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ACER ASPIRE - T690 computer ... purchased about 5 years ago. It has a problem ...?
Its always been heat sensitive especially during the summer months. The blower fan for the microprocessor and the circulation fan would come on multiple times a day during the summer months making a dreadful noise. I even had to take one panel off the case and place a table fan pointing at the internal circuity. This solved the problem for a while. About a year ago, whatever was going bad, went bad. Now, when I power the computer up, all it does is produce a tone of about 800 Hz. Beyond that, the computer doesn't work at all. I'm trying to isolate the problem. I suspect that it is a power supply component problem. Here's why. When I turn the computer on, the CPU fan and the circulation fan both turn on once and stop, then a moment or two later both fans will kick in and run. At exactly the same time, there is this loud tone noise of about 800 Hz that happens. I pulled a plug near the CPU fan with 2 yellow wires and 2 black wires from the motherboard and the tone noise goes away, and both fans speed up significantly. The DC voltage on the two yellow wires is 11.2 volt when the fans are running, and exactly 12.0 volts when there is no load on the yellow wires. Nothing else happens. Power supply voltages read + 5v, + 12v, and + 3.3v. I can't tell is the tone noise is coming out of the power supply (which I highly suspect -- it being a switching P.S.) or from some where else on the motherboard.
Anyway, I'm wondering if anyone else has ran into this kind of problem before or has any ideas about it, like where the tone might be coming from or additiona measurements orl tests I might can run?
I have test equipment like DVM, oscilloscope, function generator, and frequency counter.
Many thanks in advance.
Best regards
Okay, here's what I found: the 800 Hz tone comes from a small round black 1" dia. piezoelectric element situated below the CPU fan and just to the right of chip with a relatively large silver heat sink on top of it. The tone is not due to memory card problems or any other card problem. It is a 'heat' related problem. Close to the 800 Hz piezoelectric element is what I believe to be a thermistor (temperature regulated component). I believe that it is this thermistor that is the source of the 800 Hz tone and the resulting computer problems. During the course of my trouble shooting, at one point the 800 Hz tone stopped and the computer came up and started working right. It run good for about three hours and got hot. On the top front hard-drive panel there is a green power indicator light and a red light right next to it. When the computer got hot this last time, the red light came on and grew brighter as the heat related problem heightened. At this point, I turne
2 Answers
- 9 years agoFavorite Answer
lets face it, electricity is a ***** sometimes... if you or a friend have any power supplies laying around, try switching it out. or you can give up and say the computer is dead. if you do the latter, you should rip out the hdd and if your lucky you should be able to get some stuff off of it.
the easiest way (although not very cost effective) would to just take it in to geek squad or staples or some local pc center and let them deal with it, if you can sound like you know what your talking about, they might lower the price. ( i did this at BB when i had speakers installed and saved almost $50)
- Anonymous5 years ago
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