c/electronics-repairers

22

jakeb81•15d ago

PSA: That $20 ultrasonic cleaner from Harbor Freight actually works for cleaning circuit boards

I was sure it was junk when I saw the price tag, figured it couldn't even shake a loose screw. Last month a customer brought in a water-damaged laptop from a flood in New Orleans, and I threw the motherboard in there with some 99% isopropyl for 3 cycles. Cleaned off all the crud better than my cotton swabs and toothbrush ever did, and the board fired right up afterwards. Anyone else have a cheap tool that surprised them?

6

samk77•17d ago

Three weeks of nothing but coffee maker repairs...

I swear every single job that came through the door last Tuesday was a Keurig or a Mr. Coffee with the same damn pump problem. Anyone else get stuck in a weird streak like that where it's the same failure over and over?

18

reese_lee9•1mo ago

Had a power supply go up in smoke at a repair shop in Denver last month

I was working on this old stereo receiver at my buddy's shop in Denver when the power supply just let go. Sparked real bad and smelled like burnt plastic for hours after. Turns out the filter caps were way past their rated life and one blew short. Now I always check the date codes on electrolytic caps before even plugging anything in. Anybody else had a unit surprise them like that?

9

jana881•1mo ago

That capacitor order from Digi-Key that sat in my mailbox for 4 days in July

I was working on a dead power supply in my garage in Phoenix last July and needed 3 specific 220uF caps. They sat in my mailbox for 4 days because I forgot to check tracking and the heat fried the electrolyte inside. Has anyone else had components die just from sitting in extreme temps before you even touched them?

30

pat_stone•1mo ago

Just learned that most HDMI cables over 15 feet don't actually support 4K HDR properly

I was swapping out a projector in a conference room last Tuesday and couldn't get a stable signal past 12 feet. Checked the specs on a few 25-foot cables I had and turns out they max out at 18Gbps, not the 48Gbps needed for full 4K HDR. Has anyone else run into this issue with long runs or found a solid workaround besides active cables?

3

ben_lewis•1mo ago

Stop using isopropyl alcohol on thermal paste jobs

I keep seeing people spray IPA directly on boards when swapping thermal paste. That stuff can seep under sockets and cause corrosion over time. Just use a lint free cloth and some gentle pressure, you don't need to drench it.

15

angelarivera•1mo ago

Rant: Stop using compressed air to clean game consoles

I was at a retro game store last weekend watching the kid behind the counter blow dust out of an NES with canned air. All that did was push the dirt deeper into the power switch and RF box. I had to show him how to actually take the shell off and use a soft brush and isopropyl alcohol to get it clean. Has anyone else had to fix a console that someone ruined by just blasting air into it?

15

ivan774•1mo ago

Just got burned on a cheap soldering station from an online store

Spent $45 on a no-name soldering station that crapped out after 3 weeks with a dead heating element, so has anyone else had better luck with the Hakko clones on Amazon?

12

the_drew•1mo ago

Just wasted 4 hours on a power supply diagnosis that was totally obvious

I spent all afternoon chasing a weird ripple on a monitor supply, replacing caps and checking diodes, only to find a cracked solder joint on the main transformer pin. Anyone else start with the complicated stuff before checking the simple things first?

27

sanchez.mary•1mo ago

That heat gun shortcut young techs keep using on old boards

I noticed the newer guys in my shop keep using high heat on circuit boards to speed things up. They crank the gun to 800 degrees and wonder why the traces lift right off. I have been doing this work for 25 years and I learned the hard way that lower heat and patience save more boards. Just last week a kid ruined a 1980s receiver by rushing a capacitor swap. He melted the solder mask near three joints and the whole trace came loose. Why do so many people think faster heat equals better results?

24

jamesf29•1mo ago

Bought a $300 desoldering station from a random eBay seller, lasted 2 weeks before the pump died.

The thing was pulling a vacuum fine for a few days but then started sounding like a blender full of gravel. Has anyone else had luck with any of those budget Chinese stations or should I just save up for a Hakko?

9

sethfoster•1mo ago

Shoutout to the guy at the e-waste recycling center who let me dig through the bins

I was at the county dump last Tuesday and found six working power supplies and a stack of motherboards with intact capacitors just sitting in a pile of crushed monitors, so if you're burning through components like I am, check your local facility before you spend another $40 on shipping.

26

rileygarcia•1mo ago

Hit a dead end with my multimeter so I grabbed an old analog one from the 70s

Was chasing a capacitor leak on a power supply board last Tuesday and my digital meter kept jumping around. Grabbed a Simpson 260 from my grandpa's old toolbox and found the issue in 2 minutes flat. Has anyone else had better luck with analog meters for weird transient stuff?

12

ward.kim•1mo ago

Just found out that thermal paste has a shelf life and I've been using stuff from 2018

Was cleaning out my drawer and noticed the tube said 'best before 2020' on it. Has anyone else dealt with dried-out paste or am I the only one who never checked the expiration date before?

3

willowg88•1mo ago

Got told my solder joints looked like 'cold spaghetti' and it stung

A senior repair guy at a shop in Portland looked at my motherboard work and said I needed to let the iron sit longer before feeding. I started counting to three on every joint and my failure rate dropped from like 30% to maybe 2%. Anybody else get a piece of criticism that totally changed their technique?

7

gibson.morgan•1mo ago

20 years of fixing stuff before I learned about thermal paste

I used to just glob it on like peanut butter. Then I rebuilt a Dell Optiplex from 2008 last month and the CPU hit 90 degrees. A guy on YouTube showed me the pea method and now my temps dropped 15 degrees. Anyone else have a basic thing they overlooked forever?

11

the_brian•1mo ago

Warning: That $15 Chinese desoldering gun was a total waste

Picked up a cheap desoldering gun off Amazon for about 15 bucks last month. Figured it would help me clear through some old board work faster. First use, the tip clogged up within ten minutes and the suction barely worked. Ended up having to dig out the solder with wick anyway and the whole thing just made a mess. Anyone else tried one of these budget desoldering tools and had the same problem?

11

wyatt135•1mo ago

Pro tip: That guy at the parts counter saved my bacon on a power supply fix

I was hunting for a cap kit for an old Samsung TV last Tuesday and this older technician behind the counter stopped me. He said "you're wasting your time, the real issue is the cold solder joints on the main IC, not the caps." I almost ignored him but figured I had nothing to lose. After I reflowed those joints the TV fired right up. Has anyone else had a parts guy drop knowledge that saved you hours of chasing the wrong fix?

26

price.ben•1mo ago

Spent $80 on a capacitor tester that was just a multimeter with a sticker

Bought it off a Facebook ad from some guy in Ohio, and when I cracked it open to see why it wouldn't read anything, the board was identical to a $20 meter I already had. Has anyone else fallen for one of these rebranded scams?

29

patricia262•1mo ago

I think we're too quick to write off older diagnostic gear

Last week, I was working on a 2012 iMac with a weird power cycling issue. Everyone at the shop said to just hook it up to the new $5000 analyzer and let it run the full suite. I mean, I get it, it's fast. But I pulled out my old Fluke 87V from like 8 years ago and started checking the board voltages manually. Took me maybe 20 minutes, but I found a tiny voltage drop on a specific power rail that the new machine's auto-test just flagged as 'within spec'. It was a bad cap hiding in plain sight. I feel like we rely on the fancy gear to think for us sometimes, and we lose the skill of actually following the circuit. Has anyone else found a case where the old hands-on method caught something the new box missed?

12

jamief67•1mo ago

Can we talk about the 'just replace the board' mentality?

Three years ago at a shop in Phoenix, a guy told me to toss a whole laptop over a $2 capacitor. I still fix that model regularly with a 30-second solder job. How many good boards get trashed because people won't diagnose?

4

christopherw34•1mo ago

I spent $400 on a thermal camera for board repair and it feels like a waste.

I bought it thinking it would be the magic bullet for finding shorts on modern, dense boards, but half the time the hot spot is under a shield or the temp difference is too subtle to see clearly. It just sits in my drawer while I go back to my old method of checking voltages and injecting current. Am I using it wrong, or is the hype around these things overblown for general repair work?

14

murphy.tessa•2mo ago

A talk with my neighbor's kid about fixing his old game console made me see my job differently

I was helping the 14 year old next door with his busted PS3, the one with the yellow light. He was watching me take it apart and said, 'It's cool you can bring something back from the dead.' I told him it's just replacing bad capacitors, but he kept asking why they go bad in the first place. I gave my usual spiel about heat and cheap parts, but then he asked, 'So if they knew it would break, why didn't they make it right the first time?' That simple question stuck with me for days. I've been fixing the same models for ten years, just swapping parts, but I never really stopped to think about the planned failure built into so many things we fix. It changed how I talk to customers now. I explain not just the fix, but why it likely broke. Has anyone else had a moment that made you explain the 'why' behind the repair, not just the 'how'?

33

mark_ward•2mo ago

Showerthought: I was replacing a whole power supply board for years when it was just one bad cap

I was working on an old Vizio TV from 2015 that kept shutting off. For three years, I'd just swap the entire main board, costing the customer about $80 each time. Yesterday, I saw a tiny bulge on a single 1000uF capacitor near the voltage regulator. Replaced just that 50 cent part and the set fired right up. I felt like a total idiot for not checking the basics first. How many other simple fixes have I been overcomplicating?

2

emery290•2mo ago

I finally understood why my old boss in Tampa always insisted on cleaning flux with a toothbrush

Last month, I was fixing a vintage receiver and saw how the leftover residue was causing a slow short under a chip. Has anyone found a better tool for getting into those tight spots on old boards?