Re: How hot should an 8087 FPU be at idle? I'm getting 55-60 deg C... And other 8087 questions

Posted on 2021-02-21, 13:03

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Jed118! Back in '94 I added a 8087 to my XT clone, I think it didn't get to execute at least one instruction - I had no software that would use it, not even a test program or benchmark, so I guess it qualifies at the most pointless upgrade ever. But I remember it running (idling, better said) …

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Re: Pentium on a 386 motherboard ( sort of)

Posted on 2021-02-20, 21:50

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Next step: insert another PGA237 socket between the PODP and the PGA169, connect all appropriate pins to VCC and GND, set bus to 33MHz, enjoy! 😀

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Re: Faulty S3 805 VLB video card

Posted on 2021-02-18, 12:21

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Also check the 14.318MHz crystal while you're at it, and maybe replace the decoupling caps with some of higher quality.

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Re: Motherboard ID and troubleshoot

Posted on 2021-02-15, 00:03

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Glad to report a success, I'm deeply grateful for the assistance! Went straight to the 2.1A bios from UH19, everything works now. This bios presents two options that I don't remember seeing on other SS7 boards: POWER ON Function [Button Only/Keyboard 98/Password/Mouse Left/Mouse Right] KBC input …

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Re: Motherboard ID and troubleshoot

Posted on 2021-02-14, 21:32

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

At first I tried with the few sticks I had at hand, but in the end got my boxes out and tried about a dozen memory configurations (matched EDO and FPM pairs, SDRAM sticks from 32 to 256MB, PC66 to PC133), to no avail. Then, following my hunch about the BIOS, I tried with a Soyo 5EHM image, and it …

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Motherboard ID and troubleshoot

Posted on 2021-02-14, 18:56

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello, Recently got this: MVP3_1.jpg MVP3_2.jpg 9 of 11 main capacitors were bloated, so I replaced all of them with Panasonic FR. There are no means to identify the board, so I hoped the BIOS string would provide some answers. Sadly, the board gets stuck during POST at C3 0C . Tried with 2 CPUs ( …

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Re: Recapping GA-5AX v5.2 with solid capacitors

Posted on 2021-02-13, 14:32

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I kept the original caps from the GA-7VX, they are G-Luxon 330uF/25V and they still measure surprisingly good, around 27-30 mohm. The Panasonic FM of same ratings and 10mm diameter are 38 mohm according to the datasheet. The 7VTXH+ was fitted with Choyo "brand" caps which were bloated so I threw …

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Re: Recapping GA-5AX v5.2 with solid capacitors

Posted on 2021-02-12, 22:53

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't have the 5AX (had a non-working one, gave it away), but if the caps are the same 330uF/25V that Gigabyte loved to use on a few models during late 90s/early 00s, I replaced them on a couple of boards (7VX Slot A & 7VTXH+ Socket A) with Panasonic EEUFM1E331 electrolytics. These are 10mm in …

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Re: Searching for redemption with my LS-486e (need help with MB repair)

Posted on 2021-02-11, 13:00

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

AFAIK EDO/FPM use 5 volts and SDRAM is 3.3V. Check the datasheets of your memory chips and see what they'll take.

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Re: Soltek SL-75FRN2-RL revival attempt

Posted on 2021-02-09, 01:05

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi eebenz , and welcome to the forums! No I haven't connected any LEDs to the board's headers, but I think it's a very good idea as it might provide some clues. Will look into it when I'll revisit the board, which is now stored in the "dead" box along with an equally deceased GA-7VTXH+. I feel that …

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Re: CMA8819A clock-gen datasheet

Posted on 2021-02-06, 15:30

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Surface and marking look kind of rough, maybe it's a 'rebrand' of some other chip?

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Re: Missing chip on this mobo (386 NEAT sx ?)

Posted on 2021-01-31, 12:01

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The PLCC socket is for a 387sx, the two DIP20 sockets next to it could be a problem if they originally housed some PALs, I think identifying the board and finding some other pictures of it (with those 2 chips present) is a must. Edit: Predator99 was faster 😉

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Re: Soltek SL-75FRN2-RL revival attempt

Posted on 2021-01-28, 21:54

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CPU is getting warm, heatsink gets really hot if I unplug the fan. I said earlier that Vcore is spot on, well actually it's about 30mV higher than nominal (tried with 1.5 and 1.6V CPUs). Your reply motivated me to investigate further, so I checked the datasheets of HIP6301 and HIP6302 (the PWM …

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Re: Soltek SL-75FRN2-RL revival attempt

Posted on 2021-01-27, 20:12

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looking good: SL-75FRN2-RL 1.jpg SL-75FRN2-RL 2.jpg But unfortunately, dead as a doornail. No beeps, POST card only shows dashes. Tried multiple CPUs, various RAM sticks or even no RAM at all, hoped for a corrupted BIOS so tried two other versions that I could find on the net, nothing. Vcore is spot …

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Re: Soltek SL-75FRN2-RL revival attempt

Posted on 2021-01-25, 00:35

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I guess green will have to do: SL-75FRN2-RL resocket.jpg Not soldered yet, just laid over the destroyed one, for artistic impression. Desoldering from the donor GA-7VA was much harder than I imagined, i had to use the hot air (on lowest setting) and vacuum desoldering stations simultaneously, …

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Re: Soltek SL-75FRN2-RL revival attempt

Posted on 2021-01-24, 16:41

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, not the first time I got stuff with inductors removed, I'm sure copper scavenging is the reason. Broken socket must be because of heatsink removal without unlatching it. Board isn't warped at all, but solder ball damage isn't out of the question. A short while ago I suffered the first setback …

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Re: Socket 5 motherboard recognizes only one keyboard

Posted on 2021-01-24, 13:23

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, and welcome to the forums! This is just my experience and I'm not ruling out other possible causes. Sometimes a fuse or inductor on the +5V line to the keyboard connector can fail to a high-resistance state. Different keyboards have different current draws, and can be more or less tolerant to …

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Re: Soltek SL-75FRN2-RL revival attempt

Posted on 2021-01-24, 13:06

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The inductors (and the socket) will be transplanted from a dead GA-7N400 Pro2 and hopefully they'll work. VRM stage is quite similar (HIP6602+6301 for the Gigabyte, HIP6602+6302 for the Soltek, difference being due to the number of phases, 3 vs 2). An extremely nice chap that sells a similar board …

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Re: Help find a manual for this Baby AT Socket 7 board (AVB55C REV B2)

Posted on 2021-01-24, 00:59

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Have you checked if the VRMs output the proper (or any) voltage? Also, the BIOS could be corrupted, do you have the means to dump the content of the flash chip?

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Re: Save or recycle hardware.

Posted on 2021-01-24, 00:52

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Congrats! Nice board, with simple and clean design. I'm slowly expanding my collection, but so far all my Sk.A boards are VIA or Nvidia-based. Last two weeks have been Socket A-repair galore for me, saved from their doom boards like Abit KW7, Gigabyte 7VT600 and 7N400SL, two MSI KT4V, Jetway 867ASH, …

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