PC@LIVE wrote on 2026-02-22, 13:02:

Minutemanqvs wrote on 2026-02-21, 16:05:

PC@LIVE wrote on 2026-02-21, 15:33:

Following your instructions 🧭, I checked through datasheet the voltage regulator chip 😬, it seems to be very common in PC P3 and Athlon, well it seems that the initial problem, of failure to start, could be connected in some way to this IC, so the subsequent problem, could be due to the definitive breakage of this IC, or something connected to it.
I tell you that the problem could be another, but in my opinion, it's probably him who broke 😑, looking at the pdf file, I extracted an image, where you can see the individual PINs to what they are connected to, I don't know if you are equipped for removal and verification, that is, you have specific tools, but most are quite easy to verify, using a simple multimeter with diode test or in OHm 🕉.
Also from that image you can understand which PINs to check, clearly if you make suspicious readings, you could be close to identifying the problem.

I will have a look at it tomorrow, I have a hot air gun since 4 days so it's absolutely time to do dangerous things to an innocent PCB! These components seem to be available easily on aliexpress for 2-3€ so it might be worth trying to replace it if I measure something suspicious. I'm doing this mostly for the fun of reviving the board, not that I really need it. And I also have a good coworker/friend equipped for micro-soldering under a microscope if everything goes wrong 😉

Interesting 🧐

Keep me updated on the progress and work you will do, I would like you to be able to fix it, I will cheer for you.

So I finally got a replacement SC1155CSW chip and yesterday I did the exchange on the K7T Pro 2. And...unfortunately no difference, so it wasn't the source of the problem despite it getting very hot. At this point I'm calling it a day, this board will go to the "for parts" bin. Really thanks for your guidance and support until now!

Minutemanqvs wrote on 2026-03-08, 11:06:

PC@LIVE wrote on 2026-02-22, 13:02:

Minutemanqvs wrote on 2026-02-21, 16:05:

I will have a look at it tomorrow, I have a hot air gun since 4 days so it's absolutely time to do dangerous things to an innocent PCB! These components seem to be available easily on aliexpress for 2-3€ so it might be worth trying to replace it if I measure something suspicious. I'm doing this mostly for the fun of reviving the board, not that I really need it. And I also have a good coworker/friend equipped for micro-soldering under a microscope if everything goes wrong 😉

Interesting 🧐

Keep me updated on the progress and work you will do, I would like you to be able to fix it, I will cheer for you.

So I finally got a replacement SC1155CSW chip and yesterday I did the exchange on the K7T Pro 2. And...unfortunately no difference, so it wasn't the source of the problem despite it getting very hot. At this point I'm calling it a day, this board will go to the "for parts" bin. Really thanks for your guidance and support until now!

Hello, well it seemed that there could be some possibility, that by replacing the SC1155CSW chip, it could work again, unfortunately it didn't work, but finding where the fault is, without adequate professional equipment, also requires a lot of luck, so in short it can be done, but only if you have free time.
So in short, using it for spare parts, to fix some other motherboard, could be a good idea, but for some components after removal you should make sure they work, if they don't go you would have found what was broken!
Anyway no problem, I can help you if you have other motherboards with problems, just ask if you need, and thank you for updating me on the progress, lately if you have read the last pages, I too have had cards that no longer work, one day maybe I will understand exactly why!

For the motherboard PCCHIPS BKi810 V3.3A, or equivalent with another brand, with S.370 and Intel i810 chipset, unfortunately will have to wait quite a while, because checking the electrolytic capacitors, I don't have the 1500 uF 6.3V replacement ones, and soon I don't have any orders scheduled, we'll see maybe in a few months, but having suspended the purchase of another old HW, to date I have no reason to buy spare parts.

But anyway I have a more than enough supply of motherboards to repair, I don't know exactly how many there are, and also including those that are working but with small problems, for example the defective L2 cache, I have a lot of work, for a few years, since I do these jobs in my free time.

I even have some motherboards to try, which could be working, some I repaired a while ago, others instead are to be tried and see if they work, probably in the next few days I could start to see if the doubts (if they work?), trying some, in particular I would try a LS S.462, an Acer AM2, and an ASUS 775, if I wanted I would have BTX motherboards, but for these I don't have any case 🏘 suitable, so for the moment I prefer those with traditional form factor (ATX).

Having the chance (time), I could try some of my older PCs, in particular from 286 onwards, just the 286 had a problem with the power supply years ago, which failed, I'll see if I can fix it, the problem I think depends on the electrolytic capacitors, because they are very old, it does not have a linear delivery, but the current oscillates between a normal voltage and a low one, then who knows there could be something else, but it is not possible to replace it, because it has a particular shape (very compact), and the connector is not the same as the P8 - P9 of the AT, I think it is XT type.