Yingtai B85 mainboard does not light up for repair

Yingtai B85 mainboard does not light up for repair

Yingtai B85 motherboard does not light up, and the system lights up successfully after brushing BIOS.

Machine model: Yingtai B85

Fault phenomenon: Repeated power failure and restart

Maintenance process: get the machine, test 5V 3.3 PCH1.05V, reset 3.3V, memory power 1.5V spd3.3V, CPU power 1.75V, CPU module ISL95812HRZ VR under the guidance of the maintenance space of the Xunwei forum according to the customer’s description_ RDY voltage 1.64.

Yingtai B85 mainboard does not light up for repair Figure 1.

The voltage should be 3.3V normally. After measuring that the 96 and 95 pins of the IO IT8728P are 2V, it suddenly occurs to me that it is not a problem with the BIOS, because the power supply is basically normal (the BIOS has been flashed before, but the motherboard has been brought by someone else, and it has not been repaired). I found the BIOS on the official website, and it was successfully powered on.