Had a chat with an old TV repair guy that made me rethink my whole approach

Met this guy at a swap meet last Saturday, must have been 70 something. He was selling old CRT parts and we got to talking. I was bragging about my fancy hot air station and how I can swap out BGA chips no problem. He just looked at me and said "you fix with your eyes, I fix with my ears." At first I thought it was just old man talk. But then I got home and had a power supply that was buzzing real faint. I was about to start pulling caps and measuring everything. Instead I just sat there and listened for like 5 minutes. Heard the faintest whine from a transformer. Found a cracked solder joint on its pin that I would have missed visually for hours. Made me wonder how much time I waste looking for problems I could hear first. Any of you guys still troubleshoot by sound or am I just late to the party?

3 comments

3 Comments

kim6931mo ago

That line about fixing with your ears instead of your eyes hit me hard. I had a monitor once that would randomly shut off after an hour, and after swapping half the caps I finally just sat there and listened. Heard a tiny crackling from the flyback transformer, turned out the coating had a hairline crack arcing to the core. Saved me like three more hours of shotgun troubleshooting. Pro tip: get yourself a mechanic's stethoscope with the metal rod, it turns the whole board into a listening device and you can pinpoint exactly where the noise is coming from.

evan_wilson1821d ago

Isnt that just how everything works now though? You beat your head against the obvious fix for hours then suddenly remember the old school trick your grandpa showed you and bam it's fixed in 5 minutes. Ive started doing the same thing with my car when i get a weird noise. First instinct is to start pulling things apart and swapping parts but if i just drive it slow and listen real hard for a block or two i can usually tell if its a wheel bearing grinding or a pulley chirping before i even pop the hood. Feels like we get so focused on what we can see and replace that we forget the simplest clues are right there in the sounds things make.

grace_allen1mo ago

Wait, are we really acting like this is some kind of ancient wizardry now? I mean yeah, listening is a good trick when you've already gone down the rabbit hole, but let's not pretend it's a substitute for knowing what you're doing. I've had plenty of stuff crackle and pop that was just a loose connector or a bad solder joint, not some flyback transformer conspiracy. Honestly, half the time the noise is just your own blood pressure rising from frustration.