RAM slots unavailable: B dead on ASRock B450M Pro4
RAM slots unavailable: B dead on ASRock B450M Pro4
I purchased a used ASRock B450M Pro4 with two years. During testing I found that both slots B are dead. In slot A I can install 16GB (two 8GB) without issues, but placing some of them in slot B causes it to fail. Possible reasons: - RAM: I'm using 2x8 DDR4 16GB G.Skill Aegis 3200MHz [F4-3200C16S-16GIS], which seems fine in slot A. I think they are okay now. - CPU: My Ryzen 5 3500X works well, but I read that it might be related to the CPU. Since it's either the CPU or motherboard, I decided to test a new motherboard and everything functioned properly with dual-channel. - Motherboard: I upgraded to the latest BIOS version, but it didn't affect anything. Visually it looks normal. However, after testing a new motherboard, it seems the issue is likely with the motherboard itself. The complete failure of slots B is something I've seen before? Would you agree with my assessment? Thanks ahead.
There are four potential reasons for the entire RAM channel failing initially. First, the CPU might be involved; often this happens due to bent or missing pins on the CPU side (PGA) or the CPU socket. Second, solder joints and traces can corrode because of oxidation, creating gaps between contact pins and motherboard traces, which weakens the connection. Third, debris in the RAM slot or the CPU socket can be a problem—broken pins inside the slot may also lead to this issue. Fourth, the RAM itself could be faulty. Since you've eliminated the CPU and RAM, focus on the second and third problems. The third issue is usually fixable by cleaning the RAM slot with a brush or using compressed air to remove dust. The second problem can be more challenging; if you still have a warranty, consider returning it via RMA, as your board is only two years old and most manufacturers provide a three-year warranty.
I attempted to improve the RAM slot cleaning, but I had limited resources, so I used WD40 and cleaned it thoroughly with a brush. The issue persists, which is unusual since the two B slots are often affected by damage. This suggests the problem might be in the CPU socket, prompting me to remove it for further inspection and cleaning.
Wd40 probably won't help; try 99% IPA and clear the RAM slots and CPU pads.
WD-40 isn't ideal for electronic devices—though it might seem acceptable, it can lead to issues. For optimal cleaning of slots or CPU sockets, use an electrical contact cleaner or a similar product. Ensure the product is labeled "Plastic safe" to avoid damaging plastic components. If it meets this requirement and is suitable for electronics, it should function properly.
I took out the CPU socket and checked the issue (refer to the photo). Does this address your concern? If so, could you try repairing it?