Gigabyte GA-H110M-DS2V power on and power off for quick repair

Gigabyte GA-H110M-DS2V power on and power off for quick repair

Gigabyte GA-H110M-DS2V is powered on and powered off quickly, and 2_ Both ends of the 5LEVEL and OBC16 are infinite. OBC15 is not installed directly, and it is OK to turn on the machine.

Machine model: Gigabyte GA-H110M-DS2V REV: 1.0

Fault phenomenon: fast startup and power-off

Maintenance process: get the machine and test that there is no short circuit in the upper tube of CPU power supply. VCCIO 0.95V is only 0.45V and VCCSA power supply is not. Test VCCIO_ EN_ 1 Only 0.45V.

Gigabyte GA-H110M-DS2V power on and power off for quick repair Figure 1.

Tracing 2_ 5LEVEL found that the voltage was only 1.1V, which was generated by the fourth pin of IO.

Gigabyte GA-H110M-DS2V power on and power off for quick repair Figure 2.

After the voltage division of two resistors, the resistance value measured online is K, and the two capacitors OBC15 and OBC16 are not installed on the drawing, but the real object is installed. The resistance value measured at both ends of the capacitance is only about 200 Ω, which is abnormal.

Gigabyte GA-H110M-DS2V power on and power off for quick repair Figure 3.

Remove the two capacitors and find that 2_ The value of 5LEVEL to ground resistance increases a lot. It is measured that there is a resistance value at both ends of OBC15, but there is an infinite resistance value at both ends of OBC16. The OBC15 is not installed directly, and it is OK to turn on the machine. The maintenance is over.