Can someone help me with this SMD resistor? On mine mainboard is broken or missing i need to know what resistor i need to put here...

ty

Acidmonkey wrote on 2026-02-28, 15:29:

How you put voltage to lower then 2.5v? For this AMD cpu i need 2.0 or max 2.1v no??

Right. The little linear regulators on this board will not be adequate to power the later AMD CPUs. I would suggest one of the aftermarket voltage converters or DIY VRM projects. There are many threads here about doing this. For example:

www.vogons.org/viewtopic.php?t=86611

I think that component is a bypass capacitor (for that nearby IC). Note the "BC1" label. It is probably not required, but you can replace it with nearly any similar cap from a scrap board.

nickles rust wrote on 2026-02-28, 16:14:

Right. The little linear regulators on this board will not be adequate to power the later AMD CPUs. I would suggest one of the […]
Show full quote

Acidmonkey wrote on 2026-02-28, 15:29:

How you put voltage to lower then 2.5v? For this AMD cpu i need 2.0 or max 2.1v no??

Right. The little linear regulators on this board will not be adequate to power the later AMD CPUs. I would suggest one of the aftermarket voltage converters or DIY VRM projects. There are many threads here about doing this. For example:

www.vogons.org/viewtopic.php?t=86611

I think that component is a bypass capacitor (for that nearby IC). Note the "BC1" label. It is probably not required, but you can replace it with nearly any similar cap from a scrap board.

Ty for answer. MB is working i was just wondering is this component is affecting MB for working properly.
I just found this cpu so its two voltage on it...

nickles rust wrote on 2026-02-28, 16:14:

Right. The little linear regulators on this board will not be adequate to power the later AMD CPUs. I would suggest one of the […]
Show full quote

Acidmonkey wrote on 2026-02-28, 15:29:

How you put voltage to lower then 2.5v? For this AMD cpu i need 2.0 or max 2.1v no??

Right. The little linear regulators on this board will not be adequate to power the later AMD CPUs. I would suggest one of the aftermarket voltage converters or DIY VRM projects. There are many threads here about doing this. For example:

www.vogons.org/viewtopic.php?t=86611

I think that component is a bypass capacitor (for that nearby IC). Note the "BC1" label. It is probably not required, but you can replace it with nearly any similar cap from a scrap board.

i just check and i have 4.3v only on pin 40 close to this missing smd. And on datasheet say that shoud be 5v. So probably i need to put this smd....

Acidmonkey wrote on 2026-02-28, 16:33:

nickles rust wrote on 2026-02-28, 16:14:

Right. The little linear regulators on this board will not be adequate to power the later AMD CPUs. I would suggest one of the […]
Show full quote

Acidmonkey wrote on 2026-02-28, 15:29:

How you put voltage to lower then 2.5v? For this AMD cpu i need 2.0 or max 2.1v no??

Right. The little linear regulators on this board will not be adequate to power the later AMD CPUs. I would suggest one of the aftermarket voltage converters or DIY VRM projects. There are many threads here about doing this. For example:

www.vogons.org/viewtopic.php?t=86611

I think that component is a bypass capacitor (for that nearby IC). Note the "BC1" label. It is probably not required, but you can replace it with nearly any similar cap from a scrap board.

i just check and i have 4.3v only on pin 40 close to this missing smd. And on datasheet say that shoud be 5v. So probably i need to put this smd....

At this point you should probably start a new dedicated thread.
More visibility and more help.
You will be able to ask more questions and post more pics 😀 + I'm interested in the developments.

New is "more" 😀

I install this bios and now i dont see anymore my HDD. Get stuck on detecting IDE Primary Master.. F4 also dont work ctrl-alt-del yes and also del y can go instide in bios but hdd dont want to detect....before flash hdd was working normaly

Acidmonkey wrote on 2026-02-28, 18:27:

I install this bios and now i dont see anymore my HDD. Get stuck on detecting IDE Primary Master.. F4 also dont work ctrl-alt-del yes and also del y can go instide in bios but hdd dont want to detect....before flash hdd was working normaly

Hi Acidmonkey,

Welcome to Vogons.

This 12/07/1998S BIOS you flashed is limited to 32GB HDDs. Are you using a larger drive? This would explain the hang at detecting the drive.

I don’t know which BIOS you used before, but the only M520/M530 BIOS with 128GiB/137GB support I know is the M520_J2 BIOS, patched by me. 😉
At https://theretroweb.com/motherboards/s/pcchips-m520 it is the 10th BIOS in the list with the Note “Modded by Jan Steunebrink”.

I hope you can still boot from floppy and are able to re-flash the BIOS. Or use a bootdisk of 32GB or smaller.

Greetings, Jan

I got another one of these boards. It's a rev 1.6a (vs 1.6b) and the clock generator only goes to 67MHz. This limits the CPU to 400MHz, but with the lower speed I was able to reduce the voltage to 1.25v and a smaller passive heatsink works fine. I think it may have used the other BIOS version. The M520 BIOS for the K6 does work, but I get a 'unknown flash type' warning at every boot. As with the other board, an 80GB spinning disk works fine but the 128GB SSD does not. It also does not boot from the SATA controller card, but I can boot a CD to load grub, then load grub from from the SATA, then boot.