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#1
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Weird sequence of events with multiple processors seemingly dying
NF7-S mobo w/Mobile Athlon 2500 @ 2455Mhz (11x223)
My CPU temp has always appeared in negative temperatures so I naturally assumed that the sensor was screwed up. Needing an idea of what the temp. is, I bought a secondhand Digital Doc. I managed to get one of the flat sensors wedged into the top of the heatsink, fairly near the base. I always added 10 degrees to this when guesstimating the cpu temp! Wanting a more accurate measure, I decided to try and slide two flat sensors PARTIALLY underneath the cpu whilst the lever was raised, then lower the lever and have them wedged in. I removed my motherboard and installed them so they weren't touching any pins. When I'd put everything back together again, the PC booted up but the monitor didn't come on. I realised I had a problem and instantly powered off. I removed the motherboard and the sensors, then tested everything again. This time it was ok. Before returning the motherboard to the case, I decided to take a close look at the mobo-based sensor under the cpu. When I looked closely at it, it seemed to be too far from the cpu itself. I bent it upwards so that it would touch the cpu - not thinking that this could cause any damage. When I turned the PC back on, the fans started and the HDD's began to spin-up but everything just cut out and stopped. The light on the mobo was on and didn't do anything so I tried again - same thing happened. Somehow forgetting that I'd made a significant change by moving the sensor, I tried a 2600 athlon. Same problem. Next up a 2000 athlon... nope, nothing happening. I took my processors over to my other PC (PC#2) and quickly removed the cover and first tried the mobile 2500. Exactly the same problem occured - it switched off after a few seconds. This repeated itself with the next two processors. I was absolutely gutted. I couldn't believe I'd wrecked 3 cpu's in about 5 minutes.Amazingly, it was only now that I recalled having adjusted the sensor on my NF7. I bent back the sensor and installed the cpu but the problem was the same. Over the next 20 minutes I switched PSUs around, tried different cables and even turned off major appliances in the hope that there was some sort of overload going one. Out of nowhere, the idea came to cover the sensor with something. The obvious material seemed to be a piece of an anti-static bag . I cut a tiny square and covered the sensor. When I switched the pc on with the mobile athlon...success! I tested the 2000 next - yay! Finally the 2600. That didn't work but I wasn't too bothered as it doesn't have a place in any PC I own right now. It was only now that I had connected up my PC speaker. All three produced a two-tone siren (overheating or out of specification voltages?)which stopped on the mobile2500 and 2000 but continued on the 2600 until I switched off. Having found a solution, I bent the sensor back and made sure the anti-static material was in place. The PC booted up fine and delivered a real temp. reading at last. Before putting the mobo back in the case, I again tested the 2000 in PC#2. Now, before all of this nonsense began, that athlon 2000 had been running on PC#2 without problems. I put it back in #2 but it went back to the switching itself problem! How? Why? What??!?! There isn't a sensor on PC#2! I hadn't adjusted anything! It seemingly copied it's more impressive counterpart. Once I'd got the mobo back in the case and upstairs, my NF7-S decided to give nonsense voltages again. Although this was very frustrating, I'm more than happy that it works at all! |
#2
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As to nonsense voltages, you could get a bunch of the little red insulating
washers at a computer shop and put them on both sides of the motherboard at each mounting point. Just in case it's shorting to ground. -- Ed Light Smiley :-/ MS Smiley :-\ Send spam to the FTC at Thanks, robots. |
#3
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Make sure the little bit of anti-static plastic doesn't melt! I dont know
what temp this would happen, but its only thin plastic! "SpellmanXP" **** wrote in message ... NF7-S mobo w/Mobile Athlon 2500 @ 2455Mhz (11x223) My CPU temp has always appeared in negative temperatures so I naturally assumed that the sensor was screwed up. Needing an idea of what the temp. is, I bought a secondhand Digital Doc. I managed to get one of the flat sensors wedged into the top of the heatsink, fairly near the base. I always added 10 degrees to this when guesstimating the cpu temp! Wanting a more accurate measure, I decided to try and slide two flat sensors PARTIALLY underneath the cpu whilst the lever was raised, then lower the lever and have them wedged in. I removed my motherboard and installed them so they weren't touching any pins. When I'd put everything back together again, the PC booted up but the monitor didn't come on. I realised I had a problem and instantly powered off. I removed the motherboard and the sensors, then tested everything again. This time it was ok. Before returning the motherboard to the case, I decided to take a close look at the mobo-based sensor under the cpu. When I looked closely at it, it seemed to be too far from the cpu itself. I bent it upwards so that it would touch the cpu - not thinking that this could cause any damage. When I turned the PC back on, the fans started and the HDD's began to spin-up but everything just cut out and stopped. The light on the mobo was on and didn't do anything so I tried again - same thing happened. Somehow forgetting that I'd made a significant change by moving the sensor, I tried a 2600 athlon. Same problem. Next up a 2000 athlon... nope, nothing happening. I took my processors over to my other PC (PC#2) and quickly removed the cover and first tried the mobile 2500. Exactly the same problem occured - it switched off after a few seconds. This repeated itself with the next two processors. I was absolutely gutted. I couldn't believe I'd wrecked 3 cpu's in about 5 minutes.Amazingly, it was only now that I recalled having adjusted the sensor on my NF7. I bent back the sensor and installed the cpu but the problem was the same. Over the next 20 minutes I switched PSUs around, tried different cables and even turned off major appliances in the hope that there was some sort of overload going one. Out of nowhere, the idea came to cover the sensor with something. The obvious material seemed to be a piece of an anti-static bag . I cut a tiny square and covered the sensor. When I switched the pc on with the mobile athlon...success! I tested the 2000 next - yay! Finally the 2600. That didn't work but I wasn't too bothered as it doesn't have a place in any PC I own right now. It was only now that I had connected up my PC speaker. All three produced a two-tone siren (overheating or out of specification voltages?)which stopped on the mobile2500 and 2000 but continued on the 2600 until I switched off. Having found a solution, I bent the sensor back and made sure the anti-static material was in place. The PC booted up fine and delivered a real temp. reading at last. Before putting the mobo back in the case, I again tested the 2000 in PC#2. Now, before all of this nonsense began, that athlon 2000 had been running on PC#2 without problems. I put it back in #2 but it went back to the switching itself problem! How? Why? What??!?! There isn't a sensor on PC#2! I hadn't adjusted anything! It seemingly copied it's more impressive counterpart. Once I'd got the mobo back in the case and upstairs, my NF7-S decided to give nonsense voltages again. Although this was very frustrating, I'm more than happy that it works at all! |
#4
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"Gareth Tuckwell" wrote in message ... Make sure the little bit of anti-static plastic doesn't melt! I dont know what temp this would happen, but its only thin plastic! I wondered about this too! I'm sure it won't be long before I make another attempt to fix the sensor, so I'll probably replace it with "something better" - but what??? |
#5
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Make sure the little bit of anti-static plastic doesn't melt! I dont know
what temp this would happen, but its only thin plastic! I wondered about this too! I'm sure it won't be long before I make another attempt to fix the sensor, so I'll probably replace it with "something better" - but what??? What about a bit of electrical insulating tape or even celotape? I don't suppose either would melt, but I know nothing about their properties regarding heat - anyone help out here - is celotape conductive? What temp melts it? |
#6
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Electrical tape is not conductive but celotape can be conductive and it
melts. Try some thermal tape or strips like you get with a heat sink. It's not suppose to conduct electricity. You might check the motherboard connection where the thermal resistor attaches, could be loose. Sounds like a bad sensor (thermal resistor), is the MB still under warranty? Don't forget to disable the thermal safety features in the BIOS they will shut down the computer with a two tone siren if the temperature exceeds the thresholds. "Gareth Tuckwell" wrote in message ... Make sure the little bit of anti-static plastic doesn't melt! I dont know what temp this would happen, but its only thin plastic! I wondered about this too! I'm sure it won't be long before I make another attempt to fix the sensor, so I'll probably replace it with "something better" - but what??? What about a bit of electrical insulating tape or even celotape? I don't suppose either would melt, but I know nothing about their properties regarding heat - anyone help out here - is celotape conductive? What temp melts it? |
#7
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maybe the liquid insulation stuff?
-- Ed Light Smiley :-/ MS Smiley :-\ Send spam to the FTC at Thanks, robots. |
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