The PC case seems to be struggling with power delivery.
The PC case seems to be struggling with power delivery.
When you touch the PC case, you sense a steady electric presence around 12V with minimal current. It doesn’t produce a strong static shock because it remains consistent. The problem might lie elsewhere—such as poor grounding in your home outlet or an issue with your power supply unit. Let me know if you'd like help checking those.
It’s a problematic area here. The best approach is to use a multimeter to pinpoint the exact location.
You can rely on the PSU and grounding tester as primary checks. Other potential spots for verification include the electrical panel and any exposed wiring near outlets or switches.
These are probably the two most probable locations. A faulty power cable is possible, though less likely. There could be another spot I haven’t considered yet, but let’s focus on these first.
I replaced the cable, but it’s missing now. Also observed the cable that causes shocks is loose on the PSU side. It seems something might be faulty there. This makes me think: why does it shock at all without proper grounding? Could indicate another component isn’t functioning correctly? I’d expect the PC case shouldn’t constantly discharge even without grounding.
DISCLAIMER: I am not an electrical engineer, only a hobbyist. My explanation falls under the "Good enough" category and I'll probably get some specifics wrong. Modern computers are built around the idea that there is a ground. The PSU housing is wired to ground, the case is connected to the PSU housing (via metal screws) and is therefore grounded, and the motherboard is screwed into the case with the screws being hooked up to the ground plane on the board, therefore grounding the motherboard. Basically, everything is connected to ground. When no ground is connected, everything in the ground would just build up electrons that were designed to flow through ground. When you touch it, you become that ground and they flow through you, and since it's constantly building up electricity, it feels pretty consistent. My explanation is probably off in some respects, but if the ground is bad, it will shock you.
It's typical to experience electrical sensations without grounding. I assumed grounding existed for emergency situations if a large current flowed (like from a failed PSU). I wasn't aware that a PC generates electricity as it moves through its parts, which is why it accumulates inside the case. Thanks for the info!
It's normal to sense a current when the earthing isn't properly installed. Earthing isn't meant for emergencies; it provides AC that flows through you, though only a small amount. RONOTHAN## has a good point. The main power supply typically includes noise suppressor capacitors from the two wires connected to earth. This setup varies by country, but in this region, any metal enclosure needs an earth wire unless it's double-insulated.
Verify if your motherboard is making contact with the case, particularly on the underside, and ensure all standoffs are placed properly. I’m 99% confident it’s correct—except for the ground wire that should be in your case. Is your case equipped with a ground wire? Any signs of this issue?