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Need MOBO wiring intructions
Need wiring instructions to connect up a motherboard to a desktop PC.
I was hoping to find same for a generic board. I can't find same for mine. I am doing something wrong. Thank you Sammy |
#3
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Need MOBO wiring intructions
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#4
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Need MOBO wiring intructions
On Fri, 13 Jul 2018 09:04:41 -0500, philo wrote:
On 07/12/2018 04:27 AM, wrote: Need wiring instructions to connect up a motherboard to a desktop PC. I was hoping to find same for a generic board. I can't find same for mine. I am doing something wrong. Thank you Sammy Just go to the website of the mfg and get the diagram. With a good light and magnifying glass though you should be able to read the markings on the board. Most of the time I build a machine all I hook up is the power button.... I could care less about lights and beeps. I feel same Thanks Sammy |
#5
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Need MOBO wiring intructions
On Thu, 12 Jul 2018 20:21:03 -0400, Paul
wrote: wrote: Need wiring instructions to connect up a motherboard to a desktop PC. I was hoping to find same for a generic board. I can't find same for mine. I am doing something wrong. Thank you Sammy The lack of details in your question, aren't going to give you detailed answers. There are four twisted pairs for the front panel. There is a separate pair to run the SPKR beeper. It's not with the other four pairs. On an OEM computer like an HP or Dell, the SPKR is a black circle the size of a quarter on the motherboard, and doesn't need wiring. That's a "built in SPKR". Motherboard FPANEL headers can have from 8 pins to 20 pins. On an HP it might be x x IDE_LED If polarity wrong, rotate and try again x x POWER_LED (You cannot hurt the LED via wire rotation) x x RESET_SWITCH (momentary contact, normally open circuit) x x POWER_SWITCH (momentary contact, normally open circuit) On an Asus motherboard, there are pins missing in the 20 pin pattern, for keying or recognition purposes. Generally +5V and GND pins are separated by enough, to prevent easy shorting by bending pins. There is a modicum of safety in the header. Electrically, the most danger was in some of the SPKR wiring choices. (I have computers here where the plus SPKR wire is wired directly to +5V, which is a bad practice.) ******* On the computer case portion, the wiring harness has a "common color" x x white,red x x white,orange x x white,green x x white,blue The message there, is white is the "minus" or "ground" color. On another machine here, they were a bit more logical, and made it like this for the front wiring harness. Black is the common color in this example, and is the "minus" or "ground". x x black,red x x black,orange x x black,green x x black,blue Retail motherboards have a legend next to the pins, printed in super-tiny white letters. The front panel wiring "floats". The two switches (the RESET and POWER switches), neither of the wires is referenced to the chassis. By doing it that way, you can rotate the wire pair when connecting to the motherboard, without incident. The "white" being minus in that case, is just a convention, and not an electrical necessity. But, we can always pretend the manufacturer was a dope, and they made the white wire touch the chassis too. If you observe the polarity convention, you should be OK. The LEDs are wired to a transistor switch and a power source/sink. The LEDs float on the chassis end. The LEDs have a PIV of 5V, and can safely be reversed electrically without damage. (Note that not every LED you can buy at Mouser, comes with that guarantee!) If the LED doesn't light, you probably didn't connect the "white" wire to the "minus" pin. Here is a sample motherboard document, showing the wiring. Four pairs go to the front panel. The SPKR pair will only exist on things like the Asus motherboard, as the HP or Dell will have a black quarter-sized disc on the motherboard to do the beeping. https://s33.postimg.cc/405akh8y7/front_panel_wiring.gif This information is intended to explain the general scheme. And is not sufficient if all the hardware in question is not labeled properly. Paul Thanks Paul You're on target as usual. Sammy |
#6
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Need MOBO wiring intructions
On 13/07/18 01:21, Paul wrote:
Generally +5V and GND pins are separated by enough, to prevent easy shorting by bending pins. There is a modicum of safety in the header. Electrically, the most danger was in some of the SPKR wiring choices. (I have computers here where the plus SPKR wire is wired directly to +5V, which is a bad practice.) Yup, Ancient memories of connecting up a case shorted speaker to a lowly* 486 motherboard and watching it's spiral wound PVC wires rapidly burning off - a few amps from the PSU must have seen to that. I replaced the speaker, and all worked fine. (*) PC Chips / UMC or some other crap. -- Adrian C |
#7
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Need MOBO wiring intructions
On 07/14/2018 03:21 AM, wrote:
On Fri, 13 Jul 2018 09:04:41 -0500, philo wrote: On 07/12/2018 04:27 AM, wrote: Need wiring instructions to connect up a motherboard to a desktop PC. I was hoping to find same for a generic board. I can't find same for mine. I am doing something wrong. Thank you Sammy Just go to the website of the mfg and get the diagram. With a good light and magnifying glass though you should be able to read the markings on the board. Most of the time I build a machine all I hook up is the power button.... I could care less about lights and beeps. I feel same Thanks Sammy Hope you got it by now. BTW: I have not moved over to solid state drives yet but a friend has and they do help performance quite a bit. |
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