Atx Motherboard Diagram

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Pierpont Oldham

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Aug 3, 2024, 4:29:33 PM8/3/24

to ozapapef

This motherboard diagram is typical of boards today. Use the computer motherboard diagram to familiarize yourself with motherboard components, terms and locations. You'll find that the visual motherboard layout or diagram will help you to replace motherboard; to do motherboard upgrades; and/or to build your own computer.

Once you know what you are looking at, you can recognize the components on any motherboard layout. A computer motherboard diagram is very useful for when you need to replace motherboard, do motherboard upgrades, troubleshoot motherboard, or build your own computer.

I am looking for a system diagram or something that identifies the chip\fan assembly on the Alienware Aurora R4 motherboard. It is the fan below circled in red, it has stopped spinning and now just seems to tick from left to right. Need to replace does anyone know what this is, or know if it can be replaced?

If a new heatsink base is used, be sure it has thermal grease / thermal paste underneath it (pre-applied from factory, or buy & apply it yourself if it's bare) before u install it (Arctic Silver 5 minimum)

Also, if you remove and check out the bottom of the fan, you should often be able to find a model number or at least some specs. Might help narrow down the search just a little so you can find them online. Example:

Thanks to everyone that replied I will see if I can remove the fan and measure the three points and see if I can get an aftermarket replacement. I will let this forum know if I manage to get the system back up and running or if it is not coming back.

Yes, the fan is clean, with no dust that I can see. But I have not yet removed it from the heat sink, so there could be dust under it, but it moves when blown. It just ticks when powered, left and right at two-second intervals. I have been looking at the after-market solutions, problem is that they are all too tall, so still looking. The video card is right above the fan and heat sink. I only noticed that this fan was not working as I am trying to replace the other fan that sits on the heat sink above the processor, as I am getting system fan failures when testing. I can't find a replacement the same size 50mm x 10 mm with 3 pins for sale in the UK. I have one on its way from China

Once I have replaced the CPU fan. If I can't get a replacement for the little fan on the heat sink. I will try the system to see if it does indeed need it or not. AS it is still cheaper than a replacement reconditioned motherboard

Hello all. Ran a search for this but nothing came up for my specific model. As a 30 plus year user of computers I am very disappointed with the documentation that came with my new rig. I just bought a refurbished HP Pavilion 5000-277c. Opened it up to look around (I have future plans on upgrading the PSU, video and adding another hard drive). Unfortunately, I guess with that 30 plus years, I have also aged and can no longer really see the writing on the MB. I was wondering if anyone had information on where to go to get a mother board diagram like the old Dell or even the Packard Bell computers came with back in the day. I'm curious to the extra ports and the pin settings.

Second, like I said, I popped open the case as soon as I got it and I was impressed with the space available inside. I mean,, this thing is an absolute cavern and the wiring is a beauty to behold. I'm used to the rats nest of cables all over the place but this one has a minimal set of wires and they are routed along the chasis to allow unobstructed air flow. The problem I have is the HDD is mounted on an aluminum plate mounted on the side of the chasis. There is only 1 HDD present and as I usually do with new computers, I wanted to add a second hard drive. I do not see any other bays for a HDD. I was wondering if there is a rail set that would connect the second hard drive to piggyback it on the original, similar to the old Dell computers. This is very important to me as 1gb of HDD space simply wont cut it. I'm considering adding an SSD drive and that would also need some way to mount in the case. An external HDD is not an option as I already have 4 inside a NAS. I want more HDD space inside the computer as I dont always power on the NAS.

Next question is - PSU. Can someone name a specific PSU in the 600 - 650W range. Its for the future gaming upgrade. Any PSU MUST have all of the current power connectors plus an extra or 2 for the discrete graphics card

And lastly - can someone name a discrete video card that will be compatible with this rig. I'm interested in gaming but I'm not hard core so I dont need a 300$ or higher card. Something that could play todays games at mid to high detail levels with acceptable frame rates and no more than 200 bones. I should also have HDMI out.

Your PC is only provisioned for one hard drive. I have seen some posts out here where the posters have fabricated some sheet metal brackets so that one hard drive could be added. I don't have the url offhand.If you don't like to fabricate sheet metal brackets then another option might be to remove the optical drive and mount the SSD using 5.25" to 2.5" adapter brackets in that bay. An external optical drive is fairly inexpensive. Another option is to consider one of the newer hybrid hard drives with a built in SSD cache.

I am trying to understand computer architecture. In particular:- Physical view i.e. what all is packed inside the motherboard and what all outside- Conceptual view. how processor,memory,peripherals are connected.

I am getting confused among various buses like local bus,PCI bus, SCSI bus,ISA bus,USB bus.I am looking for block diagrams. How is the USB port connected to processor ultimately? through PCI bus etc? Why do we have so many buses? What was it like before SCSI/IDE came?

If disks connected through SCSI interface are anyway in turn go to PCI bus, then speed would be limited by PCI bus then why not connect these disks directly to PCI bus. Why is SCSI bus needed in the first place?

That above is a nice pic. From the P4 days, so a bit old, but simple and clear. I have included a more modern one too but this one helps understand the basic structure a bit more since there's less on it, and it's good to have a few pics, and you rightly wanted a few.

To answer your questions"I am getting confused among various buses like local bus,PCI bus, SCSI bus,ISA bus,USB bus. I am looking for block diagrams. How is the USB port connected to processor ultimately? through PCI bus etc? Why do we have so many buses? What was it like before SCSI/IDE came?..." "vaughn diagram It shows no connection between PCI bus and SCSI bus. Is that correct?".. "If disks connected through SCSI interface are anyway in turn go to PCI bus, then speed would be limited by PCI bus then why not connect these disks directly to PCI bus. Why is SCSI bus needed in the first place?"

ISA is way too old, not on this pic(And this is an old pic P4 is old). ISA was replaced by PCI long long ago. Even 15 years ago ISA was probably going out.. it has been finished for years.. you won't see it now.

Chipset designs do vary, so it's worth looking for a few diagrams and trying to see if there are similarities. But I think you may find that anything with a northbridge and southbridge follows that pattern.

The following is based on something that superuser user 'Shivendra' wished to mention - Northbridge is a faster chip, than the southbridge, and is an intermediary connecting faster components - RAM, AGP(though AGP is old now), and PCIe, to the CPU. The Southbridge has LAN, USB, PCI(though PCI is old now).link link link

And in fact, that design with northbridge and southbridge was called the Intel Hub Architecture, but was phased out. I'm no expert, but it was replaced with a new design that instead of the 2 chips - northbridge and southbridge, had integrated much northbridge functionality into the CPU, and besides the CPU, has just one chip, the PCH which has some functionality of what was the northbridge, and functionality of what was the southbridge. In that more modern architecture, RAM connects directly with the CPU. (directly - no intermediary), so, instead of to the northbridge that it had before. The modern architecture has a memory controller built into the CPU.

Thanks but on Page 62 , it is just a component diagram. it is not a schematic. I am looking for a service level diagram to help me find out the fault on the motherboard. Most companies do provide such schematic.

They can suffer from battery damage. I am particularly interested in the keyboard connector to 8042 keyboard controller wiring and also the battery backup circuitry. The mistaken purchase is badly damaged in this area.

Somewhere I have the original Intel 8042 datasheet and the Holtek HT6542B replacement for i8042. Think they have sample circuit diagrams which could be useful...
will attach when I find them in my archives... ohh the Holtek was easy, think the Intel is in a Data book...

Just FYI, I am working on a separate project where I have interfaced a 8042 (marked AMIBIOS) to an Arduino Nano. Consequently I have downloaded all the information on the 8042 and clones that I can find, so I recognise the PDF which you linked. I have already posted in an 8042 thread and will post again later, so please read and add any knowledge if you have it!

Schematics of a full 486 motherboard, any would be helpful as an example, would confirm the wiring of the 8042 to the keyboard socket and also the battery backup circuit. The seller hacked three wires to fix the broken wires associated with the keyboard, but the battery backup circuitry has damage which I am guessing (will try later today) will prevent the CMOS (which I think is in the Ali chipset) being powered. If so this will be a PITA (until repaired) as the CMOS will not remember settings after power-off. I meant to buy a different 486 board from the same seller at the same price, but had multiple tabs open and selected the wrong one ?