Wasted a whole weekend on a bad power supply tester

So I picked up this cheap power supply tester off Amazon for like 25 bucks, thinking it would save me time on diagnostics. Used it on a weird PC that kept shutting down, and it gave me a clean bill of health on the PSU. Spent the next two days chasing down motherboard and RAM issues, swapping parts, the whole nine yards. Finally, out of pure frustration, I plugged in a known good PSU from my bench and the system booted right up. That cheap tester totally lied. Lost basically my whole Saturday and Sunday on a wild goose chase. Now I just use the paperclip trick and a multimeter for a quick check, and keep a known good unit for real testing. Anyone got a PSU tester they actually trust that won't break the bank?

3 comments

3 Comments

riley582mo ago

Man that is the absolute worst feeling. I've been burned by those cheap testers too, they just check for voltage presence not if it can actually deliver stable power under load. Your method is the right way to go, the paperclip and multimeter check never lies. It's frustrating how much time a bad tool can waste.

gavincraig2mo ago

My buddy Mark spent three days swapping parts in his old gaming rig. Kept getting random shutdowns. His cheap PSU tester showed green lights every time. Finally did the paperclip trick and his 12V rail was dipping to 9 volts under load. That tester went straight in the trash.

reese5511mo ago

That sucks man, I know exactly how you feel. @gavincraig had the same thing happen to his buddy Mark, and it's just a bad scene all around. Those cheap testers are basically toys, they only check if there's power coming out at all not if it's stable. You can get a green light on a rail that's already dying and that's what wastes your whole weekend. A multimeter and the paperclip trick is way more reliable and it never lies about ripple or voltage under load. I'd rather spend 20 bucks on a decent multimeter than another 25 on a plastic box that's just gonna give me false hope. Lesson learned the hard way but at least you're not alone in getting burned by it.