Gigabyte ga-h61m-s1 motherboard is powered off from time to time

Motherboard model: Gigabyte ga-h61m-s1 rev2.2
Fault phenomenon:auto power off is not started regularly

Maintenance process:

A gigabyte ga-h61m-s1 motherboard, the fault is that the boot is not timed auto power off, sometimes Won’t Turn On.Priority check VCC or temperature control circuit.

Gigabyte ga-h61m-s1 motherboard is powered off from time to time

Gigabyte ga-h61m-s1 motherboard is powered off from time to time Figure 1.

auto power off is usually a certain VCC does not come out or Current protection, mostly check the temperature control, standby VCC and secondary VCC. If it can be turned on, it indicates that there is a secondary conversion. First check slp-s3.

Gigabyte ga-h61m-s1 motherboard is powered off from time to time

Gigabyte ga-h61m-s1 motherboard is powered off from time to time Figure 2.
Find slp-s3 in schematic, which controls the opening of some VCC and signals, such as vcc18_IN、MTB_PWRGD、VCC1_05_1.8V of en, cpupwrok, etc. is available, indicating that slp-s3 has been successfully opened.Q393 pin, 1.8V and Q38 1.05v are normal.

Gigabyte ga-h61m-s1 motherboard is powered off from time to time

Gigabyte ga-h61m-s1 motherboard is powered off from time to time Figure 3.
When measuring slp-s3, it is found that the control VCC is a little low,unstable and q370.9v are basically normal.

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Gigabyte ga-h61m-s1 motherboard is powered off from time to time Figure 4.

When the pin is measured, it is only 0.65v, which is not normal.

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Gigabyte ga-h61m-s1 motherboard is powered off from time to time Figure 5.

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Gigabyte ga-h61m-s1 motherboard is powered off from time to time Figure 6.

After analysis, it may be that 5vdull VCC is abnormal or vccsa VCC is unstable.After careful inspection, it was found that there was a little ash on the pull-up resistor r97 of 5vdull. The dust was scraped off with tweezers and fell off as soon as it was touched. It was corrode Inveracious Soldering.

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