Yes, a damaged VCCSA pin could prevent the motherboard from powering the system properly.
Yes, a damaged VCCSA pin could prevent the motherboard from powering the system properly.
Hello, I purchased a used MSI Z270 Pro Carbon motherboard at a very low price, with just one broken pin. From what I can see, the board itself appears okay except for that pin. I’ve tested it with a 7th-gen processor, RAM, and PSU, but there are problems: when I try to boot the system, the CPU LED turns red, none of the RGB lights activate, and it won’t start no matter how many times I attempt (even fifty times). However, if I cut power to the PSU, remove static charge from the system, and then restart it, it boots normally. I ran OCCT stress tests on both CPU and RAM, and everything was fine. But once I shut it down and tried to turn it on again, the CPU LED stays red and it refuses to boot. Swapping RAM slots, using a different PSU, or changing the CPU didn’t help. The only consistent solution seems to be discharging static electricity before powering it up again. I saw online that the broken pin might be connected to voltage regulation. Could this broken pin be the reason for these issues? How can I be absolutely sure it’s the cause? What might be the main reason behind this problem?
They supply power to the imc mainly through the VCCSA voltage. Based on the names, these are VCC pins and having a few broken ones shouldn't be a big problem since they're redundant. The power cycling seems unstable, possibly due to RAM incompatibility. My Z170A gaming pro works with a Micron Rev E stick but not with a Hyundai DJR stick, suggesting a RAM issue. If that doesn't resolve it, consider removing all heatsinks and the CMOS battery, briefly clearing the CMOS with jBat1, then powering it on for a short time. Rinse with water and brush gently with a toothbrush to clean thoroughly. Let it dry before testing again.
For the Z170A I purchased for $15, it had random shutdowns in Windows. Fixing that resolved the issue, though I've seen many boards with the same problem except for a Chinese H61 model that only booted non-booting. It might help to update the BIOS, using a Ch340A and female-female jumpers as backup. You may want to back up the BIOS before proceeding, as a normal update could brick the board.
The broken pin can cause the MoBo to malfunction (unless it's properly grounded, as shown in the diagram). Consider filing a warranty claim and obtaining a replacement. Although the broken pin is mainly for voltage regulation, it's still required there. Only the grounding pins need to be intact. If a grounding pin is damaged or bent, it's generally fine, but if it contacts another pin, you won't be able to use the MoBo.
You could try confirming with a multimeter that there's a short between the broken one and upper or right side one. If so, it could still power a different circuit in the CPU, not all tied together inside CPU like ground is. In a "stranded on Mars and gotta science the sh*t out of it so you get back" you could try shorting the CPU pads so that circuit gets fed by the pin next to it. If that broken pin is electrically connected to the one next to it. But don't think it's worth risking the CPU for it. Just get another mobo.
If it's not needed, I won't consider it. I missed the start of your question. I'd only purchase a new board if I were you. Avoid used boards with LGA connectors—stick with PGA types like AM4. Don't buy used PGA CPUs unless the listing includes pin diagrams from all sides plus the back.