On Cpu fan connector with 4 pins the voltage description are as mentioned below.
These details will help.
Thanks.
The Cpu fan connector pin voltages are as follows:-----
See the image shown below:-----
![motherboard Cpu fan connector cpu fan voltages](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgf252SsRuFyrDkw4kHIOs2UZtzGvBMobbVfHVTSW2cdH4hoMrMdl9CqSIH7puujWQDHROYfI1RvX2MZGlQLZKPMAHshsPVJPUWCnfK7JSWGIC1d7tdkO7bGN8i17hIodJCqg_DHUWI_ss/s1600/cpu+fan.bmp)
These details will help.
Thanks.
For more help go through these help links:----
Troubleshoot Dead Motherboard
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Troubleshooting CPU Overheating Problem on Motherboard
http://technoanswers.blogspot.com/2012/10/troubleshooting-cpu-overheating-problem.html