Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-17, 03:01

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Of 4, 3 are 1N4148. Need id of this diode, the white one: Edit: from another source I found the same diode with markings on. It appears to be a germanium diode, 1N34A. It looks okay (see pic).

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Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-16, 20:54

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

or for the price of chemicals you could buy brand new [1pcs] VL82C331-FC Bus Controller QFP160 US $8.15 from Poland. Too easy. Won't fit. LOL My point is to learn from this. And I already have the stuff, no expenses. Are you sure it still works the VLSI? Internally I hope so, I couldn't test it as …

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Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-16, 14:01

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

After job pics. Old older was rotten to the core and wasn't easy to remove. I even saw a few small 0.45 like solder balls float around, like if the initial solder job at the factory wasn't that successful. Next is to desolder the diodes and maybe replace those as well. Ferrite beads are ok. Quick …

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Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-15, 13:47

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

While I was putting solder mask I came across a few more issues, the LM358 and some caps + res came off. At a glance they look soldered and poking doesn't make them come off. Handling the board I hit some and then they came off clean ripping the contacts, and on those tiny 1206 it's simply …

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Re: Unmarked socket 370 motherboard

Posted on 2023-09-15, 12:09

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

While that Fortemedia soundchip isn't really what I'd call quality, Shuttle's AT implementation of 370 is far better than most PCChips mainboards. I wonder if the HOT-685 doesn't support Coppermines with some modding. That was from my experience with 3 Shuttle boards, they all sucked on capacitors' …

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Re: Unmarked socket 370 motherboard

Posted on 2023-09-15, 11:19

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What I'd check would be the caps. Those are 20+ years old caps. Nope, that's 20+ years of LOW QUALITY caps... nuance there not negligeable :) This is PCChips level, good it didn't blow in his face straight off. While that Fortemedia soundchip isn't really what I'd call quality, Shuttle's AT …

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Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-15, 02:53

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wires solder masked, anchored and let(s hope it'll work.

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Re: Unmarked socket 370 motherboard

Posted on 2023-09-14, 22:25

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PcBytes wrote on 2023-09-14, 22:03: What I'd check would be the caps. Those are 20+ years old caps. Nope, that's 20+ years of LOW QUALITY caps... nuance there not negligeable 😀 This is PCChips level, good it didn't blow in his face straight off.

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Re: Unmarked socket 370 motherboard

Posted on 2023-09-14, 01:23

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My take would be that one RAM slot has issues, and when you use the other then you get as far as an issue with the video card. So I'd leave it in the slot where you get one long and three short, then try a PCI video card. From ram to video, that's progress! :) Yes, PCI card if he has one. I think …

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Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-14, 01:15

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I rebuilt traces/pads. Now I need to anchor them. Some with solder mask others probably epoxy. IDK

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Re: Found in my spare parts box: AMD Slot A K7 1000 - AMD-K7100MNR53B A

Posted on 2023-09-13, 15:53

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, I saw that it was the first 1ghz, and fastest slot a, but I figured maybe like 50/75 bucks, some higher than the 600 and 700 for example. And is it completed as in sold? Or just ended? Don't listen to him! Your CPU is (maybe) worth $20! And me, being a good samaritan, I'm willing to buy it …

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Re: Unmarked socket 370 motherboard

Posted on 2023-09-13, 15:42

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

https://theretroweb.com/motherboards/s/shuttle-hot-685 It should be sporting an Intel chipset if the silkscreen is correct (440BX) Model on yours is 685V12A, probably not relevant but it's close enough. Beeps should be ram related, reseat ram stick if no go clean with some deoxit (contact cleaner) …

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Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-13, 02:28

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

rasz_pl wrote on 2023-09-13, 02:15: or for the price of chemicals you could buy brand new [1pcs] VL82C331-FC Bus Controller QFP160 US $8.15 from Poland. Too easy. Won't fit. 🤣 My point is to learn from this. And I already have the stuff, no expenses.

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Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-13, 01:52

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've had luck removing pin oxidization with Silvo (liquid silver polish) and in some odd cases Brasso (same deal but made for brass). Might be worth a go? This is an idea. Ok, pads on m/b was easy, fiberglass pen and it was fast. The chipset actually has a sh*tload of oxide on the legs, the …

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Re: ABC COMPUTER COMPANY, LTD. A3286 / A3886-01 V3.0 - repair thread

Posted on 2023-09-13, 01:19

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

New stuff. Desoldered the chipset IC. Pin 105 looks not connected, but datasheet has a function for it: https://4donline.ihs.com/images/VipMasterIC/I … EF6B88F2AEB20B8 Does anyone know what's it for? Is it correct to be not connected?

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Re: Boxes to store RAM modules

Posted on 2023-09-12, 21:12

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Shoes box and zip bags (tested and untested). Plastic box + antistatic bags with the ones I actually use for my builds (tested).

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Re: DataExpert EXP4045 - no post, no beep

Posted on 2023-09-12, 18:51

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

tsalat wrote on 2023-09-12, 18:05: best regards, tomas I'd like to remind you that some projects of youtubers took months to solve. So don't think that if you didn't repair it in 2 days it's impossible. Stay positive!!

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Re: DataExpert EXP4045 - no post, no beep

Posted on 2023-09-12, 17:50

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BIOS chip shows corrosion on legs, remove, clean legs, clean socket, check traces, put back and test. U15 and 19 don't look good either. On the back it isn't that good, between the black standoffs I'd check evrything, and clean, scrape, test for continuity... Close to the bottom a trace coming from …

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Re: GA-586DX USB pinout scheme

Posted on 2023-09-10, 20:11

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

DerBaum wrote on 2023-09-10, 18:58: From the manual and the unpopulated header i came up with the same pinout as Nexxen. IMG_5257.jpeg But you made it Italy's flag 😀 Nice touch 😉

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Re: Ha-586DX USB pinout scheme

Posted on 2023-09-10, 13:16

by

by Nexxen

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you for the replies! Actually I am not sure about the pinout suggested and orientation at all, sorry! How can you tell they are inverted? I do not see numbers on the board. Of course the pin are present, I have not soldered anything, but in my past search for help Jan S. shared a bios with …

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