Power-off repair triggered by Gigabyte GA-B85M-D3V

Gigabyte GA-B85M-D3V triggered the power failure, dried the resistance, and the troubleshooting and maintenance were completed.

Machine model: Gigabyte GA-B85M-D3V

Fault phenomenon: power failure occurs after triggering for a few seconds

Maintenance process: Take the machine and measure the voltage according to the time sequence. It is found that there is no high-low high jump from the switch to the 104 pin of IO, and there is no high-low high jump from the IO to the 101 pin of the bridge. Do you think the IO has failed?

Originally, I wanted to check the BIOS according to the common fault. Later, I thought that the voltage detected by Gigabyte was also one of the common faults. After measuring 5V, the voltage detected by 2V was normal. After measuring 12V, the detection voltage is as high as 4.5V. By the way, a breakthrough is found and the resistance is dried decisively.

When the two resistors are disconnected for a certain amount, it is found that the resistance values are normal. Is it difficult to avoid poor contact? Once again, the resistance was installed back, and it turned on miraculously. However, the 12V detection voltage was still 4.5V, and the CPU triggered the CPU temperature to rise. To think about it, two resistors were found on the blank plate and it was divided into 1.8V. Now the CPU temperature was normal, and the unit was turned on. The maintenance is over.