Motherboard : GA-880G-USB3
Fault: No code running or garbled code running, resetting is low
Gigabyte 1880 motherboard, sometimes running garbled code directly, checking all major voltages is normal, but it is found that the PCI reset is only 2.3V, and the 880 motherboard reset requires the south bridge to receive SB_PWROK, so I found a similar drawing,
found that SB_PWROK was transferred from Q63 and Q64, and the D-level of Q64 is only 2.3V, so I found a tube to replace it, and checking the reset pin is also low, so I disconnected Q357, and found that Q64 is still low, indicating that the problem is pull-up. ,
found that it was pulled up by 3VDUAL_SB. The standby voltage was measured to be low, and I was depressed and could still power on. Well, I was deceived by this board. Generally, the bridge is not powered on when it is low. So I found this adjustment resistor and replaced it.
3.3V came out
. The code was OK when powered on!
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