Re: Asus ISA-386C motherboard - blown capacitor values

Posted on 2022-06-21, 22:03

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

They're usually 10uF/16V, but these values are not critical (just don't go any lower with the voltage). Pay attention to polarity when installing them, especially those on the negative rails.

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Re: So, like, does the K6 3+ 550mhz really exist?

Posted on 2022-06-05, 22:48

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Found one in the wild. https://www.ebay.com/itm/394095618233 Laser engraving in the upper-right corner should read "550" but looks like a mess, at least on the ebay photo. I wouldn't be surprised if more and more high speed "K6-3+" pop up for sale as the news of the 2+ mod spread around the globe …

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Re: Intel AA-654850-206 Advanced/ML Marl motherboard lost VRM

Posted on 2022-05-19, 22:08

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a late replica of this board, made by InBus Engineering (aka "the world's largest supplier of retired Intel Motherboards and systems."). The vrm is a LT1585A.

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Re: md-4duv-ver 2.1 Motherboard DX4-100 Unstable - DX2-66 works fine

Posted on 2022-04-21, 22:46

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Since the FSB is the same between the DX2-66 and DX4-100, I doubt the cache is the problem. Also, you said even the 25MHz bus is unstable with the DX4. One thing that differs is the voltage (unless you got a 3-volt DX2), and that's why I'm suspecting the VRM (or something more complex related to the …

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Re: Octek FOX 286 REV 1.2 resurrection

Posted on 2022-04-11, 00:22

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Assuming you're asking about the chips with shiny silver stickers on them. The two smaller ones are the main BIOS, in an interleaved fashion (odd+even bytes). Something about the chips being 8-bit wide and the 286 bus being 16-bit. The other one is the keyboard controller, and although it contains …

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Re: Adding a fan header to Geforce3 TI 200, help with components check needed!

Posted on 2022-04-11, 00:00

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think you're looking for this: gf3fan.png I would try without the parts marked "no stuff" at first (as you mentioned, they are missing on some cards). If you don't have continuity across L202 pads I think you can safely short them. And, since it's been mentioned, fan control was a thing on GF3 - …

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Re: Hello, World! :D - Robert B's PC builds - oogle away freely :)

Posted on 2022-04-09, 23:58

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by quicknick

in Marvin \ System Specs

in Marvin \ System Specs

craig26283 wrote on 2022-04-08, 20:10: No idea what that chip does then. Me neither, but it seems important. I'm puzzled that it works 😀 I'm expecting at least some PCI slots to misbehave. Check page 17 here: Filename 6195100.PDF File size 669.93 KiB Downloads 14 downloads

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Re: Asus P2B-F value of smd resistor R229

Posted on 2022-04-06, 21:53

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On my rev 1.0 board that's a zero ohm resistor, so bridging is safe 😀

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Re: Desoldering help

Posted on 2022-04-03, 22:19

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Also some of the through holes still have solder in them. Does anyone have a good method for opening them up? (Like aside from drilling them , that sounds pretty risky to me :/) My method, used with 100% success so far: Fill the stubborn holes with fresh solder, to create a small "dome" on each …

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Re: Matrox G450 eTV - capacitor problem

Posted on 2022-04-02, 11:42

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Should be 10uF, 16V. These are very common, I keep a stash of them. Panasonic EC series, if I recall correctly.

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Re: SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod

Posted on 2022-02-25, 22:05

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

fsheatsink.jpg Here's how the heatsink was factory-attached to the cpu in a Fujitsu-Siemens computer. I was going to open a thread to ask you guys what type of 'glue' could that be, as I'll be needing to permanently attach a heatsink to some Duron for testing a Socket A board that can't accept a …

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Re: Hello, World! :D - Robert B's PC builds - oogle away freely :)

Posted on 2022-02-25, 21:24

by

by quicknick

in Marvin \ System Specs

in Marvin \ System Specs

Almost sure he's looking for the smaller socketed chip (the one below the BIOS). Which is probably some sort of PLD, so its contents is also needed. Also, unfortunately, if the device is so badly blown, the whole motherboard could be toast.

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Re: Voltage problems after recapping (DFI K6XV+/66)

Posted on 2022-02-22, 22:43

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh, those are special ultra-low-esr caps, even polymers cannot match that :rofl: If the recapped boards are identical, down to the hardware revision # and the vrm controller being used, and assuming nothing bad happened during the recap, maybe the problems could be caused by water still remaining …

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Re: 386sx motherboard - 10beeps, CMOS error - help needed

Posted on 2022-02-22, 22:28

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

At least one of my 386SX boards (Opti 82c291 based) refuses to boot without all 4 simm slots populated. Can't remember what errors it throws, but it's not something memory-related, so this threw me off for quite a while when diagnosing it (dead KBC and heavy corrosion compounded the issues).

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Re: SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod

Posted on 2022-02-21, 19:32

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is epic! I must confess I was among the ones 100% convinced this would be impossible, and wow I'm so glad i was wrong! Hats off to all those involved, especially to Sphere478 for pursuing this and Fritzchens Fritz for providing the crucial evidence and being the first to test it! [edit: typo]

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Re: Help with Octek Fox M 286 (broken chip)

Posted on 2022-02-10, 18:34

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

No luck with the PAL chip so far? I went ahead and recreated PAL equation from datasheet, seems to be working as intended at Proteus simulation. Few days have passed. And another month on top of them. Only today I was able to find time to set up the board and try your JED file, programmed it into a …

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Re: Auxiliary connector on power supplies!

Posted on 2022-02-07, 14:47

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Such annoyance, these connectors. The P4-era ones provide 3.3V and 5V, and I wonder whose great idea was to reuse the ones that were used earlier for 3.3V only, that in turn were reused from even earlier ones that provided 5 volts. I have such an old AT psu that has a third identical connector …

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Re: FID SD11 rev.1.8 - Help with missing caps

Posted on 2022-02-06, 01:06

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

470uF/10V, Teapo SEK series. The ones near the ATX power connector are SH series. Good luck!

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Re: FID SD11 rev.1.8 - Help with missing caps

Posted on 2022-02-02, 21:55

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Both are 220uF/16V. Generic TEAPOs, they don't look low-esr or anything special. Positive goes to the square pads. Same revision, 1.8.

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Re: Samsung S330 XT Clone BIOS

Posted on 2022-01-16, 22:20

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Please post some pictures of your board, with close-ups of the corroded areas. Maybe we'll be able to help. Sorry, my XT board is not for sale. If this should change, I'll let you know.

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