What to do with the motherboard power shortage

What to do with the motherboard power shortage

1, to determine if it is a power problem, first unplug all connectors on the motherboard.

Find a paper clip.

Locate the 24-pin (20-pin) line above the power supply and find the green and black lines. The Green Line is only one, and the black line is a few, choose the next to the Green Line of a few black any one can!

Insert a U-shaped paper clip into a green hole and plug it into a hole on any black line next to the Green Line.

After inserting the paper clip, you can then connect the power cord and start to power up.

If the fan of the power supply turns at this time, the basic possibility is that the power supply is no problem.

If the power supply fan does not rotate, basically can judge is the power problem, need to replace the power test.

2, check the power supply is normal, separate use of power and motherboard boot, with a screwdriver short connection to the motherboard on the powers of the SW pin,

At this point the motherboard power, the power supply fan will rotate, then at one time add, memory, graphics, hard disk, connecting line, until the failure to reproduce can be found to cause the motherboard does not power the fault parts, if the motherboard or not power, then the fault parts for the motherboard.

Motherboard power supply solution for the problem of two:

1, detection of the field effect tube is penetrated, if the breakdown is replaced.

2, if the field effect tube has not been penetrated, the test field effect tube s very have no voltage output, if not, There is no 3.3V or 5V voltage input for the D pole of the detection field effect tube, if there is, the test field effect tube Gate has no 3-5v control voltage, if there is, the field effect tube bad, if not, detect LM358 12V power supply is normal, if normal, check the power socket to LM358 chip positive input end (fifth foot) Between the components of the fault (such as partial voltage resistors, WL431, etc.), if the input end is normal, then LM358 damage.

3, whether it is the memory power supply circuit, or CPU power supply circuit, if there is a field effect tube breakdown, it is best to replace the filter capacitor, or the capacitance of the strict detection to prevent leakage, resulting in the field effect tube again breakdown.

4, filter capacitor deterioration or power management chip output voltage is low, will cause the memory can not be found or appear blue screen, panic, Huati, black screen. 5, memory plug will cause memory power supply road burned.

6, excessive memory, will increase the memory power supply circuit burden, resulting in circuit burning.

7, Memory gold fingers and memory slot bad contact, cleaning or scraping groove.

8, memory damage, replacement