-11-16, 13:12

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Speaking about the USB - if you are measuring weirdo resistance and it differs a lot from the working port I would say you have found the problem. You can try to trace the line from the port to the chipset. I would expect some resistors in the way. There could be some potential damage. Or as you …

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Re: ocket 7 board do not work with dual voltage (MMX) CPUs (qdi-p5i430vx-250dm-v3)

Posted on 2023-11-15, 22:48

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

EDIT: the board has been fixed. I have used a shotgun approach, desoldered all the transistors, mosfets and voltage references in the power stage. All transistors tested as good on my LC tester. But I can ´ test voltage ref. So nothing to lose. I have salavged the same references from a more damaged …

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Re: 286 TwinHead TH4100 no post - I am stuck

Posted on 2023-11-15, 11:48

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

EDIT : hallo guys, just to conclude - the board has been fixed. - I have replaced all the memory sockets - I have found some bad chips in the original memory set - I have fixed a bad trace leading to a ceramics capacitors (later on replaced the capacitor as well) which is responsible for "de- …

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ocket 7 board do not work with dual voltage (MMX) CPUs (qdi-p5i430vx-250dm-v3)

Posted on 2023-11-15, 11:32

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hallo guys, I have pulled out this bad boy from my last scrap haul. To make it easier there is a link - I have exactly this version of the board. https://theretroweb.com/motherboards/s/qdi-p5i430vx-250dm-v3-0-s3-1-explorer-ii-sp I have made it to run, fortunately there were just a bit damaged ram …

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Re: Fixing a not working USB port (on a PIII)

Posted on 2023-11-15, 11:15

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

...and as another person here mentiond - weird random issues can be cuased ba bad capcitors. I have seen boards where such a failure cused IDE drive problems and even data coruption. It is not the most common failure - mostly the CPU VRM caps fail and the PC become unstable or dead, but the …

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Re: Fixing a not working USB port (on a PIII)

Posted on 2023-11-15, 11:09

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Absolutely. I would not relate the IDE and USB problem at first. Me personaly I have a very bad experience with the SATA - IDE contraptioins. Basically it works someties somewhere...and causing issues on many boards. I have put the thing aside. He needs one known good drive to check. I would even …

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Re: Fixing a not working USB port (on a PIII)

Posted on 2023-11-15, 11:05

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hallo, if you chipset is failing, there is unfortunately not much you can do. Or to be more precise not much that worth it in a case of PIII board. There is a chance your BGA chip is loosing connection with your board hence you are experiencing random problems. There are two ways of possible repair: …

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Re: The dead Sound blaster 16 CT2230

Posted on 2023-11-15, 09:22

by

by H.W.Necromancer

in Marvin \ Sound

in Marvin \ Sound

Sorry for confusing post. But maybe there can be a common fault causing a good looking card not beeing detected. My version is a different SB16 but the same symptoms as the guy who have started this thread. See photo - the card is looking as good as new! - edge connector cleaned for sure - power …

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Re: The dead Sound blaster 16 CT2230

Posted on 2023-11-07, 18:05

by

by H.W.Necromancer

in Marvin \ Sound

in Marvin \ Sound

Guys, sorry for necroposting. 😂 But I have got my hands on a sligthly newer SB16 with the same symptoms. Card simply not visible. Sad this post faded out. But 74LS of oscilator is a good hint - need to get a scope 🤨

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Re: 286 TwinHead TH4100 no post - I am stuck

Posted on 2023-08-09, 20:37

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Usually a cap too big will slow the voltage raise too much and that causes problems. In your case missing cap (~0pF) was a problem. Well, nothing is stopping you from testing a bigger cap the. 510pF, or just add another 270 or so at the back of the existing one for testing purposes and see what …

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Re: 286 TwinHead TH4100 no post - I am stuck

Posted on 2023-08-09, 19:33

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That cap is there only to somewhat debounce the switch, not critical - and while it will also affect POWER GOOD signal, the time constant of 270 pF and 470 Ohm is about 127 ns if my napkin math is corrrect. That should not matter for POWER GOOD if the chipset was designed correctly and it has …

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Re: 286 TwinHead TH4100 no post - I am stuck

Posted on 2023-08-09, 17:44

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok I think the theory it in this https://en.m.wikipedia.org/wiki/Power-on_reset It looks like either the timing or the shape of the signal is somehow screwed up. It would explain why the behavior is slightly different with the two different PSUs..(but both known good)

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Re: 286 TwinHead TH4100 no post - I am stuck

Posted on 2023-08-09, 15:23

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Basically the button is connected like that Check again because I'm pretty sure that diode should be connected backwards. You might want to try and replace this diode, assuming it's a standard silicon like 1N4148, with something Schottky. Reason being it'll have lower voltage drop and drive the …

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Re: 286 TwinHead TH4100 no post - I am stuck

Posted on 2023-08-09, 14:53

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW How much critical is the value of that capacitor? The original seems to be OK and has exactly 270pF. Now there is a replacement - it was a blind shot a bit. The replacement reads 300 (330 but it has some tolerance). It seems to be no change..

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Re: 286 TwinHead TH4100 no post - I am stuck

Posted on 2023-08-09, 14:50

by

by H.W.Necromancer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Basically the button is connected like that Check again because I'm pretty sure that diode should be connected backwards. You might want to try and replace this diode, assuming it's a standard silicon like 1N4148, with something Schottky. Reason being it'll have lower voltage drop and drive the …

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