If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
PSU's pin looked burnt
Hello
The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. |
Ads |
#2
|
|||
|
|||
PSU's pin looked burnt
ML wrote:
Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. Which connector of the psu looks burnt? There are a few things you can try if the connector that's burnt isn't connecting directly to the motherboard. If the connector that's burnt is the 4 pin connector with 2 yellow and 2 black wires then chances are that the motherboard is fried. -- Mark Mckee CompTIA A+ Certified www.comptie.org |
#3
|
|||
|
|||
PSU's pin looked burnt
ML wrote:
Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. Which connector of the psu looks burnt? There are a few things you can try if the connector that's burnt isn't connecting directly to the motherboard. If the connector that's burnt is the 4 pin connector with 2 yellow and 2 black wires then chances are that the motherboard is fried. -- Mark Mckee CompTIA A+ Certified www.comptie.org |
#4
|
|||
|
|||
PSU's pin looked burnt
There are 4 pin connectors that connect to
the motherboard, some video cards and also hard drives and some cooling fans. Could you be more specific as to which connector and the color of the wires to the burnt pins. -- JS http://www.pagestart.com "ML" wrote in message ... Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. |
#5
|
|||
|
|||
PSU's pin looked burnt
There are 4 pin connectors that connect to
the motherboard, some video cards and also hard drives and some cooling fans. Could you be more specific as to which connector and the color of the wires to the burnt pins. -- JS http://www.pagestart.com "ML" wrote in message ... Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. |
#6
|
|||
|
|||
PSU's pin looked burnt
ML wrote:
Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. The square connector, with two yellow wires and two black wires, powers the processor. The processor does not use the power directly. There is the "Vcore switching power converter" which is located near the processor socket, which converts the 12V from the two yellow wires, into 1.5V or less for the processor. (Picture of some of the components involved in Vcore power conversion.) http://img365.imageshack.us/img365/6...yv266b1fj3.jpg If the capacitors fail, the tops bulge and leak. That is shown here. The tops of each cylinder should be flat. The reason there are stamped lines in the top of the cylinder, is for pressure release. In this case, the pressure built up, until the stamped lines split. Relieving the pressure before it becomes too great, prevents accidents. Sometimes the leakage is brown or orange in color. These are failed caps. http://img395.imageshack.us/img395/5...ploded1hx9.jpg If a cap fails, it can cause collateral damage. If bad enough, it might even short the 12V feeding that circuit. That in turn, would burn the pins on the 2x2 square connector. The pins are rated at about 8 amps or so. To burn the pins, you'd need to draw more than 16 amps at 12V (since there are two pins on the yellow wires, and each takes up to 8 amps). Connectors are rated according to power handling, and 8 amps is about the limit for a Mini-Fit Jr connector of that type and size. (The limit on the main connector is 6 amps, due to so many hot pins being next to one another.) To burn them, probably takes more current than that. (50% to 100% more perhaps, to burn them nicely.) So start by visually examining the components in Vcore. It could be a leaking cylinder, a burned toroid, a burned three tab MOSFET, and so on. Those could all be signs that the motherboard needs repair or replacement. Since your PC was previously working, it probably isn't a mis-wired power supply. Since the system was working at one time, that isn't likely to be the root cause of the problem in this case. Some modular power supplies (where the cable assemblies unplug), can have the wire assembly plugged in, rotated 180 degrees. And that is a possible cause of reversed power as well. It took the modular power supply designers a few generations of design, to "buy a clue" about the importance of keying. Reversing the wires, can cause a lot of power to flow, and will ruin the Vcore circuit. If your system used an Intel D 805 overclocked to 4GHz, that would be another reason for the pins to burn. If that was your hardware configuration, you would have mentioned that by now :-) Systems with that hardware and level of overclock, draw more than 200W from Vcore. Paul |
#7
|
|||
|
|||
PSU's pin looked burnt
ML wrote:
Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. The square connector, with two yellow wires and two black wires, powers the processor. The processor does not use the power directly. There is the "Vcore switching power converter" which is located near the processor socket, which converts the 12V from the two yellow wires, into 1.5V or less for the processor. (Picture of some of the components involved in Vcore power conversion.) http://img365.imageshack.us/img365/6...yv266b1fj3.jpg If the capacitors fail, the tops bulge and leak. That is shown here. The tops of each cylinder should be flat. The reason there are stamped lines in the top of the cylinder, is for pressure release. In this case, the pressure built up, until the stamped lines split. Relieving the pressure before it becomes too great, prevents accidents. Sometimes the leakage is brown or orange in color. These are failed caps. http://img395.imageshack.us/img395/5...ploded1hx9.jpg If a cap fails, it can cause collateral damage. If bad enough, it might even short the 12V feeding that circuit. That in turn, would burn the pins on the 2x2 square connector. The pins are rated at about 8 amps or so. To burn the pins, you'd need to draw more than 16 amps at 12V (since there are two pins on the yellow wires, and each takes up to 8 amps). Connectors are rated according to power handling, and 8 amps is about the limit for a Mini-Fit Jr connector of that type and size. (The limit on the main connector is 6 amps, due to so many hot pins being next to one another.) To burn them, probably takes more current than that. (50% to 100% more perhaps, to burn them nicely.) So start by visually examining the components in Vcore. It could be a leaking cylinder, a burned toroid, a burned three tab MOSFET, and so on. Those could all be signs that the motherboard needs repair or replacement. Since your PC was previously working, it probably isn't a mis-wired power supply. Since the system was working at one time, that isn't likely to be the root cause of the problem in this case. Some modular power supplies (where the cable assemblies unplug), can have the wire assembly plugged in, rotated 180 degrees. And that is a possible cause of reversed power as well. It took the modular power supply designers a few generations of design, to "buy a clue" about the importance of keying. Reversing the wires, can cause a lot of power to flow, and will ruin the Vcore circuit. If your system used an Intel D 805 overclocked to 4GHz, that would be another reason for the pins to burn. If that was your hardware configuration, you would have mentioned that by now :-) Systems with that hardware and level of overclock, draw more than 200W from Vcore. Paul |
#8
|
|||
|
|||
PSU's pin looked burnt
Hello
It's the 4-pins (that sits on one corner on the MOBO): 2 blacks and 2 yellows. The 2 yellows pins, inside the plastic connector looked burnt. Previous condition was that the PSU's fan and CPU's fan were spinning when the main power was switch on but not yet press the switch on the casing. At that time I was looking at the wrong place to solve that problem. I didn't look at the PSU's connectors. Thanks. "Markmckee601" wrote: ML wrote: Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. Which connector of the psu looks burnt? There are a few things you can try if the connector that's burnt isn't connecting directly to the motherboard. If the connector that's burnt is the 4 pin connector with 2 yellow and 2 black wires then chances are that the motherboard is fried. -- Mark Mckee CompTIA A+ Certified www.comptie |
#9
|
|||
|
|||
PSU's pin looked burnt
Hello
It's the 4-pins (that sits on one corner on the MOBO): 2 blacks and 2 yellows. The 2 yellows pins, inside the plastic connector looked burnt. Previous condition was that the PSU's fan and CPU's fan were spinning when the main power was switch on but not yet press the switch on the casing. At that time I was looking at the wrong place to solve that problem. I didn't look at the PSU's connectors. Thanks. "Markmckee601" wrote: ML wrote: Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. Which connector of the psu looks burnt? There are a few things you can try if the connector that's burnt isn't connecting directly to the motherboard. If the connector that's burnt is the 4 pin connector with 2 yellow and 2 black wires then chances are that the motherboard is fried. -- Mark Mckee CompTIA A+ Certified www.comptie |
#10
|
|||
|
|||
PSU's pin looked burnt
Good chance based on your description
that the mobo is fried and possibly the CPU. Pull the motherboard and inspect it (look for discoloration) carefully in the area near the CPU. Also check to see if there is a burnt smell. -- JS http://www.pagestart.com "ML" wrote in message ... Hello It's the 4-pins (that sits on one corner on the MOBO): 2 blacks and 2 yellows. The 2 yellows pins, inside the plastic connector looked burnt. Previous condition was that the PSU's fan and CPU's fan were spinning when the main power was switch on but not yet press the switch on the casing. At that time I was looking at the wrong place to solve that problem. I didn't look at the PSU's connectors. Thanks. "Markmckee601" wrote: ML wrote: Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. Which connector of the psu looks burnt? There are a few things you can try if the connector that's burnt isn't connecting directly to the motherboard. If the connector that's burnt is the 4 pin connector with 2 yellow and 2 black wires then chances are that the motherboard is fried. -- Mark Mckee CompTIA A+ Certified www.comptie |
#11
|
|||
|
|||
PSU's pin looked burnt
Good chance based on your description
that the mobo is fried and possibly the CPU. Pull the motherboard and inspect it (look for discoloration) carefully in the area near the CPU. Also check to see if there is a burnt smell. -- JS http://www.pagestart.com "ML" wrote in message ... Hello It's the 4-pins (that sits on one corner on the MOBO): 2 blacks and 2 yellows. The 2 yellows pins, inside the plastic connector looked burnt. Previous condition was that the PSU's fan and CPU's fan were spinning when the main power was switch on but not yet press the switch on the casing. At that time I was looking at the wrong place to solve that problem. I didn't look at the PSU's connectors. Thanks. "Markmckee601" wrote: ML wrote: Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. Which connector of the psu looks burnt? There are a few things you can try if the connector that's burnt isn't connecting directly to the motherboard. If the connector that's burnt is the 4 pin connector with 2 yellow and 2 black wires then chances are that the motherboard is fried. -- Mark Mckee CompTIA A+ Certified www.comptie |
#12
|
|||
|
|||
PSU's pin looked burnt
"ML" wrote in message ... Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. This works best with a PS/2 keyboard, but sometimes it will work on USB keyboards too. Power down for a few secs... while holding down the delete key, turn the power back on. |
#13
|
|||
|
|||
PSU's pin looked burnt
"ML" wrote in message ... Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. This works best with a PS/2 keyboard, but sometimes it will work on USB keyboards too. Power down for a few secs... while holding down the delete key, turn the power back on. |
#14
|
|||
|
|||
PSU's pin looked burnt
On Thu, 18 Jun 2009 09:30:20 -0700, ML
wrote: Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. You can ask in a pure hardware group somewhere. Your problem has nothing to do with XP (please read the group title). |
#15
|
|||
|
|||
PSU's pin looked burnt
"Mr. Smith" wrote in message ... On Thu, 18 Jun 2009 09:30:20 -0700, ML wrote: Hello The PSU's 4-pins has 2 of the pins looked burnt. I have replaced the PSU but still couldn't get the PC to start. The yellow LED on the MOBO is on when power is switched on. What are the chances that the MOBO is fried? What else can I do? Thank you. You can ask in a pure hardware group somewhere. Your problem has nothing to do with XP (please read the group title). Ignore our resident mental retard. Your question is welcome. |
Thread Tools | |
Display Modes | |
|
|