Looking at other motherboards, from previously purchased lots, I have one LGA 775 of course ASUS, model P5S800-VM REV 1.01, tidy enough, with a CPU already installed, should be a P4 5X0 or 6X0, should be one of the first 775 since it has an AGP slot, instead of PCI-E, but I won't know what CPU is there until it boots (hopefully good 😌), it could also be a Celeron (D probably) or who knows what 😨.

Looking closer, I noticed a capacitor to replace, others to check, plus some wrong connector PINs, which need to be straightened, overall it's a fairly cheap board, but which could be used for simple tasks, or upgraded if the chipset supports dual CPUs or multi-core.

Unfortunately it only has two RAM slots, and this limits the maximum amount that can be installed, I think you can't put more than 2 or 4GB in total.

Today I worked on a couple of motherboards, both are LGA 775, for both I changed some capacitors, we will see in detail which ones.
I start with the ASUS P5S800-VM, as you can guess it is a model with a non-Intel chipset, in theory it should be a disadvantage, in reality the use of this chipset allows the installation of more powerful CPUs, it seems that it is possible install the Pentium D 8XX series (maybe even the 9XX???), but I'll deal with this later, when I've tested the card and it works.
I replaced a capacitor near the SATA port (battery area), after removing it I saw that it had a lower capacity, about 680uF instead of 820uF, I don't know what problems it could create, but I replaced it with an identical one.
The other motherboard is Micro Star, unfortunately the model is not written, it is probably from an Acer PC (?), here in the RAM area there are four capacitors to replace, but I also change the fifth, because even if it looks good, it could be found to be defective (by checking it), the original ones are OST 1000uF 6.3V, do I use Nippon for replacement? from 1000uF 6.3V, which you can see in the picture.

Finished ✔️ the startup tests of one of the two cards, the result was not what I imagined, I tried the ASUS P5S800-VM, I checked the jumpers from the manual and connected both the PCI-ISA Post Card (which I normally use) , pressing the switch unfortunately 😣 nothing happens, i.e. it doesn't start, although the on-board green LED says it's ready to start, I tried to make direct contact (in case there was a faulty switch) and nothing, I'll have to check if the lines are ok 👌, assuming the problem is there, or I'll look if I find something with burn marks (not very visible).

So I decide to try the MSI card, but I do a preventive check, in the meantime I don't know how to connect the boot switch, I have to look if I can find it somewhere, however I zoom in on the back area in correspondence with the ATX1 socket, and here I find that all three scratches have interrupted the thin tracks, I tried to take some pictures, but I can't do better, unfortunately 😣 before attempting to start, they need to be fixed, and for the moment I prefer to do other component replacement jobs (not necessarily capacitors), patience we'll see in the future if maybe 🤔 with some free time ⏱, I can fix them.

As i worked for nothing for now, at least so far i didn't get any resurrected motherboard, i decided to take back the ASROCK P4VM890 and fix it, let's say for the lost SMD 😩 in the back, i recovered something like this (labelled as condenser) in a scrap circuit 😑, with difficulty 😓 I detached and re-soldered it, while for the replacement of the Sanyo 1500uF 16V capacitors, it was not a problem, I changed them with Panasonic 1500uF 16V, of the four removed three are ko and one ☝️ is in good condition, but the new ones are still better, they will probably last even longer, because qualitatively they should be superior.

For the curiosity of the reader (and the viewer), I put the images to work started and finished ✔️.

Tomorrow I should try it, and I hope to be luckier 🍀, and see a BIOS boot screen, and do some benching.

Unfortunately 😣 despite my repair attempts 👨‍🔧, I couldn't get either of the two motherboards to start, I'm referring to the ASUS and ASROCK respectively 775 and 478, unfortunately 😣 even after the battery change 🔋, pressing the PWR- ON nothing happens, a not very encouraging signal, which makes me think 🤨 of a further fault, to be found and solved, assuming that something replaceable is damaged, I will check the lines for both, I think the + could be critical 12V (auxiliary included), and in this regard I'll try another power supply, to exclude an undersizing problem, even if it worked with the P4S800, so it's just a check, just to see if it could cause problems.

Since they don't work, I removed the dissi of both, to see what CPUs they had, the 775 has a 3.0GHz P4 630, while the 478 has a Celeron 2.4/128/400, here if it started, a replacement was urgently needed, from about 3.0GHz, then sure 👌 first I would have done ✔️ some benches, just to understand what performance it had.

So, up to this point, I didn't quite understand why the two motherboards don't start, in one the ASUS P5S800-VM there is a green led, which lights up and which should indicate that the board is ready to start, unfortunately pressing PWRBTN nothing happens, at least visually it is like this, I don't see any attempt of the fan to spin, and since the green led is on, I think it indicates the presence of the +5VSB, I guess that either the circuit of the PWRBTN, fault due for example to a scratch of the tracks, or there is a faulty component somewhere, so if anyone has any idea, where or what to look for, I can only say Thanks in advance.
The other ASROCK P4VM890 board, is visually like new, I was hoping to get it back, because it's a 478 with PCI-E, unfortunately this one also doesn't show any signs of booting, both were interesting to compare, one for 775 CPUs with AGP and DDR 400, the other with 478 PCI-E and DDR 400, in short, without any help I doubt that I will be able to get them going anytime soon.

A little while ago I finished ✔️ the capacitor replacement job, for a while I won't have free time ⏱ to dedicate to the boards, so I finished the job I started some time ago, on an AM2 motherboard, I had removed some swollen capacitors plus some visually ok 👌 , today I removed three more in the area, even if they were very beautiful to see 🤩, of course 🙄 that the replaced ones are of the same value and voltage (even the dimensions are the same ).

The motherboard is a Gigabyte, aesthetically also very pleasant, the model is GA-M55S-S3, it has no integrated video, only audio and LAN, a couple of SATA 🚪 ports are missing and the BIOS chip is single, even if in the PCB there 'is dual BIOS and two more SATA ready.

We'll see if I can try it soon, maybe tomorrow 🤔 no, I should find time ⏱ to assemble the i5 in the 🏘 Acer case, and then there would be the motherboard to change in the Phenom X3 8650, for the latter you have to reinstall Windows 7 , because it fails to start.

More soldering work on the motherboards, I have an ABIT SE6 ready to replace the electrolytic capacitors, I had removed them some time ⏱ ago, both the swollen ones and the visibly fine ones 💺, of course 🙄 I only removed those of that type, leaving the other originals, and hoping they are still ⚓️ in good condition.

In place of the originals (quite poor), I put some Nikicon 1500uF 6.3V, and they are quite similar in size, the soldering job was relatively simple, even if some didn't come out really well 😌, the important thing is that the board after this work, you'll be back up and running, I don't know when but I'll give it a try, adding RAM and CPU (plus a battery 🔋), nothing else is needed, because there's integrated video, as well as audio, even if the latter isn't essential to do a startup test

Of course 🙄 fixing some motherboards, I should try them immediately, unfortunately 😣 it's not possible (except when the repair is done on a board that I use), by doing so, I accumulated various pieces to check, usually before trying to boot them, I do some visual checks, many times I find scratches or missing SMDs on the back, in which case it returns to the box 📦 where I keep the ones to be repaired, even if lately the box 📦 is gone, it had become very large, now I use cardboard boxes, which overlaps.

Lately, I've had no luck 🍀 with boot tests, the P4 cards I've repaired, didn't boot, in fact they gave no sign of life, maybe 🤔 that could be good, because there would be a fault in the power supply circuit (? Boo), but on these we need to check the tensions present, and for the moment I don't have enough time ⏱.

The last motherboard I tried to start, it's a L-I946F from a Lenovo PC, it's not a particular card, it's the usual PC card I use Office - Home, so integrated video and audio, Intel chipset (well better not at all 😇) I don't know what model, and Intel Pentium Dual Core E2180 2.0 GHz CPU. Here, however, unlike the two previous P4s, the PC starts up (well, it's not really like that), that is, it starts up, but stop immediately on the post codes — 00, a sign that there is a problem that blocks it, in short, yet another failure 😣.

Yesterday, I did some tests on the ASUS P5S800-VM, first of all I remember that, when the PWR-ON switch is pressed, the card does nothing, the CPU and power supply fan stays still, and no boot attempt is noticed, a sign that the short circuit protection intervenes, I exclude the CR2032 battery because it is new.
To date, I have seen a voltage of about 3.3V in the PWR-ON cable pin, and this seems correct to me, the next check will be on PIN A14 (if I remember correctly), here too I should find about 3.3V, we will see if it will be like this.
I tried to disconnect the 4-PIN 12V auxiliary connector from the power supply, and start with only the 20-PIN one, this allows me to rule out that the start-up problem is in this section, unfortunately nothing has changed, but it must be said that the CPU fan works with 12V, and that therefore the yellow cable of the 20 PIN had to be disconnected as well, in this way the +12V circuit was isolated, in case the power supply fan turned (The CPU fan didn't!), the problem was on the +12V.
I'll try to make a few more attempts, also to see if there's any bad soldering, I'll try pressing some chips, maybe I could just have a bad contact and no faults.

Among the various motherboards under repair, I have a couple of MSI 754s, both seem to be in excellent condition, but in one there is a capacitor that needs replacing near the ATX 4 PIN connector.
Even if they are the same model, they differ slightly, in one there is integrated VGA, in the other not, however the AGP slot is present in both cards, so the integrated video can be replaced with a normal AGP video card, although it would be desirable to use a better model (than the integrated VGA).
The replacement job should be quite simple, and can be done in a short time, the question remains whether to replace all the others next to it (the same), or just the swollen one?
Once this is done, you need to get a retention module for attaching the CPU heatsink. This board only has two holes, compared to the four normally used.
I have some Semprons left as CPUs, I have used the Athlon 64s on various motherboards, some are on ASROCK K8-Upgrade-NF3, in the future I could use the appropriate board for CPU upgrades (future CPUs), and recover one or two Athlon 64 754.

Unfortunately I have little time to dedicate to repairing the MB, or to checking the repaired ones (if they work), and so I have a certain number of cards waiting, the most difficult cases are those with blown SMDs on the back, or the Intel ones with bent PINs in the socket (LGA), I also have various cards with scratches in the tracks on the back, if they are not many and tiny, it is not difficult to fix them, some instead require tools that I don't have, and I have to postpone any intervention.
Among the cards to try I have a Dell BTX with C2D E6400, it has integrated video and audio, I also have a 305W Dell PC power supply, I have to check if it works, but if it does, you can use a common ATX power supply of around 300W.
Coming soon I have an ABIT IP35, with C2D E4600 CPU, this card does not have integrated video if I remember correctly (audio does), there is the original Intel heatsink, and 6GB of DDR2 RAM (3X2GB), if you want you can add a Two GB RAM, this way you get 8GB total (should be the maximum).
I invite anyone who reads or watches, to participate even just for a brief comment, or for suggestions of any kind, or you can ask for any on other cards, having various PCs in my collection, I can restart them on request, to do tests or try diagnostic programs.
Thank you very much, any ideas or requests are welcome.

Yesterday I was lucky 🍀, I received a batch of CPUs, two 775s and two 115Xs, then a MB arrived complete with everything, ABIT IP35 775 with C2D E4600, 6GB Ram (3X2), original box, and all its contents (maybe even more), but that's not all, I found an Olivetti PC M4 P75S-Modulo, in quite original conditions, apart from the addition of the CD player and a PCI Audio card, of this PC and of ABIT, I'll write soon, I'll do some startup tests, and I hope they both work.

Among the motherboards to test in the next few days, I have two ABITs, one is the IP35 775, with C2D E4600, to which just 😡 add a PCI-E VGA and a disk, to start the tests and launch the benches.
The other is older, it is an S.462, AN7 with Athlon 2800+ Barton, if I remember correctly, however, it requires a BIOS update for the correct recognition of the CPU, the card still starts and works, although in the line there is no 'it is written Athlon 2800+, the frequency is also right (about 2GHz), the only thing is that the CPU is 333, not the maximum for those CPUs (400).
The RAM present is 1GB (if I remember correctly), there are two DDR 500 AData (yes 500, not 400), currently they are installed on the banks of the same color (1-2), but it seems that the one on 1 needs to be moved to 3 , this is the only way dual channel works.
These ABIT cards seem very suitable for any overclocking, in case I will try to raise the FSB a little, but staying on light values, let's say for an FSB 333, I would go up to 350 or at most to 366, honestly I have never tried these frequencies, I don't know if they are high or is there the possibility of even going to 400?

Sorry but for the moment I don't have time to test the cards I previously wrote about, but I will try a PC with MB ABIT KT7A and Athlon XP 2400+, this CPU runs at 2000 MHz with FSB 200 and multi 20X, in reality it should go to 266 and 15X, but being a dated card, the maximum multi is 12.5X, so it doesn't seem possible to reach 15X, but instead it is possible to go up, as demonstrated by the 20X with which it works at FSB 200.
Browsing discussions on this topic, i.e. XP2400+ on KT7A, the only way to obtain a 266 FSB is to select 9X, but this makes the CPU go beyond 2000 MHz, around 2266!
In reality you should select 7X which would be interpreted as 15X, unfortunately it doesn't work unless you make changes, but by selecting 9X you don't need to change anything, you may need to raise the VCORE to have more stability.
I will soon make this attempt, if it succeeds the CPU will be identified as XP 2800+, and above all it will have a 266 FSB, a small improvement but which could be interesting, given that the motherboard is one of the first 462, having PC133 RAM (no DDR !), and there is an ISA slot, useful if you have a quality ISA sound card, I have an SB Live here! PCI, plus a 32MB Matrox G450 DH AGP, and PCI LAN and modem card.

On a PC with MB ABIT KT7A and Athlon XP 2400+, I have the CPU that runs at 2000 MHz (FSB 200 and multi 20X), in reality it should go at 266 and 15X, but the card is dated, the maximum multi can be selected from BIOS is 14X, it seems that it is not possible to reach 15X or more, however it is possible to go up, this is demonstrated by the 20X with which it works at FSB 200.
Browsing discussions on this topic, i.e. XP2400+ on KT7A, the only way to obtain a 266 FSB is to select 9X, but this makes the CPU go beyond 2000 MHz, around 2266!
Just select 9X and 133 MHz, which will be interpreted as 17X, and it works, without any changes.
You may need to raise the VCORE, to have more stability, the standard one is 1.65V, but 1.75V could be sufficient.
As you can see in the images it works, even quite well, of course even if the CPU temperature seems rather normal, I found a block in a test, I think this can be resolved by increasing the VCore to 1.75V, beyond that I don't know if it can create problems, especially temperature problems.

I completed some benches, with an ABIT KT7A and Athlon XP 2400+, first at 2000MHz, however the motherboard does not start at 15X and FSB 133, but self-configures at 20X and FSB 💯 100, for this reason the RAMs should be at equal frequency, and be a little slower, the ones I use are PC133 and CL2, even if I have to lower the value in the BIOS because it is now at 3.
The next step is to raise the multi to 17X and the FSB to 133 (manual settings from BIOS), the frequency rises to 2266MHz and the PR rises more or less to around 3000, this however with standard voltage 1.65V, if it had been necessary I would have made an overvolt of 0.10-0.20V, to give stability to the OS and programs.
I used the usual programs, which I use on every PC, CPU-Z for W98, and Sandra, then SuperPI 1.5, later I will try to use other programs, but these three already give an idea of ​​how the PC is doing.
And at 2266 frequency, it seems to go much better, unfortunately it is a bit limited by the PC133 RAMs (no DDR!), and I don't have similar faster RAMs, like PC150 or PC166, then there would still be some things to optimize, like the CL to be brought to 2, the AGP which is currently 2X, even if the video card can work at 4X, and the ATA I don't know if it goes to 100 or less???

I change motherboard, I switch to an ASUS A7V600-X, on which there was already an AMD Sempron 3000+, FSB 333 multi 12X and 2000 MHz real frequency, in the future I will try to go up from FSB 333 to 400, which correspond to 2400 MHz real, in short, an overclock that is not exactly light, but could give interesting results.
I had not yet installed a VGA AGP, because in the previous tests I had used an 8MB ATI Rage XL PCI, also because I currently use an IDE-CF adapter with DOS and Windows 3.X, I chose from the cards I have, an ASUS GF4MX440 128MB, which I installed and tested.
I also added a PCI Modem card, not because I needed it, but because it comes from the same PC as the GF4MX440, if I were to use the internet, I would use a PCI Wi Fi card.
Next step will be, adding an HD with Windows, I haven't decided which one, but one between 98 and XP, it's very likely.

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The next PC I have to try is a 423 Pentium 4 2000 MHz, with 1 GB 🇬🇧 of RDRAM, a page recently appeared here, inviting Willy CPU owners to publish some benches, some time ago I had run some , but today I could do others, of course I could also review the PC configuration, and if necessary I could change the AGP video card, with a better model, I don't remember exactly which card I have, but I could put something faster on it.
The things I remember are: Gigabyte per MB, integrated audio, and the CPU was initially a 1700, while the RAM was increased from the initial 256 MB, to 512 MB by removing the terminators. By this weekend I plan to restart it, and post some images.