Graphics problem on Dell Inspiron notebook
in [Hardware]
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From: Sydney on 8 Apr 2010 02:59 "Paul" <nospam(a)needed.com> a �crit dans le message de news: hpg0jd$igb$1(a)news.eternal-september.org... > Sydney wrote: >> "Paul" <nospam(a)needed.com> a �crit dans le message de groupe de >> discussion : hpf04i$9i4$1(a)news.eternal-september.org... >>> Sydney wrote: >>>> After approximatly 45 minutes of operation, the screen get scrambled. I >>>> suspect a problem of heating since none of the 2 fans operate when I >>>> switch on the notebook. >>>> anybody for an idea ? >>>> Is there a specific newsgroup for Dell ? >>> >>> If you know the fans are malfunctioning, why continue to run the machine >>> ? >>> Operating the machine at a high temperature, will shorten its life. And >>> if you're not careful, could lead to a battery malfunction. >>> >>> You can try Speedfan if you want, and see if that can adjust the fan >>> speed. >>> If the fans still do not spin, clean them out. >>> >>> http://www.almico.com/speedfan440.exe >>> >>> It is also possible, for the power source feeding the fans, to be >>> broken. >>> Some people with retail motherboards in desktop computers, manage to >>> burn >>> out the +12V copper track, feeding the fan headers. But that happens, >>> because >>> it is too easy on a desktop computer, to play with the fan header >>> connector >>> while the computer is powered (and one mistake can result in damage). >>> >>> Paul >> This notebook was given to me to see what was the problem. >> i have described what I saw. >> My question was rather : Do you know enough the Dell Inspiron to acertain >> that the fans should run as soon as they are in operation or should they >> run at a certain temperature. >> I am conscious of the effect of heat on components. > > The fans should be temperature controlled. The reason for that, is > the laptop manages power consumption, and a fan draws power from > the battery. When the laptop is turned on, it is still cold, so > can run for a few minutes, before the fan comes on. The fan is only > used, to keep temperatures to relatively high limits. > > If a laptop has a powerful graphics subsystem, it might have one fan > for the CPU and one for the GPU. Or, it could have one blower, tied > to both chips, using heatpipes. > > The CPU and the GPU could have thermal diodes, which are devices on > the silicon die, to monitor temperature. Depending on the design, > the CPU fan speed may be automatically monitored. (Some SuperI/O > chips can be programmed to automatically operate the fan, as > a function of the measured temperature.) I'm not sure what > they use for the GPU, but it could take advantage of the same > concept. Some Intel chipsets, also have built-in fan control > (QST?). > > In any case, I suggest installing SpeedFan and verifying the fans > still work. The program can set the fan speed manually. The program > can also read out temperatures. At least, as long as the chip > detection routines work properly when the program starts. > I think the fans re temperature controlled. Dell does not give details about the sensors the machine may have ( nor any repair manual) I will test with speedfan and possibly with a voltage controller at the fan terminal. |