I received a Gigabyte B75 motherboard from my colleague and asked me to help me see if it could be repaired, so I could tighten the point and wait for the result. [Motherboard Model]: Gigabyte B75 [Repair Process]: Plug in the diagnostic card and the reset light is always on, whi

2025/06/2618:25:34 hotcomm 1275

will be used as a GIGABYTE B75 motherboard , and asked to help see if it can be fixed, so that the addition points can be tightened, and wait for the result.

[Motherboard Model]: Gigabyte B75

[Repair Process]:

Plug in the diagnostic card and the reset light is always on, which seems to be another difficult thing to crack. It seems that there are many things to be checked if the motherboard has not been reset, but fortunately there are still drawings. Let's check it out from the CPU first!

main power supply vcore: 1.1v

bus power supply VTT: 1.1V

phase lock loop power supply PLL: 1.8v

house power supply: 0.9v

CPU memory module power supply VCC-DDR: 1.5V

bridge power supply VCC1_05_PCH 1.1v

vcc1_8_pch 1.8V

memory power supply 1.5V (invitation code: hvbeez)

main power supply seems to be normal.

measurement pcie A9 pin 0V a13 a14 0.45v

PCI A15 0v B16 1.5V

It seems that the motherboard is powered, the clock is good, the motherboard has not reset. When the

bridge meets the power supply conditions, it is also necessary to receive a good signal from the CPU management chip as a condition for bridge reset.

Check the drawing CPU tube through two resistors and two transistors, and the resistor voltage divides to generate a good signal N_PCH_VRMPWRGD notify the bridge CPU voltage OK.

In actual measurement, it was found that the good signal of the CPU vr_rdy is only about 0.5v, so dq17 will turn on and pull down N_PCH_VRMPWRGD. If the bridge cannot get it, it cannot send a reset. The actual N_PCH_VRMPWRGD signal is 0.0, and it seems that it has been found.

For quick verification, DQ17 was directly removed.

plug in the diagnostic card and power up, and directly run the code and light it up.

Author of this article: Xunwei ID: (low-key little life)

Computer maintenance official account: weixiuhao123

Xunwei.com official account: xinxunwei

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