Troubleshooting CPU Pin Contact Bad method

CPU as the core part of the computer, the frequency of failure is relatively low, in many cases, the failure of the processor is due to the motherboard problem. such as the following troubleshooting, really let the author cost some twists and pains.

Failure performance: a compatible machine assembled for friends in 2004, using the Intel Celeron 1.7GHz processor, has been in use for two years, the most recent in a move, love Machine is unable to start. Fan running normally, the CPU temperature is not high, replace the memory bar also tried, can not solve the problem.

Failure Analysis and removal: Press the chassis power supply, the machine does not have any reflection, for troubleshooting to bring a certain degree of difficulty, no way, can only use the replacement method to find out where the problem lies. So from a friend to borrow a similar configuration of the computer, first from the power supply, with the replacement method to find fault. After changing the friend's CPU, the machine starts normal, runs the test program three hours also not to appear unstable phenomenon. is not the machine's processor is broken, should not, this machine has not been more than frequency, and friends are not often used, and the only application is office Internet.

In addition, the CPU fan is running normally, which also shows that the processor should be free of problems. So I plugged my CPU into a friend's machine. After the boot all normal, the operation is also very stable.

This is strange, CPU and motherboard are no problem, but this motherboard is unable to recognize my original CPU, this is what is going on? So careful observation of two CPUs, a 1.7GHz, a piece of 2.0GHz, also 478-pin Celeron, but it seems that there is no difference. After careful observation, suddenly found that the CPU has a slight clip on the pins. Then remembered, is not due to the CPU socket and CPU pins between the bad contact caused by the fault. But the CPU socket has 478 feet, which foot contact is bad? Considering that the friend of the CPU can be normal operation on my machine, this kind of contact should be relatively slight, so my CPU into the CPU socket, while gently lower pressure on the CPU socket wrench, when the feeling of the plug CPU has a certain resistance , the CPU forcibly unplugged from the socket (this action has a certain risk, attention to socket wrench can not be too tight, pull the CPU to be vertical upward force, or CPU pins bent is very troublesome). So repeat several times, then reload the CPU, buckle the fan, after the boot, all normal.

Failure Summary: This fault is not common, because the CPU pins plated with gold, at the same time, according to Intel's requirements, CPU sockets also need gold-plated, due to gold conductive performance, not easy to oxidize, so the CPU and socket is not prone to contact bad situation. But with the intensification of market price competition, there are many CPU sockets on the motherboard does not have gold-plated, or gold-plated thickness is lower than the requirements of the Intel thickness, so in use, over time, the CPU socket easy to produce a layer of oxide, so that the CPU and socket contact between the bad, resulting in machine crashes and so on. And I use the method is to let the CPU pins and socket friction, thereby destroying the oxide layer on the socket, so that the CPU and socket contact between the best possible to become better.

But this method has always been a palliative, so when buying a computer to buy a high-quality motherboard is a good way to once and for all. In addition, we need to note that when you suspect that the CPU socket contact is bad, do not use rust remover, because rust remover generally have a certain degree of corrosion, but also a certain degree of electrical conductivity, so the use of rust-removing fluid may cause your motherboard completely burned.