How to find short circuit component without spending $6k on FLIR cam.
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- Опубліковано 21 вер 2024
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Those in "the know" know that there's ALWAYS some other issues on boards besides the issue it was sent in for... yes mark my words on that.
Really loved the tossing up part to ta back of the bin... Great lesson there..
Hi... You probably won't even see this but since im already here im going to ask anyway. I have a laptop (not a mac) and i have this problem where the power wires that run inside the laptop to the motherboard socket (best way i can describe it since i dont know what that particular piece is called) and the socket head keeps burning up, this is the second one i have already and its completely burnt the wire again. My laptop works fine though. There is literally nothing else that seems to be wrong with the laptop other than that power socket that connects to the motherboard keeps burning my wires... Is it because of a short somewhere or do you have any suggestions maybe what it could be?
A digital multi meter called a DMM has amp high and low. My Fluke 87 V will take 15 amps but most are 10 amps. This is a lot of amps or current for any laptop circuit. From the power plug, if you have actual wires (Let’s say 3) and #2 burns, discolors or melts, that one circuit is pulling too many amps. The plastic is the connector and the metal part (Male & Female) are terminals. Both side should be replaced at the same time. The female side touches the male terminal to allow circuit voltage and amps/current to pass. Heat damages the female side spreads, loosing connections. The damage is done but reduces amps due to higher resistance. If there is nothing between the power connector and the connector, there is a problem “After” the connector. Most have a pair of switches or Mosfets, that let amps and volt thru, but if high voltage, reverse polarity or high current in certain designs, the second MOSFET opens to protect the circuit. To test an unknown amperage, you have to open the circuit/wire to make the current pass thru the meter. Start on the high setting and if less than the low DMM setting, move the RED meter led and write down that reading while on and working. Get inventive, take photos but make sure everything is hooked up, then turn on. Mosfets fail, so do caps or capacitors. Follow the copper traces (Under the Blue or Green Lacquer coating) Screw holds are ground so if on, connect the BLK led to one and test for voltage at other components at the soldiered leg and write it down.
If you watched Louis video, he gives you the name of a website to download by make/model and work from there. If it’s older, the battery can be an issue as they are on this supply side. They can pull enough amps to get warm/hot/fire...Fire Bad! Hope this help. Louis is clear to hear, a little funny, but calls balls & strikes. I have a dead short in a 3 year old Dell that I will be working on. He is going into my saved file. Hope this helps. Automotive ASE Master Tech since 1978-Retired.
How does this customizer manage to guarantee to always have at least two errors on one board?
Fault-finding in electronics is only for people who are passionate to learn those special skills, and it can be a real challenge at times! To find short-circuits on any PCB, I try to isolate specific areas, just like you, and then power-up the Board with correct voltage - from an independent supply. You favor the use of alcohol to search for a rise in temperature of the shorted-down component. I do this differently. These days, a cheap Hand Held Laser Pyrometer will find (with the Laser point) the hottest component on the Board. This method really works a treat, and no liquids or other contaminants are used to wet the Board. The repairs of almost anything electrical has been a lifetime's hobby for me, since I was 14. I am seventy now, enjoying my retirement to spend more time fixing electronic consumer items. I agree that there are many "tough dog" problems, which eat away at your time, and your reward would be almost nothing! Finally, I want to say that I really enjoyed this tutorial, and also your personal views on life. Best wishes from Australia.
Peter you are my spirit animal
Always good to hear passionate people, you are the Masters! Greetings from Italy
mr Peters am interested in a basic pyrometer to find shorts on pcb.can you suggest a couple of models? thanks john
When pyrometers costed a fortune we used receipts for overheat detection. The thermoprint paper they're made on starts to darken at about 50-70 celsius so we've used to put them on top of transistors to monitor if part of scheme is heating.
Not the best way but an affordable option
Glad to know about your passion. I (aged 62 years) find somewhat in a similar situation. Nothing can give me so much satisfaction as I get when I am able to bring the stuff to normal life. I can willingly work on a gadget repair mission for even hours together without caring for hunger and quality of ambiance. The only irritating factor being that after isolating rogue component, I am unable to find the replacement component, be it new or old one, particularly of very old model such as iMac of 2010 or 2011, though many of its assorted modules as a whole are available online at the killing price! Notwithstanding such occasional setbacks, I never find short of enthusiasm for the next round of challenge of repair !!
I totally agree with your view on balance of self and sanity against work for a better life. I took electronics in 1992 but didn't graduate and watching you attack an issue even as rough shod as it may be is mesmerizing to me. I could grab a bag of popcorn and watch you troubleshoot as if I'm watching a blockbuster movie at the theatre. Thanks for sharing your daily grind with all of us out here on the internet.Christopher
why didn’t you graduate?
I used a similar technique with freeze spray which turned the board frosty white, and after applying a littler current to the shorted circuit I observed which component defrosted first. Considering alcohol cost far less than freeze spray I really appreciate your tip. Thanks!
Grants Pass TV Repair It follows the rule of what is in front of me.
Freeze spray is something I must order.
Alcohol is something I can buy when I walk fifteen steps out of my store.
Impatient yuppy will only pay if it works NOOOOOOOW, so I pour a bottle of alcohol on it.
I've heard this about compressed air. Considering the cost of freeze spray It would be nice to figure out how to make it my self.
instant freeze of the board will not damage the components due to sudden contraction?
@@TTRVision no
@@FlourescentPotatoare you sure?🤔
For all of you new to Louis's channel, he's the real deal.
+Nathan Taylor Thank you!
+Nathan Taylor it didn't take long for me to see that! subscribed!
oldestgamer
Thank you!
THE most informative video on this subject I have found. I learned more watching this 46 minute video than dozens of others. Nice pace, straighjt to the point, not repetitive, and very detailed, thanks for making these videos Louis!
P.S. The only suggestion I would have is maybe use a Large Inverted color scheme for the cursor, it's hard to follow the mouse when your pointing to things on the schematic.
@@JimWilson619 Hi, I was wondering if you know where I can get schematics from? Specifically graphics card schematics.
I'm an automotive Diagnostic guy and I just had a 75 Jeep with a snow plow that was inoperable. Figured this will go quickly, tracked it down to the remote and figured why not open this up and take a look see... Can't be that special right? It runs 3 1 wire solenoids ground through the body and 1 big 200 amp solenoid. When i cracked it open I found an atmeag 8515. For some stupid reason I was expecting a few mosfets and some buttons. Lol I really like your movies and appreciate the time you spend with us on these repairs. 👍I love my hakko iron!
Thank you for taking the time to make this and all of your videos good sir. If you weren't a good teacher then why would you have almost 200,000 people signed up for class?
The method I have been using for 30 years to locate an overheating component is to spray the board with just enough freeze spray to cover it with a light coat of frost, and then watch which component melts the frost immediately. For larger boards, just spray one section at a time.
I really enjoy your videos. Since I haven't had much need to deal with BGA's until recently, your instruction has gotten me proficient very quickly. Thanks.
Even an old man can learn from you! thanks and don't stop helping others, that's what life is about.
I'm glad to hear it, thank you!
The comment in the last part might just be the most valuable info:
Make the choice to stop and smell the roses at some point in time.
I find it to be a hard choice, when I have to - not finish what I started, because
it feels like a disappointment. But if you don't, the work will govern your life,
instead of the other way around. Great video; thanks.
You're a brilliant teacher. I literally spend all my free time between you and Eli.
And building a forest gym.
No comments. Very grateful. There's free beer for you here (if you come fix my pc :P).
Knowing when to quit was the most ingenious part of this video. You have a far steadier hand than me too. The missus didnt understand why i keep old boards and components laying around and after her, surprisingly, watching now sees why. Thanks for a great video, hope to see more.
I like your mind set young man! on whats inportant in life. thank you for one of the best UA-cam experienes I've ever had
Worked in electronics maintenance most of my life. Little experience with surface mount stuff. I appreciate your demonstration of using the smoke tests to find problem shorts as well as the demo of unsoldering and resoldering using hot air. Thanks a lot your a pro.
I agree,I used to repair boards at chrysler.And i felt the same way,If the board started to look beyond repair after about 2 or 3 hours it would go to my salvage pile.
There are those people who talk AT people and there are those people who talk TO people...YOU fortunately are one of those who would make a good teacher....you talk TO people so I have to say would do an excellent job of educating others who want to learn from you.
I love how you bring some real world philosophy into your videos. Can I fix it? Sure. Is it worth my time? Hell no! lol
It's about time we have someone who speaks the truth and doesn't just say what people want to hear!
people who complain shouldn't waste bandwidth on comments. make a video and show us. I appreciate the effort you put into helping people like me. I'm a beginner, and a few of your techniques have helped me get past some brick walls. thx for taking the time to share knowledge.
[touches it] "Ow."
[touches it longer] "Oooow"
"So we have the are we are looking for..." Truth is, this is still the best method. :D
Hi , when you were talking about having the knowledge in your head but having problems with putting it into words i totally understood your problem . I have a friend in Ukraine nd we message a lot . She is trying to improve her English and every so often she will ask me something about a word or sentence formation , i have it in my head but have the same problem as you . Trying to put it into words just will not happen . Surprising how much stuff we have rattling around in our heads that we know but can not put into words . Everyone who watches your videos appreciates what you do even if they do not understand the technical stuff , Worth watching just for your life lessons
This is the first video I have seen of yours , and it is an excellent tutorial ..I have subscribed and look forward to seeing the rest and future videos. Thank you for sharing your knowledge with us.
+JOGO Thank you!
+Louis Rossmann I HAVE SOME CIRCUIT BOARDS THAT DONT WORK FOR AN LED SIGN COULD YOU CHECK THEM OUT FOR ME MY SIGN IS USLESS WITHOUT THEM MY EMAIL IS DAVISCUSTOMCYCLE@GMAIL.COM THANKS RANDY
+RANDY DAVIS I think he only does apple related stuff, contact the manufacturer of the boards.
TURN OFF YOUR FUCKING CAPS LOCK WHAT ARE YOU - OLD?
I've been a tech for approx 40-years and enjoy watching Louis work because he is a very skilled young man, and I think a lot of folks who watch him don't realize how many years of work and effort are put forth over so long of a time to be able to comprehend circuitry and have the techniques to identify and resolve various problems. Being a circuit level tech, I dread the liquid damaged equipment because it is time consuming and the final repair is not as reliable to us, the tech, as we'd like them to be. Worse yet, is when a customer has attempted repairs themselves .. much more work for us. It is rare for me to see a good tech, much less a good young tech such as Louis. This is a dieing art, and we who dedicate ourselves to nothing less than perfection in our work are craftsman of the highest order. Too bad the pay wasn't commensurate with the skill level, decades of learning, equipment in our arsenal, and our unbelievable patience in working the circuits. I often struggle with the choice of continuing with a problem infested board after repairing multiple problems, knowing the very next repair could bring it all back to life, or tossing it aside and grabbing something I can make money on in 15-minutes or less. But it's fun, frustrating, and sometimes .. if we're persistent .. we can even make money. What I am saying here is that I hope viewers recognize that Louis is an outstanding tech, and any so-called 'trolls' or critics should think twice about making any negative comments. I myself am a high level tech and would hire Louis in a minute if I needed the best tech I could find. Good work, Louis! True craftsman.
i actually go back and like your videos just because i really want to support you. I genuinely enjoy listening to you.
Louis,
I totally agree with the comments you made at the end of the video.
Thanks for the Vid.
Finally someone who makes it more simple to understand for us keen but not super educated people. I can use common sense to fix stuff and have had a good amount of success but your videos have been super helpful. Very much appreciated. Cheers from Australia...
He's a true New Yorker, He has a New York State of mind (not a bad thing) i know this i'm from NYC too it's cold weather and even colder people, a city of about 10 million people but you'll never feel so alone, you'll know what i mean if you ever rode the NYC subway train. just try to say hi to a true new yorker (born and raised) they most likely would look at you like i don't you a-hole. I heard northern Cali is the opposite but i never been.
Dude I have to say you seem to have figured out what's important in life at a much younger age than most folks, Including me. I worked myself to the point of damaging my body to a point where things are not fun anymore. I made lots of money although I look back now and see i did not charge enough for a lot of things but hindsight is 20/20. The moral of the story is work hard but take the time to smell the roses along the way.
So, your old Hakko is like my ex wife? Takes over 3 minutes to warm up, isn't as hot as it used to be and doesn't blow like it used to? Yep, that's Kristen.
Damn thats funny, LOL mainly because I found out I wasnt the only one with that problem!
lmfaorotf
Lord, plz dont let Kristen find this comment. may this man take it to his grave, if not, i fear the grave will find him
just stop dude
Lol,
I find myself watching your videos for jobs I'm not even doing. Congrats on having possibly the first good educational AND entertainment channel. Good stuff, thanks for the info.
Also......agree with EVERYTHING you said at the end of your video.....I wish I would've walked away many times as well. ....instead, I would sit for too many hours batting my brains out and getting aggrevated and end up throwing in the towel after losing money and time , just to keep my reputation in tact.......Inn the end, no one cared and all I did was end up hating a business that I loved for many years and became disgruntled with the industry. ........
I now drive a limo and don't like that bizz very much, but, I guess we have to pick our battles........
It all comes down to the $$.....
As it always does....!!!!
Good lesson learned, I learned it after many years of frustration in the electronics service industry. !!!!!!
Frankie same here i went to work for Greyhound driving a bus paid more and less aggravation but i did manage to get retirement from Motorola before i left now have Greyhound retirement also finally in retirement i am getting paid for all those years of aggravation.
Learnt a lot from not only by this video but also others. As soon as the video finished I have checked for the title (hoped PART1) :)
Thanks to you enthusiasm does not die. You got the a huge fans all around the world.
I used to run into cars from certain customers we used to call "charity cases" where the customer had 50 things wrong with the car and only wanted to pay you to fix one of them, but the other 49 were interconnected. That car would go in the back corner until I was able to get the paying jobs out and actually make enough money for supper that night after paying the bills, and then I would come back to that "problem child" the next day.
Sometimes, that customer would be as big of a headache as their car was where they would call every hour on the hour wanting to know if the vehicle was done yet.
I learned late in life after becoming disabled that there is things I wanted to do with my life other than "solving that next challenge", that I almost didn't get the opportunity to do. It's good to see that you know when to call it for the night, go to the gym, take care of yourself as well and let the charity work wait for later.
There's a reason that customer is bringing those "basket cases" to you, they probably got ran out from every other tech's shop before.
I like your priorities.
This video is exactly what I needed..finally after hearing you say it a million times I focused on P3V42. It didn't click before that I wasn't getting voltage to VIN for U6990. With only two components before it D6905 and R6905 it didn't take me long to find the issue. R6905 was reading infinite resistance. I removed it and put a through hole 47ohm resistor there (just for now). Sure enough I now have 3.38v coming out of L6995.
I dont have a new LM397 to fix my One wire circuit...so I cant see how far Ive gotten. Despite that, I am extremely happy to have made any kind of progress. Now to find a cheap parts board. Thanks Louis!
An LM397 is a common part. You can buy them just about anywhere. For example, Mouser has them for less than $1 USD each. If you're outside America, there are other places too. For cheap parts like this and resistors, capacitors etc, it's not worth it IMO to buy whole donor boards. Sure, if you need a custom IC or expensive part it can be useful, but with "jellybean" parts, I buy them from local parts suppliers - and get extra confidence since they're brand new.
Agent24 Thanks for the tip. I did already find it on Mouser. However, I have another c2d coming my way in a few days. I wanted to have a donor just in case, like Louis says, you order the parts fix it and then find out something else needs fixing. I do agree new components are preferable. There is a place I go to for electronic parts but I think he might have to order these. Still I will check..driving 45 minutes isnt a big deal compared to waiting a few days each time.
But just out of curiousity, do you know any other common products the IC is in? I might have something laying around I could borrow to test with.
SunDragMeHere I guess I'm lucky in that I can get a lot of parts locally or on overnight courier, for one-offs. Most places would keep some stock on hand of really common things though. When you repair many boards you can get an idea of what kinds of parts usually blow, and keep a stock of those without worrying about wasting money on them: you know you'll be using them.
Aside from another board the same model or similar, I can't really list a bunch of products you'd find an LM397 in - I don't know. It's a common, as in "not complex" part, but unlike the really, really common parts, like 10K resistors or 0.1uF capactors (which are in practically _everything_), it's not common knowledge where you'd find one. The time taken finding that information, finding a board etc, it's not worth it for a $1 part.
subscribed ! best resolution Tools and setup ever seen ,
Gratz !
You have not seen much.....have you.
tiberio135 no , im in eye resolution and im on point to buy a setup like this one , and you did you have a setup that kill this one to sold at me ? im not sure how i need to catch your comment , maybe you can explain it .
jeff pepin ????
tiberio135 what you said ???????
+tiberio135 This is an intelligent channel, we have no need for rudeness. Great video and Louis and his setup are awesome!
I know this is an old video, but your tutorial helped me find a shorted out chip on a video scaler I've been working on for ages.
Respect to this guy... "I'm going to live my life"
Nice diagonostic skills. I liked your last decision of sending it to bin. Everything we do is for life and life should be enjoyed.
You don't need to spend $6k on a thermal camera to find a bad component. The $250 FLIR One thermal imager attachment for smart-hones is good enough for that simple task.
Ahhh Tori on your desktop that made my day. In 1998 I was in 11th grade and she randomly came to Springfield Ma. I could tell a long Tori story but I'll spare you. - I pulled out this 17" mid 2010 I impulse bought 4 months ago bereft of life. Figured I check out a couple of your vids while I see what the damage is. - "Cause boy you still look pretty
When you're putting the damage on."
Tori is amazing! Baker Baker, Not the Red Baron, Winter, crucify, jackie's strength
we need guys like you after skynet
+Ron Paul -- Skynets, they need to relaunch the terminator franchise to include multiple Skynets to account for those people/country/corporations cought up in the Googlesphere, Applesphere, or Microsoftshpere skynets....The big reveal at the end can all hinge on what side Amazon allies with in the war to destroy Mankind (and the competing skynets)
+Ron Paul - LoL
You're a stronger man than I...Seeing that chip, I would have thrown it out. Probably why I watch your videos.
i like how your down to earth and give away all your little tips.
1st time viewer. Awesome techniques, whatever it takes to spend the less money, maximize profit, and get the job done!
Static can put kilovolts through your components, a different matter from 3 volts and some amperage.. so disagree there. And also I've found that the best way to learn something is to teach it, you thought you knew something, after trying to teach others you notice all the things you did not know and get better :) Highly recommended.
no kidding - as talented as this guy is I would not send my electronics to anyone who doesn't take ESD seriously.
+ss l Me neither. Also, setting his PSU to supply 10Amps and waiting to see what got hot. Not wearing safety glasses.
high amperage low voltage makes more sense than limiting amperage as the circuit itself will have resistance. if you want to limit amperage, then just set the power supply to 0.5v, no amp limiting, and slowly go up.
This is the first video and i really like how you do the troubleshoot with alcohol. This is a create trick. And thanks for your comments about health. You're absolutly right, its important to be healthy to achieve good results.
Nice video. I like the idea of using alcohol to show up the bad part!
Here's my (hopefully constructive) critique and thoughts:
I would watch it with the external power supply. 10A current limit is overkill IMO, start at 0.5A or 1A or so and work up if you have to. The shorted IC here only took ~400mA and heated up well enough to be found easily, but you can't always count on a bad component limiting the current itself. 10A is enough to make things go up in flames, especially if it's a ceramic\tantalum capacitor, and burning a hole in the boad is going to ruin the board and your day. Also, I find the back of the hand\fingers are more sensitive so they work better for finding a hot component at lower power levels.
For those who don't worry about ESD, I still think it's a vaild concern, even when you use troubleshooting methods like this. With a suitable current limit you are not going to blow anything, but ESD can still cause problems, and the effects aren't visible, or even always consistent. ESD damage is great for causing intermittent problems, problems that make no sense, or boards that die 2 weeks after you fix them and then you're just wasting more of your time and money. Anyone interested in ESD prevention should check out Dave Jones on the EEVBlog, he's got good videos on setting up an ESD safe work area. Proper ESD precautions help rule out one more thing that can go wrong, and in troubleshooting electronics, the less unknowns, the better.
Agent24 Good point.
On 5v or 12v rails I usually start at 0.2v, 10 amps and take it up slowly. It's best to start with unlimited amperage and ultra low voltage first. Here I cavalier'd it to 3.4v instantly because I knew this board would be shit regardless. :( And sadly I was right. :( Cool things about the real knobs on it is you can turn things up and down pretty quickly!
Just to confirm: What kind of alcohol is he using?
A long time ago when I used to be assigned have to go around our large office cleaning Xerox machines in internal areas such as the pressure roller, printer drum, scraper bar, etc. that had toner and paper dust accumulation, I was given a can of special cleaning fluid that according to the content label was just 100% Isopropyl alcohol and told never never ever use the stuff from the pharmacy for fear shorting something as well contaminating other things inside these pre- Laserjet era printers.
That may sound like over kill, but since my office was the national advertising agency for Xerox and used those copiers heavily, we just did what was recommended without question.
I can only assume their reasoning was the stuff from the pharmacy was a
mix of water and alcohol which could cause a short of the electronics as
well as contaminate things non-electric.
I knew that the CVS/Walgreens stuff labelled as Isopropyl is just as deadly to consume in a cocktail as the stuff Xerox says was required. But the rubbing alcohol never made my fingers turn ash white and give a dishpan hands look instantly due to absorbing the oils and water from my skin. Apparently besides not mixing martini's with it one was not supposed to use 100% Isopropyl on expose skin either.
Marc Chavez in another video he said 99% alcohol
I think it's Jägermeister ;)
I know it's 4 years old but I've just found out about Louis and 'very been watching eevblog occasionally since the middle of 2010s and writing this just to share that they kinda made cross-over: Louis is actually featured in eevblog #1222 Apple's MacBook Design Fail
My Weller station (50W) is from 1977 and was used for over 15 years in my dads TV repair shop, it has also been my main iron in my sound & light shop for over 10 years and is now sitting in my home lab.
Of course it has received different tips over years but the heating element is still the same and working as expected.
love the mental health comment,and thank you for shearing great skills and knowledge.
John Pannell +10!
The best way to retain what you learn is to teach someone else. And thank you for your videos, have a great sir sir.
Great point of view at the end, get your priorities straight and live your fucking life.
YES!!
Louis Rossmann and that alcohol trick is awesome! thanks a lot for it :)
can i use methanol?
You can but you shouldn't, breathing in the vapor is toxic.
Anyone who has been to college, and it probably does not require going to college but in college you have all these PHd's who try teaching, can testify that you can be very smart and educated and a terrible teacher. Good teachers are treasures.
I also am a macbook repair the circuit board, I was in Vietnam and I'm happy if exchange and learn from you
cau truc cau sai roi anh oi, ho ko hieu dau
Dude you rock so hard on this stuff man! I don't blame for getting up and walking away from the board instead of spending 2 more hrs on it and maybe fixing it.
Every day we live is one less day we have. Time runs out for us all like sand in an hour glass.
Just came across your videos, awsome. Cant wait to look up others you have.
Hi Louis - I know this an old video and I have watched your more recent ones - but this is a gem! Your honesty and forwardness (is that a word?) is excellent and I think your teaching skills are far better than you think. Aside from teaching us about motherboards, their typical problems and diagnostic trouble-shooting. I think the best lesson to be learnt here is knowing when to stop, call it a day, go to the gym and meet your friends for dinner! (Sadly gym's and dinner are not really viable under present circumstances - but I hope you get my drift) Thanks again for all of your fine work, past and present. Damo xXx
layin it on a little thick arent we? u lookin to get a room with the dude bruh?🤨
No one cares, but the listening costs nothing. Most people just want to unload, have a rant, and get on with life.
Your videos are like virtual hands-on training. Thanks for demostrating it.
And last part message really worthy enough to be remember.
maybe spray some freezer over the components till they go white.... then see the one that thaws out fast
conductivity
Hi Louis.
A quick tip from a guy who doesn't like to burn his hand... You can use thermal paper to find where the short is, its fast and precise.
Congrats for your business ;)
I will find some! I use the side of my face, not much need for me to have a working one.
The Lepton FLIR sensors are U$182, maybe make one and post up how you did it?
also this
I blew polarity protection schotky diode when powering Macbook my solar buss to the spliced MAGplug. I saw the glow through the white plastic near jack at power up! Love the Macbook black PCB and engineering. I replaced the 1mm sized diode pair but didn't need to since I will never reverse power input again. I also love saving 100-200 watts 24/7 by not using a desktop A/C. I use digital voltmeter on microvolt range to find big voltage drops cause by errant shorts. Make a cell powered op amp kludge with test leads for finding milliamp shorts.
The advertisement on this video was for FLIR cameras hahahaha
i start teaching automotive classes and it is hard especially when you talk as if everyone knows what you know (phrases, acronyms. etc) its good to have another person there to help you out when that happens.
he has some basis videos. it's just way too time consuming to explain everything every time, he gets paid to actually repair the boards.
2:20 if only he had paul daniels multimeter software lol /s
You are a better teacher than you think just talk about the stuff while you're working on it I learned a few things that were helpful
glad to hear it
You can get a Flir E4 for 1K and upgrade it free to a flir E8 320X240. (if it has the versión 2.3.0 or older). I have done it and it looks great. About tools I dont let myself be limited in that department I like to make things easier, faster more precise and simpler and good tools help me do that.
Oh Boy!!!!!.............Have you listened to yourself winging about how people don't care, and other issues, you have a fantastic brain, you are very gifted. probably because you studed so hard, stop being so negative, you need to chill out, and take a break from work.
(With the respect you deserve).......Ray H from the U.K.......SUBSCRIBED.
I love these videos. No bs in them to get more views just straight facts. I manage a shop that works on phones and in the end it's the same idea. If I have to pay my tech more than what we make off the repair then it's clearly not worth it. It's a rare occasion but sometimes I have to just let something go otherwise we will end up paying the customer to fix their phone whether it be parts, paying my techs, or just the simple fact that the repair will cost more than buying another phone. If we can't fix it because it would cost more than the phone honesty is key. This keeps them coming back and the next time around we do make money off a repair so it pays off in the end. I've learned time is essential in this type of work and yes if you don't take time to clear your head than your performance won't be where it could. Anyways thank you for making these videos; I have definitely learned a few tips and tricks from you as you are more experienced than I am.
Guys if he seems harsh at all sorry, That's just how it works when you run a shop like this; every repair counts. You don't have countless people buying products all the time. You only have the few repairs people bring in and you have to make it count for any kind of profit.
You're technic was simple but effective your flushing out the grounded component to confirm defective thru the use of alcohol perfect approach sorting out the problem, Thank you very very much for sharing your effective techniques
Great video! Thanks for posting these ideas. I've been an EE for many years, but I never stopped learning new, clever tricks...
As for explaining the EE design concept for the charger input, I would have just quickly mentioned the 2 diodes. Those are dead give-aways that you have a 2-input power rail.
The reason being, of course is to avoid a cross-current between the inputs. You don't want the battery to try to feed back into the charger / AC-adapter, or the AC-adapter to directly feed the battery without charge-regulation (battery explosion : bad).
And the inductor, is of course the energy storage "bucket" for the buck-converter (PM6640).
A "quick and dirty" explanation could be that, unlike LDOs that just waste energy as heat, to drop the voltage, buck-converters (along with other types of DC-DC converters, like boost and inverting) use an oscillator and an energy storage component (inductor) and they are a type of switching power supply: they store energy in an inductor etc. and release it to the output, as needed, so they only draw power that is proportional to the output load.
This makes them way more efficient (but kind of a bitch to design / tune and having another oscillator can give you more EMI head aches. Yeah: no free lunch).
I had to design like 5 different DC-DC converters for our robot's power subsystem, at 5V/10A, 24V/4A etc., squeezed next to EMI-sensitive stuff (multi-gigabit signals) and trying to keep everything cool.
Not a trivial task...
Any time the IC datasheet has 2+ pages of "PCB layout guidelines" with bold text and exclamation marks, you know you're in for a ride...
lnpilot GOOD CONTRIBUTION!!! Thank you.
Louis Rossmann Thanks! Love the alcohol trick!
:)
I did end up buying a FLIR E60 though. I used to put my fingers on the MOSFETs etc. to debug new prototypes for over-heating, but burning my finger tips got old pretty quickly.
It's also great to just put up a thermal image of the running board next to the PCB design software and see exactly where I need more exposed copper / thermal vias etc.
Yeah. I wish those cameras were cheaper. I could use a higher resolution (than 320x240), but who the heck has $20k to burn on a 640x480 FLIR?
Most do not need FLIR. FLIR are rated for use in the field, for all sorts of durability standards that make no sense for something that just sits on a desk in an office for measuring motherboards. I would love to find an alternative that is less expensive.
Louis Rossmann True! There are some cheaper ones without their own screen, designed to be used with smart phones, but the resolution is crap, or the temperature range is too narrow (or both). This seems to be the only usable one:
therm-app.com
It has a 384 x 288 res, better than the E60, but the frame rate is pretty low and the temperature range is too narrow for a lot of electronics thermal tuning.
It should be enough for debugging though, finding that short at a glance.
They have 2 higher-end models, the TH and the Hz, but those are more expensive.
I would want something with the accuracy and screen of a FLIR but without industrial durability(and price tag that comes with industrial durability).
"Static is the least you need to worry about if you're sending a board to me."
Haha... I love this guy !
that 8 pin ic looked as though the solder contacts looked heated as well.....
the area around the contacts
weren't as shinny and looked heat worn....
EXCELLENT JOB. .!!!!
wow i dont know much about electronics but for some reason i like watching the repairs and you make it look easy i like the magnifier scope, the schematics and all the other great equipment your using. you make great videos. your dry humor is great, its so true and funny. thanks for sharing your techniques.
Bravo Louis, You are a troubleshooter extraordinaire, I love to see someone else come to exactly the same conclusions I did years ago.
Do let us know how the hot air tool service (replacement parts) goes.
I am a Leister HOT JET S’ owner and I think the Hakko nozzles may fit it.
You are an excellent "master level" component level troubleshooter, not many of us around.
bought a new pre built pc. used it over 2 years never had problem. one day I decided to slowly upgrade and eventually chuck in beast vid card, so power supply 650w was recommended. so I bought 650w psu, installed it month later started to hear ringing my ears I never heard before, now I see adds all over you youtube about Tinnitus.
Smart decision my friend i was working on something similar and the results were the same . I just gave it back to the customer and said the board has to be changed. I ain't wasting my life on that.
You are so right about that and you’re doing the best job you can do. I think the same way as you do. Your time is money. Your life and staying healthy is important to you. As I say to my self, “Go with the flow.”
hello mr Rossmann, i follow your vídeos, few month a go, i enjoy your tips, and your way of thinking related with tools and critcs to the manufacturers wont give support, thank you for sharing your point of view, i think is right, cheers from Portugal
I lmfao when you ended the video and screen went black. " I'm going to go live my life" lol the hardcore truth that came from your frustration toward the end of the video was priceless xD you sir are an aspiring philosopher. ty for the vid it was awesome
I don't understand shit, but I think for someone who does this trade, he pretty much explains on full clarity. Thumbs up
This is the first vid I saw from you, and it was educational. I also agree with your philosopy...live your life and enjoy it.
I watch to the end of the video, but not really watch it, just listening you talking while doing lousy soldering here. I like it, its like listening to a radio
While the start of the video right through all of the testing and moving on to the next issue is relevant, it was what you said at the end that resonates more.
Sure, it's important to establish yourself and to work hard to learn your craft and become an expert.
But there is more to life than work and it's the balance of work and personal life that determines if you lived or simply existed.
Keep making the vdeos, Louis, and keep filling them with those philosophical nuggets.
Thank you for another great moment.
Very cool kid thanks for showing what you do, I retired a few years ago from 33 years in military electronics I would call you a heavy lifter that is guys that get things done. I will look at your equipment list maybe do something in my old age again thanks
Got a flir camera ad
That was entertaining as hell. I got out of component repairs years ago and now I know why! Thanks for the video.
You can get an IR camera for your phone for about $300. Works as well as a FLIR and can very quickly help you fault find. Passing high current through a path can even expose plane shorts as you get hotspots.
An IR camera app for your phone (or a mo'spensiv IR video scanner like a FLIR) is another great way to find even a mildly warm component on a board. GREAT vids, Louis!
did this the other day on my motherboard, feels good when you see a professional using the same method as a hobbyist like me.
Using a benchtop DMM that can do 4-wire resistance measurements with a set of 4-wire probes will allow you to make very accurate low-value resistance measurements. I homebrewed a set of 4-wire probes by just soldering an additional sense wire to each probe. This might save you some time by allowing you to tell which side of the inductor was shorted to ground without removing it.
Great and a very good practical approach with lots of non-tehcnical wisedom. Keep on doing what you like in the way you like to do. In relation to the board, i guess this a one of those 21 failure cascading boards.
By using a high resolution bench DMM, you don't even have to remove (larger) inductors to measure where the short is. You just measure resistance in 4 wire mode. That way you don't get the resistance (voltage drop) at your probing points (2 wires for current, 2 to measure the voltage drop over DUT). Since the inductor has a small parasitic resistance and 4 wire measurements are so accurate, you can reliably see which side of the inductor has lower resistance to ground => short
1000 thumbs up for a individual who at least in symbolic means acts 1000 times more enviromentally sustainable than the big ones who are claiming to be at every keynote, talk, etc.
just find a nice decent variable psu, set to correct voltage for the short power rail then wind the current up slowly till either the component that is short blows up big time or smokes or you find a real hot spot, chips generally smoke sometimes pop open but most shorts i get now are from SMD ceramic capacitors, bloody things ! the psu trick works every time for me, 20 years fixing electronics from TVs to £80k Barco projectors !
Louis. I have an Xbox one S that has no power at all. The bluray disc drive had been moved while xbox on, and a small bit of case touched just under it on board. The xbox was ON and instantly turned off. Wont go back on anymore. The internal Power supply does have 3 lines of 12v that work on it. Power connectors on board do show continuity to the ground with a DMM. That's as far as I have and can go. Your videos are right on. Knowledge!!! Let me know if you can help or if it would be a waste of time. Sucks not having a schematic of the xbox one s. Dont even know any of the 12v test points or where the power runs through it. Thanks... Got alot more of your vids to catch up on.. Learning alot. 👍 much respect my brother.
yeah maybe your explaining is a bit challenging but you still ROCK! I appreciate that you try. And, all your other info is exceptional! thks for sharing your expertise.
Arrived here unplanned. With you to the end. Didn't regret my time spent 😁
@ 44:00 life lesson. I needed to hear you say it in your words and understand that I am living how you were. I need to take your advice, I'm at the "If I just keep pushing for completion of things that seem (and might be) impossible, it will be worth it, because look at what I will have if I complete it!" every day and expecting I will be happy and healthy and succeed, rather than making sure I am happy and healthy and succeeding at goals that I know for a fact I can complete and in far less time with less finalized effort. Productivity declines as your health declines, even if your productivity is done while sitting. My health sucks, I'm stressed and defeated feeling and goals that I know are actually possible to complete, are always pushed aside and viewed as second priority. As a result, small progress is made on the potentially impossible mountain sized goals, while miserable the entire time and goals that I could have completed looooong ago that have always been "second priority" just remain unfinished, so when each day is over, I have nothing to be very proud of. I noticed that sometimes when I decide to "give up", that is when I take all the weight off my shoulders and suddenly my brain starts working properly and I can do things much faster with less errors than tons of time I spent when I was committed to not quitting. I may not be making much sense, but the point is that I think you are right, success brings in more success, while diverting all your energy away from things you can succeed at, and putting it all in things that you know are a nightmare and may all be a waste of time, is bad practice. Working on nightmare stuff is fine, but only in moderation and not as the one and only priority in life.
+Jay H By the way, I am referring to solitude Video Game creation from scratch of a game type that the game engine is not designed for, so yeah... it's a nightmare. No need for anyone to suggest any gaming engines to use and reasons to use them. I have already looked at all of them and decided on the one I chose, for a ton of reasons and decided against all others for specific various reasons (per engine). I have troubleshooted a lot of stuff and have a lot of it working, but just like he says at the end of the video, I know there are tons more problems ahead.
Great video. I do the same with my electronics repair business. Sometimes it's better to go out for a beer with friends then spend another hour or two on a difficult dog board. I also probably make minimum wage or less on some of my
repairs, but we still do it because we love electronics repair. Keep up the good work bud.