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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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IBM ThinkPad A21m Thermal Problem
Hello everybody.
I need some help with an IBM ThinkPad A21m, 2628-D1S type. It have some problem with the CPU fan.After a long period to be off, it boots ok, and can work for a little while, but suddenly it falls off. After that, it enters in a quick boot-fail cycle. If i leave it off for a while, it can boot again, but go quickly do dead again.The cause is CPU overheating, because the CPU fan dont work. But, the fan is OK (i tested it ith direct poer supply (5V)), and occasionally it starts ok with the notebook boot up, but it stops and donīt restarts. It looks like some power management or thermal sensor failure, or maybe the BIOS... i don't know. Has anybody seen this kind of problem before? Can anybody put some light on this? Thanks from now. Juan Villagra. ERdM |
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G'day Juan,
Go to this link http://www-1.ibm.com/support/docview...sg1MIGR-4PER6S and download the hardware maintenance manual. What I normally do is check externally for any obvious obstructions to air flow at the air intake and vents. If you've never taken apart a laptop then I suggest being very careful with dismantling the Thinkpad, as the A21 is relatively complex to dismantle. If you do decide to dismantle it, follow the intructions meticulously. Keep record of which screws go where. Take anti-static precautions and try to avoid touching circuitry. Once the covers are off, it is relatively easy to remove the heatsink/fan assembly. I'd clean the fan blades by at least blowing them out, and I'd make sure that there is a good contact between the heatsink and the processor - use some thermal paste. You can approach IBM re purchasing a new fan/heatsink assembly, but unfortunately you may find that the system board needs replacing, and that is very pricey. You also run the risk of putting the Thinkpad out of action completely, so be careful. Henry. "Juan Villagra" wrote in message om... Hello everybody. I need some help with an IBM ThinkPad A21m, 2628-D1S type. It have some problem with the CPU fan.After a long period to be off, it boots ok, and can work for a little while, but suddenly it falls off. After that, it enters in a quick boot-fail cycle. If i leave it off for a while, it can boot again, but go quickly do dead again.The cause is CPU overheating, because the CPU fan dont work. But, the fan is OK (i tested it ith direct poer supply (5V)), and occasionally it starts ok with the notebook boot up, but it stops and donīt restarts. It looks like some power management or thermal sensor failure, or maybe the BIOS... i don't know. Has anybody seen this kind of problem before? Can anybody put some light on this? Thanks from now. Juan Villagra. ERdM |
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"hemyd" wrote in message u...
Thanks for the aid, but i have an update: There is no a thermal problem, but an motherboard thing: The fan behavour is a synpthom, not a cause. There is that the system falls down, and turns averything off, including the fan. Well, it looks as the motherboard have some electronic hardware failure, that when reached by the system, it cause a collapse. Looks like thermic, because when cold, it stands longer, but now i think it is some kind of broken soldering, or false contact, yhat because when it fails, and the CDrom reader repeatedly starts spinning, a sparking noise occasionally comes from some part of the M.B. Any ideas, anybody? In this moment, i'm ready to quit, and sugest replacement of the mainboard. Any help is welcome. Thanks to all. Juan Villagra. ERdM |
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