The Art Of Methodical Fault Finding - A Practical Example
ฝัง
- เผยแพร่เมื่อ 3 มิ.ย. 2024
- In this video we look at some Fault Finding Diagnosis methods, plus we have a practical example of how to diagnose and repair circuits when you have very little information about the circuit function and can't find any datasheets for the components
CHAPTERS
00:00:00 The Art Of Electronics Repair
00:10:35 The Victim
00:14:11 Preliminary Enquiries
00:16:44 Reverse Engineering
00:37:16 Forensics
00:37:19 Sherlock
01:00:42 Case Solved
01:07:41 Debriefing
I work in collaboration with:
The Electronics Channel (live streams with Carlos and Detlef)
/ @theelectronicschannel
Gran Canaria Uncovered
/ @grancanariauncovered (with Detlef and Julie. Not electronics related)
Det Builds Stuff - / @detbuildsstuff8128 (Detlef)
Retro Upgrade - / @retroupgrade (Carlos)
For All Your PCB needs: free $5 discount coupon
www.pcbway.com/setinvite.aspx...
Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission.
TEST METERS
Aneng AN8009
s.click.aliexpress.com/e/_DdW...
amzn.to/469ZgOS
www.banggood.com/custlink/mD3...
KM601
s.click.aliexpress.com/e/_DBw...
www.banggood.com/custlink/KD3...
VC480C+
s.click.aliexpress.com/e/_DEY...
amzn.to/3Q3LEz7
amzn.to/46tmNdo
MESR-100 ESR METER
amzn.to/3tiy8hK
amzn.to/3RwvejK
s.click.aliexpress.com/e/_Dmi...
XC6013L CAPACITOR METER
s.click.aliexpress.com/e/_DmX...
amzn.to/3t71Nul
amzn.to/3LDdcbO
TM-902C TEMPERATURE METER
s.click.aliexpress.com/e/_Dm9...
amzn.to/3LFzERv
amzn.to/3PTwuvW
LCR-T4 LOW COST COMPONENT ANALYZER
s.click.aliexpress.com/e/_Dmq...
www.banggood.com/custlink/KKK...
amzn.to/46uzV1R
amzn.to/3RHsmAN
FNB58 USB ANALYZER
s.click.aliexpress.com/e/_Dmd...
amzn.to/3tb1QW8
amzn.to/46oMn30
www.banggood.com/custlink/mKm...
PCI POST ANALYZER
s.click.aliexpress.com/e/_DBs...
amzn.to/46m9Gep
TL460S Plus PCI_E ANALYZER
s.click.aliexpress.com/e/_DnB...
amzn.to/3ZERvOs
TOOLTOP ET829 SCOPE METER
s.click.aliexpress.com/e/_DBw...
www.banggood.com/custlink/KGv...
MULTIMETER PROBE KIT KET05
s.click.aliexpress.com/e/_DE7...
OSCILLOSCOPES
FNIRSI 1014D
s.click.aliexpress.com/e/_DEz...
amzn.to/3RxMFk1
www.banggood.com/custlink/KKG...
FNIRSI DSO-TC3
s.click.aliexpress.com/e/_DC8...
amzn.to/3RBsgdS
www.banggood.com/custlink/Gm3...
FNIRSI DPOX180H
s.click.aliexpress.com/e/_DBX...
amzn.to/468oooT
www.banggood.com/custlink/GGG...
BENCH PSU
NPS3010W
s.click.aliexpress.com/e/_DDP...
amzn.to/3rxsuIf
www.banggood.com/custlink/3DD...
SOLDERING
T12 Station with M8 9501 Handle
s.click.aliexpress.com/e/_DFV...
amzn.to/3FdG8Ul
M8 9501 HANDLE
s.click.aliexpress.com/e/_De0...
T12-BC3 Tip
s.click.aliexpress.com/e/_DeN...
amzn.to/3EUFpqQ
amzn.to/3PB8axw
SUGON T26D
s.click.aliexpress.com/e/_DFx...
QUICK 861DW
s.click.aliexpress.com/e/_DDo...
amzn.to/3PBOKZH
amzn.to/3RCSqNh
PROS'KIT SS-331H
s.click.aliexpress.com/e/_DDo...
SS-331H Spare Parts
www.aliexpress.com/item/40002...
THERMAL CAMERA
Infiray P2 Pro
s.click.aliexpress.com/e/_Dmu...
amzn.to/457PgEb
www.banggood.com/custlink/DDG...
MICROSCOPES
Amscope Optical Microscope (copy)
s.click.aliexpress.com/e/_Dlh...
uk.banggood.com/custlink/mKGy...
amzn.to/4675Qp0
amzn.to/459uvrY
ANDONSTAR AD407
s.click.aliexpress.com/e/_Dl4...
amzn.to/3PSQKxJ
amzn.to/48sxej4
EEPROM Programming
TL866 II+
s.click.aliexpress.com/e/_Dls...
amzn.to/3RTCRB9
amzn.to/3LDu3Lu
CH341A
s.click.aliexpress.com/e/_Dk0...
amzn.to/48IZiir
1.8V ADAPTER
s.click.aliexpress.com/e/_Dci...
CONSUMABLES
NC-559-ASM FLUX
s.click.aliexpress.com/e/_Dda...
DESOLDER BRAID (I use size 8045)
s.click.aliexpress.com/e/_Dl5...
s.click.aliexpress.com/e/_DFJ...
MECHANIC HX-T100 Solder 63:37 (I use 0.6mm)
s.click.aliexpress.com/e/_DeZ...
ESD-11 TWEEZERS
s.click.aliexpress.com/e/_DCZ...
amzn.to/3PVfO7e
Learn Electronics Repair is now on Discord! Come and join the fun, it's free.
/ discord
If you would like to support this channel
You can send donations
www.paypal.com/paypalme/youtu...
You can subscribe to Patreon
/ learnelectronicsrepair
You can click Join to become a channel member
Thank you
Richard
*IMPORTANT NOTE* At 51:12 I drew the collector of the transistor connecting to the wrong end of the 10K resistor.
How the hell did you pass your exams 🤦♂🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣👌👍
@@paulc9139 With distinctions funnily enough LOL
@@LearnElectronicsRepair Good
phew! I was thinking this would be a better place for base control. Thanks for clarifying.
@@jonnafry Yeah, where I drew it would mean that the transistor turning would attempt to short out the Vcc to the chip. As this is supplied via a 470R resistor to a zener it would not damage the transistor but cutting power to the chip would turn the transistor off again. Maybe it would oscillate.
Sometimes when reverse engineering it is easy to make this sort of mistake - you either realise it is wrong, or you imagine the circuit working as you expected it to.
If you're new here and interested in electronics repair, save this video to your playlist. Absolute gold!
Thank you!
I save all this trouble shooting videos, and yes THEY ARE GOLD.. PURE GOLD MY FRIEND.👍🇮🇪
💡 definitely a must! Good call ✊
A note on the Intro. There is a book called a mind for numbers. It describes the 4 am solution process. For solving problems, your brain has 2 modes, focused and diffused. In short for math/logic problems you should spend 15 min at 100% focus trying to solve the problem. Then you should do some task that has a low mental effort e.g walk, sleep, bath. Your subconscious continues to work the problem. In this "diffused mode" some solution or progress will come to you. This harkens back to Archimedes and the Eureka moment if you read that story it will make sense. P.S great video!
Thanks ive added the book to my Xmas list from the mrs 😂
@@andrewtucker6325well, don't leave us hanging, did you get it as a present? 😉
Fantastic vid. Problem solving is such a satisfying thing. It worked for me when I worked for Dyno Rod. It worked for me when I was a handyman. I am like you, 4am waking up with a solution to a problem that had bugged me the day before. I am not an electronics engineer, rather more an enthusiast. I have learned a huge amount of knowledge and have fixed endless items of electrical gear as well as a few electronic pieces. Hooray for guys like you who rather than keep your hard earned experience to yourself, choose to let us into the mystical world of mending electronic stuff via You Tube. . My appreciation and muchos gracias to you.
Very nicely said.
Oh goodness me, you've just described me, in when I did my apprenticeship In TV/Radio/Electronic repairs in the 70's very exciting times, College taught me the science of it, my allotted engineer taught me the how to do & expanded my mind to the voodoo of it, then one day it clicked, the voodoo was installed in my mind, that night I wrote down what I thought the problem on a TV we were working on, and showed it to Andy the engineer mentor in the morning,both our notes were the same, I was right YES, this week for instance I was given a lovely multifunction power supply, which the magic smoked from a regulator, so changed the reg, then I proceeded as to why the reg blew out, in my discovery I found 2 electrolytics with 4 & 6 ohm ESR plus a diode that went shorted a change instead of open, which I think was the problem along with the caps, May the Force stay with you.
When I was an electronics engineer doing bench repair of industrial instrumentation and control electronics down to component level in the mid 1990s, I learned more about practical fault-finding and electronics in the first few months than I ever did in years as a hobbyist, student and engineer previously.
It was my personal ''Cambrian Explosion'' of my evolution as an electronics engineer that lasted about 18 months, but it advanced my knowledge and experience greatly.
This is why Dave @ EEVBlog says he hopes when you witch your electronics project on that nothing happens. 😊
It does in fact is a skill to fix more complicated faults. What I would do in similar situation would be: Check if in fact the charger is dead. Never trust in user report.
Only trying to repair broken products on your own will teach you how to fault-find. Watching videos like this can help you get ideas of what to look for. But in the end, practice, practice, practice, will get you ahead.
Yes, this is exactly what I was trying to say
I'm 46 and been in industrial manufacturing for 8 years doing electrical there and learned in the job. I left last year to go back to school to get the basics to better understand what to expect when I'm troubleshooting. I'm now going back to work but have finals next week first. It was really nice to watch this and understand everything you are saying as you go along this process. I wouldn't have been able to follow this a year ago.
You can learn to understand circuits and components but the discipline to find the root issues take practice and overcoming lots of failures or unknowns. Thank you for this video.
Intuition is often referred to as a "gut feeling", but really it is our subconscious mind piecing together the puzzles (of which we are consciously focused on) in the background (unconsciously). The processing power of our conscious mind pales in comparison to our million times faster subconscious processor. Everyone has an intuitive cognitive function, but the degree of strength in intuition varies due to personality type, because the our cognitive function order (strongest to weakest) is what discerns the differences in personality type.
For instance; a person with a dominant cognitive function in intuition and secondary function in thinking, will have much more than a "gut feeling" (more like a knowing) compared to a personality type with dominant feeling and secondary sensing. Every type has their cognitive strengths and weaknesses, but when it comes to pattern seeking, deep analysis, seeing how things are interconnected, nuances, coming up with novel ideas, problem solving, can understand complex concepts...... dominant intuition and thinking (either order) are by far the best at these tasks.
I'm pretty sure Richard is an INTP personality type (same as Einstein) with dominant introvert thinking and secondary extroverted intuition. I'm not surprised why he is so good at the art of electronics.
Hey, I didn't know what INTP was, but now I looked it up that is pretty much me explained. I didn't realise I had been defined, measured and catalogued LOL.
Probably the only way I differ from that description of INTP is I am a bit more extrovert (I was a mobile DJ in the 70s/80s and again in the mid 2010s for example). The bit about disliking authority, especially when they are trying to enforce what I consider to be stupid illogical rules, and disliking blatant hypocrisy especially in politicians are exactly me.
The 4AM stroke of genius is what I call "putting an idea in the back of my head". I see the problem and leave my brain to solve it. If I have the knowledge, thinking about the problem is - more often than not - a waste of time. At the very least, something I've consciously put my attention to is going to be warped by the thousand other little things I'm trying to process in a normal day.
I've discovered (just now, thanks to your comment) I'm sort of an INTP myself, minus the overthinking/analysis-paralysis part and the "priding myself" - I thought getting lost in thoughts was nothing to brag about. Then one day I found out that creative thinking is NOT the default and I went like "what? You mean there are people out there who don't know what they're doing until they've done it?" :D
Richard, I've watched electronc repair video's for the last 3 years, it's all voodo black magic!! However I am learning it in my head and fitng things together to make a picture. It's something I'll take up maybe or not at all when I retire. In the meantime what you said about assembly programming, yes, yes, yes you are spot on!! It is an Art, I've been telling people this for years! I only did it as a hobby, but spent 4 years doing it. I have only just gone back to programmming/Scripting in the last 2 years and what I learned all those years ago and my way of learning it helped me ick it back up really eaily!! It was nice to actully hear someone saying what I said; and prove to me mentally I was right! Thanks mate ;-)
none of this made sense to me until you drew the schematic. Thanks!
I really appreciate the methodical way you went through and figured out how the circuit works. That's obviously something that takes time to become good at. I'm nowhere near that level yet, but at least I was able to follow along with you and it all made sense. I will have to troubleshoot a lot more circuits before I can sight read the values of resistors and know which pins are BCE for the transistors, but I'm sure I'll get there eventually. In a previous life I was a software engineer and so of course I took a good amount of EE classes including a couple upper division (it's been 25 years since I got my BS in CompSci). I always liked the EE classes and my favorite software classes were the ones where we coded in assembly. I much preferred managing the parameters in and out of a subroutine on the stack in 80x86 asm than I did designing data structures using virtual classes. Thinking about the latter still gives nightmares. It wasn't that i couldn't do it but it just didn't come to me as easily as the low level stuff. I worked with some brilliant software developers in my career that could design amazing objects that not only did the job but were so sophisticated with elegant interfaces. Whereas if I were to design the same thing it would probably get the job done (eventually) but it would look like a crazy person built it with scrap parts and things patched together in a convoluted way with some paths that lead nowhere. And my interfaces were clunky and incoherent so if you weren't careful you could easily break something. But those same class masters would be triggered even saying the word "opcode" or "register" and I could do some similarly sophisticated and elegant things in assembly. It's a shame that I went straight out of college to a 14 year career with a company that was mostly doing C++ programming. I did get to do some asm stuff early on but that's when our product only ran on PCs running DOS and the existing engine, although written mostly in C, had some asm subroutines and there were cases where we had to do new stuff in asm for speed reasons. But even in those early days the groundwork to move our code to a platform neutral model based in C++ and eventually ported to upwards of 13 different CPU/OSs , so we quickly abandoned writing any platform specific asm code. And don't even get my started on the nightmare that was to come of that "new" C++ code base. We really should have built the new system from the ground up but the paper pushers didn't want to give us the time and resources that would require. They reckoned that we already had something that worked (for the fading past) and we couldn't afford to just scrap it, so we had no choice but to use it as the base to build that scaffolding that was to support the next 20 years of who knows what. Supporting that code base on all those platforms was a nightmare. I've gotten way way off topic and I better stop before my blood pressure spikes.
Where was I now... Oh yes, looking back I wish I had gone the EE route and I probably would have enjoyed my professional life a lot more and not have burnt out so quickly. As it was I ran away from my well paying corporate software engineer job and had no idea what I wanted to do. I existed off my severance, which was quite generous, for a couple years living cheaply. But I had earned it after all the 60+ hour work weeks (salaried, of course) where it was always "not a good time to take a vacation right now". I had maxed out my PTO and was simply loosing it because my company was shitty like that. Had I been receiving cash payouts for those accumulated days off I might have stuck around longer. Anyway I eventually started an IT business and did that for about 11 years but I never really liked that either. I was always good at troubleshooting and fixing computers so it was a natural option. This is why I understand how you can't teach what you are doing. People would always ask me how to teach them and I would tell them I can't. I wouldn't even know where to begin, because I have no idea how I do it. I've just been hacking computers since I was 10 years old. I started on a TRS-80 with BASIC and a cassette drive, but we eventually got a low density 5.25" floppy. A couple years later the family upgraded to an 80x86 PC and a couple years after that I got my first 386! Every computer I got after that I built myself. When I am troubleshooting some sort of problem I just intuitively know where to start looking and even if I'm working with hardware or software or a system I've never used before I know the fundamentals and design commonalities that most of them follow that I can figure my way out and get up to speed relatively quickly. If they insist I tell them there's no way I can teach you to do what I do because it took me 40 years to learn it. It's just something that comes natural without thinking too much because I've done it my entire life, like waking or riding a bike.
To wrap this epic up, I have since closed the IT business recently to focus on fixing vintage HiFi equipment to make a living. It started out as hobby because 10 years ago I moved to Hawaii and I didn't bring anything with me. Eventually I got tired of using shitty Bluetooth speakers and since I couldn't afford to ship my beefy Cerwin Vega loudspeakers and Yamaha amp that I still had stored at my parents house (I kept a few of my nicer possessions stored there and sold the rest when I moved) I went to Craigslist to see what I could get cheaply. I picked up a simple vintage stack of Technics gear that came with a non-working tape deck. I hadn't listened to tapes in a long time but I thought I might as well see if I can fix it just so I can use it every once in a while. Having never repaired anything at the circuit board level (besides debugging my designs for EE classes on breadboards all those years ago) it was a bit daunting like going into the jungle for the first time, and the wiring being like vines completed the metaphor. lol. I had remembered the basics of electronic components from my college EE classes, like I knew what resistors, capacitors, diodes, transistors, and even logic gates and such did on their own, but I wouldn't say I had a great wealth of knowledge of circuit design. So I just jumped in with a cheap multi-meter and no other instruction (TH-cam didn't have many channels like yours back then and I didn't really became a regular user of the platform for at least a few years after that point) and went at it the same way I would when I troubleshoot a PC. Magically I pretty quickly found some bad electrolytic caps on one of the boards (I had no idea that they were such a common fault in 20+ year old equipment at the time) and without trying to understand the circuit like you did in this video I swapped them out and it worked! I was so pleased with myself and my "new" cassette deck from the 80s that I bought a stack of old cassettes and sought out other old hifi gear to fix. It spiraled from there because I could fix something and then sell it to trade up for a better piece of kit for my system. When I got my first "audiophile" grade gear for almost nothing and was able to fix it I was totally hooked. I went from just wanting a decent stereo to acquiring, fixing, and selling as often as I could. There have been some failures and a lot more dead ends that I intend to go back to because my skills weren't as good at that time. Eventually I got people responding to my ads for sale asking if I could fix there stuff. I hadn't thought of doing that but I said sure I can give it a try...
So that's pretty much the story. I'm not making a ton of money, mostly because I keep too much of the gear, lol, but I'm in demand (and backed up) and I can work from home and people are so happy to have someone that can fix the old receiver that they got from their dad or granddad or they are an old guy that's had it since the 70s and it sat in the garage for the last 20 years. All this to say you got a new subscriber. I'm still learning and one day I hope to be as proficient as you. At one point I knew all the opcodes for the Motorola 68HC11 chip by heart and could read and write machine code in my head (that's a story for another time, but I'll just say RISC architecture is so much more simple so the instructions all follow a simple and well defined pattern) so I know I can eventually get to the point where I can sight read a resistor value! Cheers and Mahalo!
You rock! Please take care of your health in this new wave of covid. The world needs this content to survive the real life RUST server the world is becoming.
A metaphor for explaining the art and voodoo aspect that came to mind was to compare it with learning another language.
You can memorize all the words, but without a basic understanding of grammar you will only understand fragments. As you listen to or speak the language more often you will gain a better understanding of the context. In this context, profanity could be compared to tricks and practicalities....😁
There aren't many videos like yours on TH-cam that focus more on beginners. Like explaining what components do and how they work in basic circuits so for anyone learning there is a massive gap in ways to learn. You can find out what a resistor is on youtube. You can find many ways to make a drone battery, how to turn a phone into a laptop or make a robot dog that can fight a dinosaur ninja... many of those on yuoutube because they look cool and attract many likes but the inbetween is rare. The so called experts dont want to take the time to explain step by step how to test these components in circuit or what they do in the circuit, in detail. So your videos are invaluable to us who really want to learn. Maybe one day I can give a bit back to the world, at no cost, just like you do. It does make a difference, believe me. Somewhere in Africa there is a child who cannot afford to go to college but who's willing to sit down and learn simply because of a love of electronics who might one day build a time machine or a warp drive. A million years ago that kid might have been me but even in my older days i still feel like learning what I've missed out on just for the love of it. Thank you
This guy ey!
Gold! TH-cam has so many gems hidden
You're my internet hero. I've learned so much off you. Thank you! If we ever meet, I'd give you a big hug. We're all watching and learning. Keep up the magical work!!!
This really is an art. It definitely takes time to develop it. Each and every video you're making is definitely developing the proper way to think. Thanks for the videos. 👍
And this is the whole point of no one can teach it but you can learn it - it's about developing a logical way of working that suits the way your brain works.
Big big thumbs up for the assembly comparison. As a former c64/amiga asm coder really can understand it. Assembly programming -just as electronic repairs- needs much more than knowing the basic rules and elements. While trying to resolve a problem in asm we sometimes deleted all our work just at the finish to start over again to try out another solution found while writing the last one. Asm coding was a kinda trial and error method in term of logic of the solution. It was never a problem to write the code for a new logic, the real deal was to always find a better logic/way. That’s how all those audiovisual demo programs were made on computers with several mhz. Now as a game developer (using high lever languages) I feel the need for turn my old amiga on and do some asm coding just for fun. It was the golden age for sure…
I have found that one of the best ways to learn trouble-shooting skills is to breadboard circuits - you are sure to make mistakes along the way. Finding those faults helps me understand the circuits in a hands-on manner rather that just a cerebral way. That is a big difference for me in terms of my learning. I'm a hobbyist, not a pro, but the trouble-shooting skills carry over to my day job as well. Getting hands-on at the component level, is really the only way to learn it. Like the alphabet, you have to learn the letters, then put them together, then you can read and write and take your skill further for years to come. Thanks for your postings, I love seeing the steps you take, the mistakes you make, and the corrections to get things resolved.
Thank you for sharing your knowledge on CCA repair
This is why I like your videos, it's not what you are trying to fix, it's the way you go about finding the problem.
As a hobbyist, all this appeals to me anyway!
The thing is too, there is no one way to skin a cat, so seeing different ways and techniques is always educational.
These kinds of electronics are the best way to learn how to fault find and repair too.
Cheers again!
I am a computer tech and absolutely love these videos
I have learned so much
Like always, great video! The IC chip controls the charging by oscillating off and on charging when on and monitoring when off until it gets to the proper voltage, then stops when fully charged.
I agree , electronics repair is something best learnt actually trying to repair things , im 33, ive been mending things since i was a little kid, i buy anything faulty , it doesnt matter what it is , if its got no power im interested .i think the thing about the 4 am ideas is exactly what makes me able to repair things(i see you make revisit videos on things you couldnt repair ,i see how you dont like being beaten either) , i dont have an in depth knowledge of circuits and what exactly is going on, but my mind relentlesly searches for the answer when i cant repair something and i process different possibilities and outcomes in my mind , and 9 times out of 10, ill find the problem , and im slowly learning alot , i watch all your videos , i try to absorb as much as i possibly can and try to piece together the puzzle of electronics . Also i think i have the intuition you talk about , over time you get much faster at homing in on the fault. Also making less mistakes ang going down unnesessery rabbit holes happens less the more you practice
@reace m Yes all the '4am' people have the right aptitude and it sounds like you are already learning that which no one can teach you. Keep on doing what you are doing. One day soon I am sure you will have the 'light bulb' moment in your head and suddenly a lot of things will come together and it all makes sense.
@@LearnElectronicsRepair im having those moments all the time , iv been looking my whole life for someone dispensing the kind of information and wisdom you are . I very much appriciate what you do and the effort you put in to help people like me learn .
Yeah your not wrong about 4am break throughs, the only problem with that is the urge to get up and continue, im guilty of that from time to time. Keep up the good work all the best :)
Hi, I happened to watch this video, somehow it started after I finished another one, but I honestly watched it until the end.¨
I completely agree with you, the art of diagnosis cannot be taught, everyone has to learn it for themselves. In this video it is clearly shown that we are different in the procedures when repairing a device that does not have a schematic. I would proceed a little differently, but the result would be the same. It is very important how the defect is described, once I was called to repair the device and based on what I was told I started to look for the defect, I could not come up with anything and then by chance a worker from the second shift appeared who described the defect a little differently. At that moment I focused in a different direction and in five minutes it was fixed, if the fault had been interpreted in this way, I could have immediately saved an hour of measuring the functional circuit - the fault was in a completely different place.
I wish you a nice day and a pleasant Christmas holiday 🙂 Tom
For easy problems repair experience is the number one factor in electronics repair. But if you're repairing difficult circuits it helps if you've some design experience and formal electronics education. At least, that is my opinion. Only electronics education is not enough though.
So really in my analogy you are saying the more or the 'art' you have to go with the 'science' the easier it is. But you acknowledge that you still need the voodoo 😉
I couldn't agree more. I've worked with many engineers who have parts 1 and 2 of the equation and can repair stuff well, especially when working on one sort of product (be it TV, amplifier or some sort of microprocessor based controller board) but without part 3 they can't just pick stuff up and fix it.
You are a LEGEND of a hands-on teacher!!! Thank you for all your lessons & tips!!!
Agree with the voodoo, and you really have to have it or you dont, Excellent video as always. Thanks Richard
Always check fuses and indicators first (learned that in the days before leds which are deceptively more reliable)
I've been watching your repair videos to inspire me to repair a transistor guitar amp that keeps blowing fuses, I haven't found the issue yet, but you're inspiring me to continue. thank you so much for all your analogies and troubleshooting techniques.
Thanks! I appreciate the time and effort you put to make these videos. I watch one of your vids everyday like a ritual, the subjects i don't understand I listen to in the background as I'm doing something else, so your voice is very familiar to me. Thank you for everything you do, I have learned so much from you, it's priceless not to mention life changing. I will pass on the knowledge, I promise.
I know just what you're talking about when it comes to waking up or first thing in the morning knowing the answer to a problem you couldn't figure out the day before. Not with just electronics also working on my car.
Preparation, perseverance, and performance...golden video. What fun detective work and illuminating exploration; subscriber for life journeying with a fellow hobbyist and electronic enthusiast.
Cool to see all of this come togther! Very cool seeing someon break it down and ensure the whole system is working as designed
this channel is a god send
Thank you Richard! This was an awesome troubleshooting process and demonstration of analytical thinking along with excellent practical skills. Keep up the great videos!
Good old stuffs are easier to repair than modern electronic stuff... so good luck!
At the start of your diagnostics with the battery charger my first Suspicion was with the LED'S as you tested particular with the green LED With LO READING were it wasn't lighten up likewise i would replace the LED'S. but i have still lot to learn.🤔
Thank you your teaching 😁
Yeah, if it was me I would have narrowed down the likely points of failure based on the problems it was exhibiting and a quick visual inspection to see if anything looked like it failed. Then I check those failure points starting with the lowest hanging fruit. But that wouldn't have made a very interesting video and I really appreciate seeing this more thorough approach as it helps me to troubleshoot my next project even quicker using the new information I've learned
Hi Richard, thank you very much for this great video. Quite valuable asset for the beginners such as me.
Great video as ever, many thanks again, they are all so interesting and instructional. Also, they bring back memories of when I worked at Marconi's Chelmsford and transistors first came in.
Another great video. I really like how methodical you are and that you bring it back to basics 😊
Love your fault finding videos. Thanks for sharing. God Bless.
one advise for gear of this kind: first check with DMM 200Kohm range if the mains primary is broken (might be a broken thermal cutout making the fixing
far different)
LOVED IT! Thank you, kind sir! 😊
I've only recently discovered your channel, thank you for sharing your knowledge.
Watched every minute of it Richard and it was a great watch too
Really enjoyed the video. Thanks for the upload.
Love this video.. reaallly make sense in developing our skill... ❤❤
many thanks for this series.
Did a fantastic job friend. I appreciate your assistance. Hopefully I’ll be able to make something out of your professional career advancements
Awesome video really enjoyed it.
Subscribed. Keep the videos coming I’ve learnt a lot :)
Ideas/solutions usually come to me not at 4am, but in the shower just after waking up.
more like this please :) was super great and fascinating video to watch :)
These similar ones should keep you interested then 🙂
th-cam.com/video/wkAp5x3Z_gc/w-d-xo.html
th-cam.com/video/yJnDOG02f1Y/w-d-xo.html
th-cam.com/video/IQsigvz94_g/w-d-xo.html
th-cam.com/video/3vUmK7Afh7w/w-d-xo.html
th-cam.com/video/1NTNfTgSzgw/w-d-xo.html
th-cam.com/video/NnS4irCLq5c/w-d-xo.html
th-cam.com/video/5duuoPm1JoQ/w-d-xo.html
th-cam.com/video/77EoJz7YjwY/w-d-xo.html
th-cam.com/video/GjZtZNssroE/w-d-xo.html
Awesome learning experience watching your video :)
Great job 👍 doggedly determined, wonderful, did enjoyed
I would like to see a video on repairing 24 volt inverters.
Really Helpful. Thx LER.
quite informative. thanks
Just joined your patreon group. Fascinated with electronics as I got tired of throwing my money away on tools and gadgets that looked brand new, lol. Well I’ve had some beginners luck repairing a few of my tools. Some are obvious and some not so much. Learned OHMs law and now reading and watching. You are like the Columbo of electronics. I think I have the instincts for this although pretty late in the game and my life’s work was more on the art side of things. I am having fun watching how you completely figured everything out on this tiny board. Really Amazing to watch you analyze this work!
Thanks
Love your Channel, very best on the web, just another amature, regards. 😎😎😎
Thank you so much. You are my master!
excellent video, thanks for sharing, it helped me a lot.
Ron
Mantap bapak yanga satu ini.👍
43:12 / 58:11 easy way to test if signal led is alive is with multimeter on diode mode, (while device is TURNED OFF) on that mode, probes are emitting voltage and you can turn on (barely but visibly) LED in circuit by using multimeter on diode mode and correct polarity, if u invert polarity it shouldnt really burn anything because its on low miliAmp range. (Depends on multimeter, so measure your multimeter modes before you use them.)
Mentality applied to electronics that can also be applied to life lol. I feel like I learned about a lot more than electronics.
Excellent.
I've been in a technician for over 15 years and I'll tell you that even when I didn't know what something should be I tested it anyway because that was the way that I figured out what it should be I think that testing things even if you don't know what it should be after a while you'll start to see the components and start to learn what the item should be if you don't test it because you don't know what it's supposed to be then you'll never know what it's supposed to be just my take on it I'm not an electrician but I'm getting a lot better at it also I do General love your content I've learned a lot from you
53:10 looks like the mystery IC is MC14060 OR CD4060 and the task of the IC is to give a 10H/12H/14H Charge timeout (after each mains power outage) to not cook the batteries forever
Thanks!
finaly someone who is think simular :)
i do the job of repair units where someone sayed previous "throw away and buy new" .
i am working for poor people only !
Intuition is the most important thing in this context.....i wake up all night because i understood somerhing.
voodo is maybe the wrong term....but i is go really near the truth;)
live long and healthy:)
would you like to tell me what kind of probe contacts (probe leads) you use?
ps: sorry for my poor english......and thank you!
pps: i skiped sometimes forward, because i already knew ;)
and if it help you i look again without skipping....;)
Tempus fugit !
Regarding the last method: I think the biggest part of that intuition is pattern matching.
There is also the "Brute Force" - method:
Unsolder all components and test them to their specification. 😉
Thanks
3am for me and the algorithm just appears in my head. Can't sleep after that. Regression testing of sorts start from the fault or bug in my case and step backwards.
You Showing is in fact teaching but that does not guarantee that someone is learning"...that depends on the individual? I am definitely learning from you.
thnks a lot i finish the video w/o skipping even the adds.😊😄
Excellent video, as per usual. Just one question: what is the differences between common ground, common return and neutral?
Fair play to you Richard 👍 you must feel like professor Snape attempting to explain the 'dark arts'
Great channel this. 👍🇮🇪💚
Hey coach l watched the whole lesson I was amazed h how much checking you had to do that's why call it trouble shooting ya did great from tony I've been watching for some time it's always good cheers 🙋
Hey coach ! Tony here again I think if newbies plug in their projects into a expensive peace of equipment and wala its fixed I'm a genus ' and collect your fee 🎉 and the customers ask what was wrong with it , and how did you fix it ? Well yeah their happy but then you don't have the foggiest idea well I couldn't live with myself.😢 thanks oh yeah could you tell us your first name if you care to .
😮
I have often found after visual inspection the quickest way right from the start is to check with a soldering Iron for dry joints and repaired many valve T/v's in the past and saved a lot of time ?
Resistor Colour Code: Red=2 Orange=3 at 16:50
MAX713CPE MAX713 NiCad/NiMh Battery Charger IC is a 16 pin candidate this is my thought at 29:00, but now it would seem this is a very basic charger !nice video....cheers.
Apparently from another subscriber who has the same charger it is HC4060 CMOS oscillator+counter. The resistors limit the charging current and the counter turns the charger off after about 12-14 hours. So very primitive.
Thank god for your existence 🙏❤
I deleted my comment -"Looks like that green led is buggered" as I thought I was being daft...until the CA confirmed it. :-) I also wanted to add that the hot melt glue on the base of the 2 red leds is a bad idea - that glue goes on so hot it can bugger up soldered joints, I learnt that the hard way Richard..
This is my electronics prof
It seems this is a very simple charger with a counter inside the IC which is feed by the oscilator and it just stops charging after 14h or so. Current is only limited by the respective resistors.
Hey yeah, That could make sense out of the slow oscillator with 1% tolerance resistor
im only 8 minutes in but if you didnt mention it: FOLLOW THE HEAT, heat is bad in electronics, if a part is getting hot, chances are it might be bad!
edit: this is mostly for digital electronics, good old analog stuff tends to be cold when it's dead because no current is going through it
check your voltage rails and follow the voltage, where does it stop?
I have this type of charger, the IC is HC4060 , oscilator+counter for the long charging timing (around 12-14hours).
Ahaaa - that proves it, THOM Brick suggested that is how it works and now we know. Cheers!
Have you ever tried using the different filters on an iPhone camera or in the “Magnifying” app in iPhone utilities to try to identify the IC’s markings? Or, does your M-scope have imaging filters. I’ve seen I done a few times and works fairly well.
No filter would help you here, the marking is clearly ground, I have various filters both SW and HW for the lens, but when you get a part where the mechanical marking is removed mechanically or with a laser, all filters are useless and the only thing that would help is a crystal ball - Unfortunately, I can't find a functional one here - it won't be fortune-telling 🤣
This is a good demo. Please try to move board less or, at least, slower.
Is your camera going bad Richard ?
Around 20:05 , you can make up some sort of horizontal lines, if you fixate your gaze on that black IC, you will notice the lines quickly showing up around that part of the screen
Just thought I would inform you
Probably a carbon based resistor connected to the LED which has a negative temperature coefficient, causing the resistance to drop and the current through the LED to increase as the temperature increases, slowly killing the LED over time.
you really need to make oscilloscope for repair tutorial, cro are cheap these days
I have similar charger. The red led lights up when charging and the green led comes on when charge is completed.
Philip
16:28 pretty sure the logo is STMicroelectronics
The 4 AM answer .. it’s happened! The mystery discovery/confusion/unexpected + time = …