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ASUS B85M-K Plus mainboard no booting repair
Main board model: ASUS B85M-K Plus
Symptoms: motherboard no booting
Maintenance process:
A ASUS B85M-K Plus motherboard, boot prompt CPU OVER VOLTAGE ERROR……. Then F1, boot will crash soon.
ASUS B85M-K Plus mainboard no booting repair figure 1.
Many altar friends say that it is the detection circuit problem of 5V 12V and VCORE, that is to say, the related detection resistance near IO is bad. However, this board is not. This time, the VCORE VCC is 2.35 V, which is much higher. In those places where the resistance is detected, P_VCORE_VREF_10, P_VCORE_COMP_10, and the related VCC such as EN turn-on are all normal.
Replace a VRM chip, and the fault remains unchanged. All the Capacitor resistors around VRM chip Measuring diode value, and it is found that there is a big difference in one place.
ASUS B85M-K Plus mainboard no booting repair figure 2.
ASUS B85M-K Plus mainboard no booting repair figure 3.
After entering VRM chip, it was renamed P_VCORE_SET2_10, and the online measurement was less than 1. The resistance was 90.9K Replace the resistance of the same type, and the measured VCORE was 1.74V It entered the system normally, and the copying machine was normal for half an hour. Troubleshooting.
