motherboard beeps like ambulance (more complex problem) - helpappreciated!
in [Hardware]
|
Prev: motherboard beeps like ambulance (more complex problem) - help appreciated!
Next: tape as an archival medium
From: Paul on 28 Jun 2010 05:52 Peter Able wrote: > "bj" <spillout99(a)yahoo.com> wrote in message > news:i09ijn$899$1(a)news.net.icm.edu.pl... >> Good morning, >> >> I had my PC repaired recently; the guy who came replaced the motherboard > and >> the graphics card. Afterwards, I found that he had put in a weaker > processor >> (AMD Athlon 2000) than I had had before (2200), so I wanted to replace > that. >> I detached the processor fan and replaced the processor. >> >> Now, when I turn the PC on, for half a second a green diod lights up and > the >> fans go on, then the motherboards starts emitting pulse beeps like an >> ambulance siren (eeeeooooeeeeooooeeeeoooo...) and everything (but the > beeps >> and the red diod) stops. Does anyone have an idea what the problem may be, >> please? This persists also when I switch back to the old processor. >> >> I had checked forums and found that this signal is typically emitted when >> the processor temperature is too high. The old one that I removed had some >> old paste on it, but the new one does not heat up in the half-second when >> the PC seems to be working. >> I plugged in the CPU fan and radiator (only did not click it on yet as > it's >> rather difficult, it requiring detaching the whole motherboard, but this >> should not matter, should it?); >> I switched the CMOS (?) jumper back and forth and even removed the battery >> for 1 minute; >> I removed and put the memory back in, checking the connections; >> No capacitor seems to be swollen; >> Apart from replacing the processor I didn't seem to be do anything. >> >> Motherboard: Abit HF7; processor: AMD Athlon 2200 >> >> Could anyone suggest a solution, please? I have no more money for another >> repair, and this is rather exasperating... >> Loads of thanks in advance! >> >> -bj >> >> > Just a couple of possibilities: > > Well down your notes you say "I plugged in the CPU fan and radiator (only > did not click it on". If you've been running the CPU without its heatsink > firmly fitted then you've almost certainly killed the processor(s). > > The other possibility is that you've damaged a thermistor (temperature > sensor) on the motherboard. I don't know your particular MB, but many have a > small thermistor on the MB centred immediately under the CPU socket. > > Agreed. Fitting the heatsink/fan assembly is crucial. I can see a picture of the Abit NF7 version 2.0 here, and there is an eight pin chip located within the processor socket. That could be an overheat detector. I had a similar concept on my A7N8X-E Deluxe, where a chip was placed on the motherboard, to monitor the diode temperature. http://www.xbitlabs.com/articles/mainboards/display/abit-nf7_2.html What that does, is take measurements from the diode anode and cathode, right on the CPU die of the Athlon processor. If the voltage developed across the diode passes a certain threshold, the eight pin chip has a "shutoff" signal that can be tied into the power supply PS_ON# logic. And that would be why the motherboard is switching off. This datasheet, is an example of a chip used for the function. Attansic makes a similar one, but without SMBUS connections. When a chip like this has SMBUS connections, you can also read out the temperature with Speedfan or a similar utility. http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf Properly fitting the heatsink/fan assembly, is all that is required at this point. That means cleaning off the old paste, applying a bit of fresh paste, then "clicking down" the heatsink assembly. There could be a metal clip, with either one-hole or three-hole pattern on the end, which fits onto plastic tabs on the side of the socket. (Instructions for applying paste) http://www.arcticsilver.com/pdf/appmeth/amd/ss/AMD_app_method_surface_spread_v1.1.pdf The only danger, while fitting the metal clip, is having your tool slide off the clip and hit the motherboard. Some clips could be addressed with a hex driver, rather than a flat blade screwdriver, and the hex driver wouldn't slide off as easily, reducing the risk of striking the board. (The end of the hex driver, fits over a raised metal tab on the clip, which is why the hex driver won't slide off.) Even so, in the NF7 in the picture above, there are protective strips shown on either side of the socket, in an attempt to protect the motherboard from damage. (This is the dangerous part - having the screwdriver blade slip off. In some cases, a hex screwdriver will fit the raised metal bit, and give some lateral control while fitting the clip.) http://www.crazypc.com/images/articles/heatsink/fronthookscrewdriversmall.jpg ( from http://www.crazypc.com/articles/hsfinstall.htm ) On my Nforce2 motherboard, I used a Zalman 7000 cooler, and that one screws to the motherboard, rather than using clips. That avoids some of the dangers of the tab kind. If the motherboard still won't POST properly, then perhaps the new processor IS damaged, and it is time to put the old (2000) one back. To make the "eeeeooooeeeeooooeeeeoooo..." sound, takes execution of some processor code, so I suspect the processor is still alive. If the computer case speaker was completely silent, then you'd be in trouble. Paul |