Asus B250M-K motherboard is not powered by CPU for repair

Asus B250M-K motherboard is not powered by CPU for repair

Motherboard model: ASUS B250M-K Rev.1.01

Fault phenomenon: the motherboard does not supply power from CPU.

Maintenance process:

An ASUS B250M-K Rev.1.01 motherboard can trigger no CPU power supply.

Asus B250M-K mainboard is not powered by CPU. Maintenance Figure 1

Open the dot bitmap, VCCIO voltage 1.0V is normal, and the CPU power chip is ASP1401BT.

Asus B250M-K mainboard is not powered by CPU. Maintenance Figure 2

Measure that the power supply pin of ASP1401BT chip is 7 pins and 5V is normal.

Asus B250M-K mainboard is not powered by CPU. Maintenance Figure 3

Measure that 3.3V of EN foot is normal.

Asus B250M-K mainboard is not powered by CPU. Maintenance Figure 4

Measure that VRM PGD 0.7V of 6 feet is normal.

Asus B250M-K mainboard is not powered by CPU. Maintenance Figure 5

Measure that all three vids are 1.0V, which is normal.

Asus B250M-K mainboard is not powered by CPU. Maintenance Figure 6

Measure PLTRST 0V from the bridge.

Asus B250M-K mainboard is not powered by CPU. Maintenance Figure 7

Check SYSPWROK and find that SYSPWROK voltage jumps.

Asus B250M-K mainboard is not powered by CPU. Maintenance Figure 8

It is found that SYSPWROK is shorted to SQ6 and PQ3003 on the motherboard.

The level C of SQ6 is connected to the level B of SQ9, and the level C of SQ9 is VCCST_PWRGD, and SQ9 has no screen printing on the motherboard.

The screen printing of PQ3003(SQ6) is S72. Replace 7002, and the CPU is powered.