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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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PC Power supply
My son has an E-Machine T3828 that will not power up. Unfortunately he is
around 100 miles away so I do not have more information. There were no changes made to the PC that might have caused this. At first glance it is easy to blame the P/S itself, but a new replacement did not help. A detail: He reports that with either supply there is a single LED on the M/B that lights up. What controls this light? On either P/S there is no other sign of life. No fans turn on. What are the likely causes? I have considered some. The power switch may have failed. Or the mechanical link from the front panel to the switch. IIRC there is a pin on the M/B-P/S connector that provides an input to the supply so that the supply turns on.. Is that a set level? What controls it? I am considering having him drive down with it. I can repair electronic devices, but I have never come across this situation. Is there a likelihood that the fault is in the M/B? Thanks, Charlie |
#2
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PC Power supply
"Charlie Bress" wrote in message ... My son has an E-Machine T3828 that will not power up. Unfortunately he is around 100 miles away so I do not have more information. There were no changes made to the PC that might have caused this. At first glance it is easy to blame the P/S itself, but a new replacement did not help. A detail: He reports that with either supply there is a single LED on the M/B that lights up. What controls this light? On either P/S there is no other sign of life. No fans turn on. What are the likely causes? I have considered some. The power switch may have failed. Or the mechanical link from the front panel to the switch. IIRC there is a pin on the M/B-P/S connector that provides an input to the supply so that the supply turns on.. Is that a set level? What controls it? I am considering having him drive down with it. I can repair electronic devices, but I have never come across this situation. Is there a likelihood that the fault is in the M/B? Thanks, Charlie The light is simply wired to the standby output of the PSU. I've seen bad motherboards cause this, could also be the power button or the wiring between that and the motherboard. The other time I saw this the graphics card was not fully inserted in the slot. |
#3
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PC Power supply
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#4
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PC Power supply
Charlie Bress wrote:
My son has an E-Machine T3828 that will not power up. Unfortunately he is around 100 miles away so I do not have more information. There were no changes made to the PC that might have caused this. At first glance it is easy to blame the P/S itself, but a new replacement did not help. A detail: He reports that with either supply there is a single LED on the M/B that lights up. What controls this light? On either P/S there is no other sign of life. No fans turn on. What are the likely causes? I have considered some. The power switch may have failed. Or the mechanical link from the front panel to the switch. IIRC there is a pin on the M/B-P/S connector that provides an input to the supply so that the supply turns on.. Is that a set level? What controls it? I am considering having him drive down with it. I can repair electronic devices, but I have never come across this situation. Is there a likelihood that the fault is in the M/B? Thanks, Charlie This is a very common Emachines failure mode ! About three years old ? M/b CPU, PSU usually. Very often other items are taken out as well. Unfortunately the little led only means the the sb power is there. -- Best Regards: Baron. |
#6
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PC Power supply
Baron wrote:
This is a very common Emachines failure mode ! About three years old ? M/b CPU, PSU usually. Very often other items are taken out as well. Unfortunately the little led only means the the sb power is there. Agreed. I don't recall the model no. but I had to deal with an emachines pc with the same issue. Change the motherboard AND the PSU. If you don't you'll probably find the original PSU kills the new board as well. The cpu will probably be ok. I used an Asrock board for no particular reason other than the job needed doing quickly and it was what the local computer shop had in stock. You will find that when you boot up the computer Windows XP (I assume that is what you have) will not be happy because the motherboard and therefore lots of onboard hardware has changed. All you need to do to fix this is get your XP installation cd, boot up with it and do a repair install. -- Tim Phipps replace "invalid" with "uk" to reply by email |
#7
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PC Power supply
Baron wrote:
This is a very common Emachines failure mode ! About three years old ? M/b CPU, PSU usually. Very often other items are taken out as well. Unfortunately the little led only means the the sb power is there. Yup. Do a Google on 'Bestec' and 'Emachines'. Many tales of woe. -- Adrian C |
#8
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PC Power supply
Greetings Charlie & others..
Regarding: "My son has an E-Machine T3828 that will not power up. Unfortunately he is around 100 miles away so I do not have more information." In spite of a good deal of speculation here which VERY well may be right on the mark with the anomaly, until which time that someone (you) can put your hands in that PC to isolate what is causing the issues - it's guess work at best. Especially at 100 miles of distance. Something to consider, what is your time worth to fuss with it vs. doing what Baron, Tim & Adrian suggest in just replacing the motherboard & CPU. This is presupposing that this system is not under warranty. Now days, with mail-order and fast delivery what it is, it usually doesn't cost that much to remove and replace the entire inside of the system. You've already got a new power supply, consider the cost of going ahead with the rest of the repair/upgrade. Regardless, as indicated, until it can be put on the repair bench, it won't 'compute' on several fronts. Cheers, Mr. Mentor "Charlie Bress" wrote in message ... | My son has an E-Machine T3828 that will not power up. Unfortunately he is | around 100 miles away so I do not have more information. There were no | changes made to the PC that might have caused this. | At first glance it is easy to blame the P/S itself, but a new replacement | did not help. | | A detail: He reports that with either supply there is a single LED on the | M/B that lights up. What controls this light? | On either P/S there is no other sign of life. No fans turn on. | | What are the likely causes? | | I have considered some. The power switch may have failed. Or the mechanical | link from the front panel to the switch. | | IIRC there is a pin on the M/B-P/S connector that provides an input to the | supply so that the supply turns on.. Is that a set level? What controls it? | | I am considering having him drive down with it. I can repair electronic | devices, but I have never come across this situation. | | Is there a likelihood that the fault is in the M/B? | | | Thanks, | | Charlie | | | | | | | |
#9
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PC Power supply
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#10
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PC Power supply
On Fri, 25 Apr 2008 13:22:02 -0400, "Charlie Bress"
put finger to keyboard and composed: My son has an E-Machine T3828 that will not power up. Unfortunately he is around 100 miles away so I do not have more information. There were no changes made to the PC that might have caused this. At first glance it is easy to blame the P/S itself, but a new replacement did not help. A detail: He reports that with either supply there is a single LED on the M/B that lights up. What controls this light? On either P/S there is no other sign of life. No fans turn on. What are the likely causes? I have considered some. The power switch may have failed. Or the mechanical link from the front panel to the switch. Use a multimeter to monitor the PS_ON pin (pin 14, green) in the ATX PS connector. It should go low when you press the front panel power switch. The +5VSB pin (pin 9, purple) should measure +5V. See http://pinouts.ru/Power/atxpower_pinout.shtml If PS_ON doesn't go low, then something is wrong with the motherboard. In this case it won't be the CPU or the RAM because neither are powered in standby mode. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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