Re: Brand new looking 486 mobo won't start the PSU

Posted on 2019-12-11, 14:38

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would certainly be great if just caps were shorted. It's easy to replace them in the end. Hopefully it's not a problem with some if the ICs because then the board would probably be doomed. I will let you know if replacing caps helped or not, at least to have some kind of conclusion to this thread …

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Re: Brand new looking 486 mobo won't start the PSU

Posted on 2019-12-10, 06:31

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, thanks for the advice. I'll see what I can do with it. Would be nice if I could breath a new life into it.

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Re: Brand new looking 486 mobo won't start the PSU

Posted on 2019-12-09, 19:34

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here's the picture of the motherboard: http://i.imgur.com/oAxOg65t.jpg There was a Dallas battery but fortunately for me it was socketed so removing it was a breeze. These are the measured resistances in Ohms: +5V (Power On) - cannot be measured, no value +5V - 1510 -5V - 14 +12V - cannot be …

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Brand new looking 486 mobo won't start the PSU

Posted on 2019-12-09, 07:38

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have bought a Highscreen 486 DX4 computer which was listed as defective. In the end it was only the motherboard which didn't work, but it's weird. Normally when I encounter defective motherboard, everything starts but the mobo won't POST. With this one not even the PSU will start, I just hear fain …

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Re: Forced mono on Sound Blaster Pro and SB32

Posted on 2019-12-05, 20:53

by

by Paar

in Marvin \ Sound

in Marvin \ Sound

I've tried the method from the link on the Sound Blaster Pro 2 and it's working now like charm. I love VOGONS community!

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Forced mono on Sound Blaster Pro and SB32

Posted on 2019-12-05, 09:31

by

by Paar

in Marvin \ Sound

in Marvin \ Sound

I've been testing some ISA sound cards I have bought over time and encountered weird problem with two of them - Sound Blaster Pro 2 (CT1600) and Sound Blater 32 (CT3620). Both work well, apart from the fact they produce sound only in left channel. I've tried to clean the SPK OUT connectors with IPA …

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Re: Voodoo 3 "baking"?

Posted on 2019-12-03, 14:38

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This could very well be memory problem, even though in my experience with bad memory you see artefacts in one constant place. As I have destroyed two V3s in an attempt to fix them, I have to warn you they are rather fragile. I would try to fix them only with enough experience and proper equipment. …

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Re: What does it mean when Voodoo 2 displays weird colors?

Posted on 2019-12-02, 11:30

by

by Paar

in Marvin \ Video

in Marvin \ Video

When one cranks up the gamma in the 3dfx control panel, the brights would overflow and go into the dark colors as seen in those photos So purple and turquoise colors are common? I ask because you've mentioned dark colors... I guess both purple and turquoise are dark in comparison to white, I just …

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Re: What does it mean when Voodoo 2 displays weird colors?

Posted on 2019-12-01, 16:25

by

by Paar

in Marvin \ Video

in Marvin \ Video

Could you please elaborate on that? Or give me some links with the info? I have hard time finding anything relevant to that...

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What does it mean when Voodoo 2 displays weird colors?

Posted on 2019-12-01, 12:31

by

by Paar

in Marvin \ Video

in Marvin \ Video

I have encountered this offer of Voodoo 2 card. https://aukro.cz/3dfx-voodoo-2-12mb-i-s-kabel … kcni-6958434372 It seemingly works fine but colors are weird. Is that something that could be repaired?

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Re: Have I fried my Asus P3B-F?

Posted on 2019-12-01, 12:25

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Fingers crossed... I have ordered new chip so we'll see how to board will behave when the chip is replaced. Thank you for your help, I would be doomed without you.

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Re: Have I fried my Asus P3B-F?

Posted on 2019-12-01, 11:48

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have removed all caps on +5V rail and the resistance didn't change. After that while I was in the process proceeded with complete decapping. Still no change. After that I thought that the W83977EF chip gets hot and sits on +5V rail... So I have removed it with hot air station and finally got some …

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Re: Have I fried my Asus P3B-F?

Posted on 2019-11-30, 18:31

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you for the tips. I could try to do complete recap once I'm at it as I have no way to know which caps are on the +5V rail. Could replace all +5V regulators as well.

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Re: Have I fried my Asus P3B-F?

Posted on 2019-11-30, 11:40

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have checked LDOs and MOSFETSs for shiny spots but coudln't see anything. None of capacitors are hot, only the Super I/O chip. Resistances (measured with multimeter set to various settings): +3.3V (orange) - 14.4 (200k) +5V (red) - 132 (200) +12V (yellow) - 39.9 (2000k) -12V (blue) -83.5 (2000k) + …

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Re: Have I fried my Asus P3B-F?

Posted on 2019-11-30, 09:17

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have checked the voltage going into the W83977EF and it's exactly 5.0V as specified by manufacturer (Asus is good at this). Even with that the chip is hot like chilli pepper. I have checked the data sheet of the chip and it's frequency is dependant on external clock. There are two crystal …

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Have I fried my Asus P3B-F?

Posted on 2019-11-29, 20:45

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi. I have been testing some AGP cards Ihave bought over time and when tried to boot the PC with Radeon 9200 128MB, the mobo's LED started to blink like crazy after a while of screen being black. Then I tried another card that was working before and the PC wouldn't POST. I have noticed that ISA …

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Re: The neverending journey to elusive Pentium 4 build

Posted on 2019-10-08, 18:32

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow, so many reactions, where to start... Well, it is the only place I could find that had it... so I guess if very specific CPU model/stepping is required it might be worth it. I think I have seen that page but didn't want to pay 55 bucks if 651 costs like 10 or 15. But sadly this is the only place …

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Re: The neverending journey to elusive Pentium 4 build

Posted on 2019-10-08, 10:50

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the question. I am focusing on Intel CPUs only as there are cases when there is better variant from other manufacturer (e.g. the best Intel 486 is DX4 with 16kB cache while there are faster alternatives from AMD or Cyrix). From 386 to Pentium III, the best is obvious - the most performant …

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Re: The neverending journey to elusive Pentium 4 build

Posted on 2019-10-08, 05:18

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, Prescott seems fine performance-wise but still the lowest TDP is 84W if you can find the right stepping, otherwise 115W. In comparison, the D0 stepping of Cedar Mill runs at 65W and that's a quite difference. For me, the best CPU is not always the most powerful. It has to have a good …

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The neverending journey to elusive Pentium 4 build

Posted on 2019-10-07, 19:14

by

by Paar

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've been seriously into old computers for about a half year now and by that time collected some nice hardware. At one point I have decided that my ultimate project will be to build several PCs around the best Intel CPUs - from 386 to Pentium 4. I have obtained 386 DX33, 486 DX4 EW, Pentium 233 MMX …

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