c/electronics-repairers

Tried hot-air rework on a stubborn HDMI port, ended up melting a nearby capacitor

I was fixing a PS4 with a loose HDMI port last night, figured I'd use hot air at 350C for 10 seconds to remove it. Problem is, I didn't mask off a row of tiny capacitors near the port, and one of them just popped off the board. Has anyone else ruined a board component doing this and found a good way to protect those small parts?

Got a JVC VCR from 1985 that put up a real fight today

Picked up a JVC HR-D140U off Facebook Marketplace for $20 last week. The owner said it just needed a belt. Took me three hours of cussing in my shop to figure out the loading mechanism was cracked - someone jammed a tape in wrong back in the 90s I guess. Anyone else run into these old JVCs where the plastic gears just crumble on you?

Tried hot air rework on a corroded laptop board and it backfired badly

Ngl, I thought hot air would be faster than scrubbing with alcohol on a corroded HP laptop I got from a pawn shop in Austin. I set it to 350C and blasted the corrosion near the charging IC, but the flux and junk just melted deeper into the board and shorted three traces. Learned the hard way that patience with a fiberglass pen and isopropyl beats heat every time for corrosion. Has anyone else found hot air making corrosion worse instead of better?

Found a bad capacitor on a 10 year old Samsung TV by just listening for the buzz

My neighbor was about to toss a 55 inch Samsung from 2014 because it wouldn't turn on, so I took the back off, heard a faint high pitched whine near the power supply, replaced three swollen capacitors for $3.50 total at a surplus store in Akron, and it fired right up has anyone else had luck tracking down issues by sound alone?

TIL a dead capacitor can look perfectly fine

Spent 3 hours chasing a no-power issue on a Samsung TV last Wednesday, checked every fuse and voltage rail twice. Finally pulled the power board and tested a capacitor that looked brand new no bulging or leaking, but it read 0 capacitance on my meter. Anyone else ever get burned by a component that looked good but was totally dead?

TIL I was cleaning flux residue wrong for 6 years

A guy at a local repair meetup in Austin told me I was using too much isopropyl alcohol on my boards. I always just drowned them in 91% and called it done. He said I was probably leaving a film that traps moisture over time. Switched to a 50/50 mix with distilled water and a soft brush, and now my boards actually look clean instead of streaky. Has anyone else had better luck with a specific ratio?

Had a customer last week tell me I should just replace boards instead of fixing them

He said it's cheaper and faster to swap a whole power supply board than to spend 45 minutes tracking down a bad cap, and now I'm wondering if I'm being stubborn about component-level repair when most people just want their stuff working again. Has anyone else had this debate with a client and changed their mind?

Hit 10 years fixing boards and just found out I was using flux wrong the whole time

I was working on a old amplifier from the 80s last month, one of those silver-faced Pioneers a guy brought in. I always just globbed on flux paste from that little tin I got at a swap meet, figured more was better to get the solder flowing. This thing had cold joints everywhere after I worked on it, and I couldn't figure out why until a buddy stopped by my shop in Portland. He watched me for like 2 minutes and said "dude, you're using acid flux on circuit boards, that's for pipes." I felt like a total idiot. Been using rosin core solder forever but somehow never realized the paste I had was completely wrong. The worst part is I probably ruined a dozen other repairs over the years doing this. Anybody else ever get caught using the wrong flux for years without noticing?

Tried a cheap hot air station vs my old Weller iron for a stubborn HDMI port

I spent 20 minutes fighting a bad HDMI port on a PS4 with my standard iron, desoldering braid, and a lot of swearing. Finally dug out a $35 hot air station I bought on a whim, and the job took under 5 minutes with way less board damage. Anyone else find hot air is way better for these multi-pin connectors, or do you stick with iron and flux?

Why does nobody talk about that tiny capacitor on Pioneer amp boards

I spent 3 hours yesterday chasing a dead channel on a Pioneer SA-8800 at my bench in Houston, swapping everything I could think of. Turned out it was a single 10uf cap that looked fine but read open on my meter. Has anyone else wasted a whole afternoon on one stupid part that looked perfect?

Customer told me my cap replacement looked sloppy... he was right.

TIL cheap desoldering pumps are actually fine for most jobs

I spent $80 on a fancy desoldering station a year ago and honestly, my $12 hand pump from the hardware store does the same thing 90% of the time. Has anyone else found a tool that's hyped up but not really worth the upgrade?

Found out most repair shops just toss old capacitors instead of testing them with an ESR meter

I read a breakdown on a supply house blog that said 70% of shops don't bother testing caps before replacing them, they just shotgun everything. Why even own an ESR meter if you're not gonna use it to save time and parts?

Walked into a mom-and-pop repair shop in Fresno last weekend and got an earful

The guy running it told me he refuses to work on anything made after 2015 because the chips are too hard to source. Said he's sitting on a pile of dead Samsung TVs nobody can fix. Is that really where we're headed that older gear is the only stuff worth touching?

Guy swore solder paste was good enough for through-hole jobs

Had a dude on here tell me to stop using regular solder for through-hole repairs and just use paste with a hot air gun. Said it was faster and stronger. Tried it on a power supply board last Tuesday. three joints looked fine but one never wetted right and cracked after 20 minutes of runtime. Had to redo the whole thing with my iron and got it done right on the second try. Anyone else get bad advice from these forums that cost them time or parts?

Caught a motherboard rotting from the inside out on a routine check

Had a customer bring in a 3 year old laptop that was acting flaky... decided to open it up even though they said nothing spilled on it. The copper traces near the USB port were literally turning green and flaking off, all because of some cheap flux residue the factory never cleaned. I've seen this get worse over just 6 months in humid basements, but this one was in a normal office. Anybody else noticing boards from certain years turning into corroded messes faster than they should?

Tried using a hot air rework station on an old motherboard and melted a capacitor next to the chip

I was trying to remove a BIOS chip from a Dell OptiPlex 790 board to flash it for a repair. Set the temp to 350c and aimed the nozzle at the chip, but the cap right next to it just bubbled and popped off. Learned the hard way that Kapton tape is not optional for tight spaces. Anyone else have a close call with hot air damaging nearby parts?

Debate with a vintage radio guy made me question my whole approach to repairs

I was at a swap meet in Portland last weekend and got into it with a guy who restores old tube radios. He said if I can't trace the circuit with my own eyes and a multimeter before touching anything, I'm just guessing. That hit different because I've been doing board swaps on modern gear for years without really understanding the flow. Part of me thinks modular replacement is fine for speed, but the other part wonders if I'm losing the skill of actual diagnosis. Where do you all draw the line between efficiency and knowing the circuit inside out?

Why does every beginner think they can fix a power supply with just a multimeter?

I swear I see it at least twice a week where someone comes in with a blown power supply and they think poking around with a multimeter is all they need. I had a guy last Tuesday in my shop who spent two hours testing voltages on a dead SMPS and then got surprised when it still didn't work. Dude, you need an oscilloscope to catch that ripple noise and switching spikes, that's just basic stuff. I've been repairing these things for 12 years and half the time a cap looks fine but it's dried out inside causing all kinds of problems. A multimeter won't show you a failing cap under load, you need an ESR meter or a scope for that. Has anyone else seen this trend where people skip the proper gear and wonder why their repairs fail after a week?

Discovered my $20 soldering iron was actually better than the $150 station I bought later

Picked up a cheap Weller pencil from a pawn shop last year for $20, just as a backup. Used it for a motherboard repair yesterday and it flowed solder smoother than my fancy Hakko station. The tip actually held temp without bouncing around. Guess sometimes the old stuff just works better. Anyone else find their junk drawer tools outperform the high end gear?

PSA: Don't trust cheap thermal paste from Amazon bundles

I ordered a $12 repair kit off Amazon last month that came with a syringe of thermal paste. Figured it was fine for an old laptop I was reviving. After the CPU hit 95C under load and started throttling, I repasted with some Arctic Silver I had from 2019. Drop went to 72C. That cheap stuff was basically grease. Lesson learned: never use mystery paste from a random kit. Anyone else get burned by these bundle deals?

Guy at my shop swore by compressed air for cleaning motherboards, then blew a capacitor right off the board

I was helping a buddy troubleshoot a dead power supply last Tuesday and this older repair guy walks over, says "just blast it with air" and aims a 100 PSI nozzle at a 15 year old motherboard. Dust went everywhere, but so did a tiny capacitor that pinged off the wall. Has anyone else had a repair go sideways because someone was too aggressive with cleaning tools?

Pro tip: I swapped my cheap solder sucker for a real desoldering station last week

I kept fighting with that $12 plunger-style solder sucker on a vintage stereo board, burning pads and ripping traces. Picked up a Hakko FR-301 used off eBay for $180 and finished the job in half the time with zero damage. Has anyone else made the jump to a powered desoldering tool and regretted waiting so long?

Just realized I've been using the wrong iron tip for years

I was working on this old Pioneer receiver from the 70s last week, trying to desolder some caps on a crowded board. After 20 minutes of frustration, a buddy stopped by and asked why I was using a chisel tip for precision work. Told me to switch to a fine conical tip and suddenly the solder flowed like butter on those tight joints. Anyone else have a moment where a simple tool swap made you feel like an idiot for not trying it sooner?

TIL flux residue can fry a board even if it looks clean

I used to skip cleaning flux off after soldering if it looked fine. Last week a laptop board came back dead after 3 months and a microscope showed a crusty patch I missed. Has anyone else gotten burned by no-clean flux acting up later?